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1345 lines
38 KiB
C
1345 lines
38 KiB
C
/**********************************************************************
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* $Id$ lpc17xx_i2c.c 2011-03-31
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*//**
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* @file lpc17xx_i2c.c
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* @brief Contains all functions support for I2C firmware
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* library on LPC17xx
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* @version 2.1
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* @date 31. Mar. 2011
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* @author NXP MCU SW Application Team
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*
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* Copyright(C) 2010, NXP Semiconductor
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* All rights reserved.
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*
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***********************************************************************
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* products. This software is supplied "AS IS" without any warranties.
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* NXP Semiconductors assumes no responsibility or liability for the
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* use of the software, conveys no license or title under any patent,
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* copyright, or mask work right to the product. NXP Semiconductors
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* reserves the right to make changes in the software without
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* notification. NXP Semiconductors also make no representation or
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* warranty that such application will be suitable for the specified
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* use without further testing or modification.
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors'
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* relevant copyright in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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**********************************************************************/
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/* Peripheral group ----------------------------------------------------------- */
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/** @addtogroup I2C
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* @{
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*/
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/* Includes ------------------------------------------------------------------- */
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#include "lpc17xx_i2c.h"
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#include "lpc17xx_clkpwr.h"
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#include "lpc17xx_pinsel.h"
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/* If this source file built with example, the LPC17xx FW library configuration
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* file in each example directory ("lpc17xx_libcfg.h") must be included,
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* otherwise the default FW library configuration file must be included instead
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*/
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#ifdef __BUILD_WITH_EXAMPLE__
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#include "lpc17xx_libcfg.h"
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#else
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#include "lpc17xx_libcfg_default.h"
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#endif /* __BUILD_WITH_EXAMPLE__ */
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#ifdef _I2C
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/* Private Types -------------------------------------------------------------- */
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/** @defgroup I2C_Private_Types I2C Private Types
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* @{
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*/
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/**
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* @brief I2C device configuration structure type
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*/
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typedef struct
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{
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uint32_t txrx_setup; /* Transmission setup */
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int32_t dir; /* Current direction phase, 0 - write, 1 - read */
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} I2C_CFG_T;
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/**
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* @}
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*/
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/* Private Variables ---------------------------------------------------------- */
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/**
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* @brief II2C driver data for I2C0, I2C1 and I2C2
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*/
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static I2C_CFG_T i2cdat[3];
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static uint32_t I2C_MasterComplete[3];
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static uint32_t I2C_SlaveComplete[3];
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static uint32_t I2C_MonitorBufferIndex;
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/* Private Functions ---------------------------------------------------------- */
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/* Get I2C number */
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static int32_t I2C_getNum(LPC_I2C_TypeDef *I2Cx);
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/* Generate a start condition on I2C bus (in master mode only) */
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static uint32_t I2C_Start (LPC_I2C_TypeDef *I2Cx);
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/* Generate a stop condition on I2C bus (in master mode only) */
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static void I2C_Stop (LPC_I2C_TypeDef *I2Cx);
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/* I2C send byte subroutine */
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static uint32_t I2C_SendByte (LPC_I2C_TypeDef *I2Cx, uint8_t databyte);
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/* I2C get byte subroutine */
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static uint32_t I2C_GetByte (LPC_I2C_TypeDef *I2Cx, uint8_t *retdat, Bool ack);
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/* I2C set clock (hz) */
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static void I2C_SetClock (LPC_I2C_TypeDef *I2Cx, uint32_t target_clock);
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/*--------------------------------------------------------------------------------*/
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/********************************************************************//**
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* @brief Convert from I2C peripheral to number
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* @param[in] I2Cx: I2C peripheral selected, should be:
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* - LPC_I2C0
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* - LPC_I2C1
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* - LPC_I2C2
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* @return I2C number, could be: 0..2
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*********************************************************************/
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static int32_t I2C_getNum(LPC_I2C_TypeDef *I2Cx){
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if (I2Cx == LPC_I2C0) {
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return (0);
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} else if (I2Cx == LPC_I2C1) {
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return (1);
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} else if (I2Cx == LPC_I2C2) {
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return (2);
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}
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return (-1);
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}
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/********************************************************************//**
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* @brief Generate a start condition on I2C bus (in master mode only)
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* @param[in] I2Cx: I2C peripheral selected, should be:
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* - LPC_I2C0
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* - LPC_I2C1
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* - LPC_I2C2
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* @return value of I2C status register after generate a start condition
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*********************************************************************/
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static uint32_t I2C_Start (LPC_I2C_TypeDef *I2Cx)
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{
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// Reset STA, STO, SI
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I2Cx->I2CONCLR = I2C_I2CONCLR_SIC|I2C_I2CONCLR_STOC|I2C_I2CONCLR_STAC;
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// Enter to Master Transmitter mode
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I2Cx->I2CONSET = I2C_I2CONSET_STA;
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// Wait for complete
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while (!(I2Cx->I2CONSET & I2C_I2CONSET_SI));
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I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
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return (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
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}
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/********************************************************************//**
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* @brief Generate a stop condition on I2C bus (in master mode only)
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* @param[in] I2Cx: I2C peripheral selected, should be:
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* - LPC_I2C0
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* - LPC_I2C1
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* - LPC_I2C2
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* @return None
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*********************************************************************/
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static void I2C_Stop (LPC_I2C_TypeDef *I2Cx)
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{
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/* Make sure start bit is not active */
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if (I2Cx->I2CONSET & I2C_I2CONSET_STA)
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{
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I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
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}
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I2Cx->I2CONSET = I2C_I2CONSET_STO|I2C_I2CONSET_AA;
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I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
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}
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/********************************************************************//**
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* @brief Send a byte
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* @param[in] I2Cx: I2C peripheral selected, should be:
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* - LPC_I2C0
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* - LPC_I2C1
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* - LPC_I2C2
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* @param[in] databyte: number of byte
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* @return value of I2C status register after sending
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*********************************************************************/
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static uint32_t I2C_SendByte (LPC_I2C_TypeDef *I2Cx, uint8_t databyte)
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{
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uint32_t CodeStatus = I2Cx->I2STAT & I2C_STAT_CODE_BITMASK;
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if((CodeStatus != I2C_I2STAT_M_TX_START) &&
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(CodeStatus != I2C_I2STAT_M_TX_RESTART) &&
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(CodeStatus != I2C_I2STAT_M_TX_SLAW_ACK) &&
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(CodeStatus != I2C_I2STAT_M_TX_DAT_ACK) )
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{
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return CodeStatus;
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}
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/* Make sure start bit is not active */
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if (I2Cx->I2CONSET & I2C_I2CONSET_STA)
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{
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I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
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}
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I2Cx->I2DAT = databyte & I2C_I2DAT_BITMASK;
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I2Cx->I2CONSET = I2C_I2CONSET_AA;
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I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
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return (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
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}
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/********************************************************************//**
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* @brief Get a byte
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* @param[in] I2Cx: I2C peripheral selected, should be:
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* - LPC_I2C0
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* - LPC_I2C1
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* - LPC_I2C2
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* @param[out] retdat pointer to return data
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* @param[in] ack assert acknowledge or not, should be: TRUE/FALSE
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* @return value of I2C status register after sending
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*********************************************************************/
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static uint32_t I2C_GetByte (LPC_I2C_TypeDef *I2Cx, uint8_t *retdat, Bool ack)
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{
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*retdat = (uint8_t) (I2Cx->I2DAT & I2C_I2DAT_BITMASK);
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if (ack == TRUE)
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{
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I2Cx->I2CONSET = I2C_I2CONSET_AA;
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}
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else
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{
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I2Cx->I2CONCLR = I2C_I2CONCLR_AAC;
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}
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I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
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return (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
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}
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/*********************************************************************//**
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* @brief Setup clock rate for I2C peripheral
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* @param[in] I2Cx I2C peripheral selected, should be:
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* - LPC_I2C0
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* - LPC_I2C1
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* - LPC_I2C2
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* @param[in] target_clock : clock of SSP (Hz)
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* @return None
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***********************************************************************/
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static void I2C_SetClock (LPC_I2C_TypeDef *I2Cx, uint32_t target_clock)
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{
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uint32_t temp;
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CHECK_PARAM(PARAM_I2Cx(I2Cx));
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// Get PCLK of I2C controller
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if (I2Cx == LPC_I2C0)
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{
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temp = CLKPWR_GetPCLK (CLKPWR_PCLKSEL_I2C0) / target_clock;
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}
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else if (I2Cx == LPC_I2C1)
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{
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temp = CLKPWR_GetPCLK (CLKPWR_PCLKSEL_I2C1) / target_clock;
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}
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else if (I2Cx == LPC_I2C2)
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{
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temp = CLKPWR_GetPCLK (CLKPWR_PCLKSEL_I2C2) / target_clock;
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}
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/* Set the I2C clock value to register */
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I2Cx->I2SCLH = (uint32_t)(temp / 2);
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I2Cx->I2SCLL = (uint32_t)(temp - I2Cx->I2SCLH);
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}
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/* End of Private Functions --------------------------------------------------- */
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/* Public Functions ----------------------------------------------------------- */
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/** @addtogroup I2C_Public_Functions
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* @{
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*/
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/********************************************************************//**
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* @brief Initializes the I2Cx peripheral with specified parameter.
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* @param[in] I2Cx I2C peripheral selected, should be
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* - LPC_I2C0
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* - LPC_I2C1
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* - LPC_I2C2
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* @param[in] clockrate Target clock rate value to initialized I2C
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* peripheral (Hz)
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* @return None
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*********************************************************************/
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void I2C_Init(LPC_I2C_TypeDef *I2Cx, uint32_t clockrate)
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{
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CHECK_PARAM(PARAM_I2Cx(I2Cx));
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if (I2Cx==LPC_I2C0)
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{
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/* Set up clock and power for I2C0 module */
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCI2C0, ENABLE);
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/* As default, peripheral clock for I2C0 module
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* is set to FCCLK / 2 */
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CLKPWR_SetPCLKDiv(CLKPWR_PCLKSEL_I2C0, CLKPWR_PCLKSEL_CCLK_DIV_2);
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}
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else if (I2Cx==LPC_I2C1)
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{
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/* Set up clock and power for I2C1 module */
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCI2C1, ENABLE);
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/* As default, peripheral clock for I2C1 module
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* is set to FCCLK / 2 */
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CLKPWR_SetPCLKDiv(CLKPWR_PCLKSEL_I2C1, CLKPWR_PCLKSEL_CCLK_DIV_2);
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}
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else if (I2Cx==LPC_I2C2)
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{
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/* Set up clock and power for I2C2 module */
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCI2C2, ENABLE);
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/* As default, peripheral clock for I2C2 module
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* is set to FCCLK / 2 */
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CLKPWR_SetPCLKDiv(CLKPWR_PCLKSEL_I2C2, CLKPWR_PCLKSEL_CCLK_DIV_2);
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}
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else {
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// Up-Support this device
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return;
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}
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/* Set clock rate */
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I2C_SetClock(I2Cx, clockrate);
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/* Set I2C operation to default */
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I2Cx->I2CONCLR = (I2C_I2CONCLR_AAC | I2C_I2CONCLR_STAC | I2C_I2CONCLR_I2ENC);
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}
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/*********************************************************************//**
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* @brief De-initializes the I2C peripheral registers to their
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* default reset values.
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* @param[in] I2Cx I2C peripheral selected, should be
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* - LPC_I2C0
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* - LPC_I2C1
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* - LPC_I2C2
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* @return None
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**********************************************************************/
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void I2C_DeInit(LPC_I2C_TypeDef* I2Cx)
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{
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CHECK_PARAM(PARAM_I2Cx(I2Cx));
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/* Disable I2C control */
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I2Cx->I2CONCLR = I2C_I2CONCLR_I2ENC;
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if (I2Cx==LPC_I2C0)
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{
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/* Disable power for I2C0 module */
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCI2C0, DISABLE);
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}
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else if (I2Cx==LPC_I2C1)
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{
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/* Disable power for I2C1 module */
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCI2C1, DISABLE);
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}
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else if (I2Cx==LPC_I2C2)
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{
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/* Disable power for I2C2 module */
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCI2C2, DISABLE);
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}
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}
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/*********************************************************************//**
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* @brief Enable or disable I2C peripheral's operation
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* @param[in] I2Cx I2C peripheral selected, should be
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* - LPC_I2C0
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* - LPC_I2C1
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* - LPC_I2C2
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* @param[in] NewState New State of I2Cx peripheral's operation
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* @return none
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**********************************************************************/
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void I2C_Cmd(LPC_I2C_TypeDef* I2Cx, en_I2C_Mode Mode, FunctionalState NewState)
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{
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CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
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CHECK_PARAM(PARAM_I2Cx(I2Cx));
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if (NewState == ENABLE)
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{
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if(Mode != I2C_SLAVE_MODE)
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I2Cx->I2CONSET = I2C_I2CONSET_I2EN;
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else
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I2Cx->I2CONSET = I2C_I2CONSET_I2EN | I2C_I2CONSET_AA;
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}
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else
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{
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I2Cx->I2CONCLR = I2C_I2CONCLR_I2ENC;
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}
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}
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|
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/*********************************************************************//**
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* @brief Enable/Disable interrupt for I2C peripheral
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* @param[in] I2Cx I2C peripheral selected, should be:
|
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* - LPC_I2C0
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* - LPC_I2C1
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* - LPC_I2C2
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* @param[in] NewState New State of I2C peripheral interrupt in NVIC core
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* should be:
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* - ENABLE: enable interrupt for this I2C peripheral
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* - DISABLE: disable interrupt for this I2C peripheral
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* @return None
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**********************************************************************/
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void I2C_IntCmd (LPC_I2C_TypeDef *I2Cx, Bool NewState)
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{
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if (NewState)
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{
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if(I2Cx == LPC_I2C0)
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{
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NVIC_EnableIRQ(I2C0_IRQn);
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|
}
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else if (I2Cx == LPC_I2C1)
|
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{
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NVIC_EnableIRQ(I2C1_IRQn);
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}
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else if (I2Cx == LPC_I2C2)
|
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{
|
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NVIC_EnableIRQ(I2C2_IRQn);
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}
|
|
}
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else
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{
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if(I2Cx == LPC_I2C0)
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{
|
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NVIC_DisableIRQ(I2C0_IRQn);
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}
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else if (I2Cx == LPC_I2C1)
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{
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NVIC_DisableIRQ(I2C1_IRQn);
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}
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else if (I2Cx == LPC_I2C2)
|
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{
|
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NVIC_DisableIRQ(I2C2_IRQn);
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}
|
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}
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|
return;
|
|
}
|
|
|
|
|
|
/*********************************************************************//**
|
|
* @brief Handle I2C Master states.
|
|
* @param[in] I2Cx I2C peripheral selected, should be:
|
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* - LPC_I2C
|
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* - LPC_I2C1
|
|
* - LPC_I2C2
|
|
* @param[in] CodeStatus I2C state
|
|
* @param[in] TransferCfg Pointer to a I2C_S_SETUP_Type structure that
|
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* contains specified information about the
|
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* configuration for master transfer.
|
|
* @return It can be
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* - I2C_OK
|
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* -I2C_BYTE_RECV
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* -I2C_BYTE_SENT
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* -I2C_SEND_END
|
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* -I2C_RECV_END
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* - I2C_ERR
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* - I2C_NAK_RECV
|
|
**********************************************************************/
|
|
int32_t I2C_MasterHanleStates(LPC_I2C_TypeDef *I2Cx, uint32_t CodeStatus, I2C_M_SETUP_Type *TransferCfg)
|
|
{
|
|
uint8_t *txdat;
|
|
uint8_t *rxdat;
|
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uint8_t tmp;
|
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int32_t Ret = I2C_OK;
|
|
|
|
//get buffer to send/receive
|
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txdat = (uint8_t *) &TransferCfg->tx_data[TransferCfg->tx_count];
|
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rxdat = (uint8_t *) &TransferCfg->rx_data[TransferCfg->rx_count];
|
|
|
|
switch(CodeStatus)
|
|
{
|
|
case I2C_I2STAT_M_TX_START:
|
|
case I2C_I2STAT_M_TX_RESTART:
|
|
//case I2C_I2STAT_M_RX_START:
|
|
//case I2C_I2STAT_M_RX_RESTART
|
|
// Send data first
|
|
if(TransferCfg->tx_count < TransferCfg->tx_length)
|
|
{
|
|
/* Send slave address + WR direction bit = 0 ----------------------------------- */
|
|
I2C_SendByte(I2Cx, (TransferCfg->sl_addr7bit << 1));
|
|
Ret = I2C_BYTE_SENT;
|
|
}
|
|
else if (TransferCfg->rx_count < TransferCfg->rx_length)
|
|
{
|
|
/* Send slave address + RD direction bit = 1 ----------------------------------- */
|
|
I2C_SendByte(I2Cx, ((TransferCfg->sl_addr7bit << 1) | 0x01));
|
|
Ret = I2C_BYTE_SENT;
|
|
}
|
|
break;
|
|
case I2C_I2STAT_M_TX_SLAW_ACK:
|
|
case I2C_I2STAT_M_TX_DAT_ACK:
|
|
|
|
if(TransferCfg->tx_count < TransferCfg->tx_length)
|
|
{
|
|
I2C_SendByte(I2Cx, *txdat);
|
|
|
|
txdat++;
|
|
|
|
TransferCfg->tx_count++;
|
|
|
|
Ret = I2C_BYTE_SENT;
|
|
}
|
|
else
|
|
{
|
|
I2C_Stop(I2Cx);
|
|
|
|
Ret = I2C_SEND_END;
|
|
|
|
}
|
|
break;
|
|
case I2C_I2STAT_M_TX_DAT_NACK:
|
|
I2C_Stop(I2Cx);
|
|
Ret = I2C_SEND_END;
|
|
break;
|
|
case I2C_I2STAT_M_RX_ARB_LOST:
|
|
//case I2C_I2STAT_M_TX_ARB_LOST:
|
|
I2Cx->I2CONSET = I2C_I2CONSET_STA|I2C_I2CONSET_AA;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
break;
|
|
case I2C_I2STAT_M_RX_SLAR_ACK:
|
|
I2Cx->I2CONSET = I2C_I2CONSET_AA;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
|
|
Ret = I2C_BYTE_RECV;
|
|
break;
|
|
case I2C_I2STAT_M_RX_DAT_ACK:
|
|
if (TransferCfg->rx_count <TransferCfg->rx_length)
|
|
{
|
|
if (TransferCfg->rx_count < (TransferCfg->rx_length - 2))
|
|
{
|
|
I2C_GetByte(I2Cx, &tmp, TRUE);
|
|
|
|
Ret = I2C_BYTE_RECV;
|
|
}
|
|
else // the next byte is the last byte, send NACK instead.
|
|
{
|
|
I2C_GetByte(I2Cx, &tmp, FALSE);
|
|
Ret = I2C_BYTE_RECV;
|
|
}
|
|
*rxdat++ = tmp;
|
|
|
|
TransferCfg->rx_count++;
|
|
}
|
|
else
|
|
{
|
|
Ret = I2C_RECV_END;
|
|
}
|
|
|
|
break;
|
|
case I2C_I2STAT_M_RX_DAT_NACK:
|
|
I2C_GetByte(I2Cx, &tmp, FALSE);
|
|
*rxdat++ = tmp;
|
|
TransferCfg->rx_count++;
|
|
I2C_Stop(I2Cx);
|
|
Ret = I2C_RECV_END;
|
|
break;
|
|
case I2C_I2STAT_M_RX_SLAR_NACK:
|
|
case I2C_I2STAT_M_TX_SLAW_NACK:
|
|
case I2C_I2STAT_BUS_ERROR:
|
|
// Send STOP condition
|
|
I2C_Stop(I2Cx);
|
|
Ret = I2C_ERR;
|
|
break;
|
|
/* No status information */
|
|
case I2C_I2STAT_NO_INF:
|
|
default:
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
break;
|
|
}
|
|
|
|
return Ret;
|
|
}
|
|
|
|
/*********************************************************************//**
|
|
* @brief Handle I2C Slave states.
|
|
* @param[in] I2Cx I2C peripheral selected, should be:
|
|
* - LPC_I2C
|
|
* - LPC_I2C1
|
|
* - LPC_I2C2
|
|
* @param[in] CodeStatus I2C state
|
|
* @param[in] TransferCfg Pointer to a I2C_S_SETUP_Type structure that
|
|
* contains specified information about the
|
|
* configuration for master transfer.
|
|
* @return It can be
|
|
* - I2C_OK
|
|
* -I2C_BYTE_RECV
|
|
* -I2C_BYTE_SENT
|
|
* -I2C_SEND_END
|
|
* -I2C_RECV_END
|
|
* - I2C_ERR
|
|
* - I2C_NAK_RECV
|
|
**********************************************************************/
|
|
int32_t I2C_SlaveHanleStates(LPC_I2C_TypeDef *I2Cx, uint32_t CodeStatus, I2C_S_SETUP_Type *TransferCfg)
|
|
{
|
|
|
|
int32_t Ret = I2C_OK;
|
|
uint8_t *txdat;
|
|
uint8_t *rxdat;
|
|
|
|
//get buffer to send/receive
|
|
txdat = (uint8_t *) &TransferCfg->tx_data[TransferCfg->tx_count];
|
|
rxdat = (uint8_t *) &TransferCfg->rx_data[TransferCfg->rx_count];
|
|
|
|
switch (CodeStatus)
|
|
{
|
|
/* Reading phase -------------------------------------------------------- */
|
|
/* Own SLA+R has been received, ACK has been returned */
|
|
case I2C_I2STAT_S_RX_SLAW_ACK:
|
|
|
|
/* General call address has been received, ACK has been returned */
|
|
case I2C_I2STAT_S_RX_GENCALL_ACK:
|
|
I2Cx->I2CONSET = I2C_I2CONSET_AA;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
break;
|
|
/* Arbitration has been lost in Slave Address + R/W bit as bus Master. General Call has
|
|
been received and ACK has been returned.*/
|
|
case I2C_I2STAT_S_RX_ARB_LOST_M_GENCALL:
|
|
I2Cx->I2CONSET = I2C_I2CONSET_AA|I2C_I2CONSET_STA;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
break;
|
|
/* Previously addressed with own SLA;
|
|
* DATA byte has been received;
|
|
* ACK has been returned */
|
|
case I2C_I2STAT_S_RX_ARB_LOST_M_SLA:
|
|
case I2C_I2STAT_S_RX_PRE_SLA_DAT_ACK:
|
|
|
|
/*
|
|
* All data bytes that over-flow the specified receive
|
|
* data length, just ignore them.
|
|
*/
|
|
if ((TransferCfg->rx_count < TransferCfg->rx_length) && (TransferCfg->rx_data != NULL))
|
|
{
|
|
*rxdat++ = (uint8_t)I2Cx->I2DAT;
|
|
|
|
TransferCfg->rx_count++;
|
|
|
|
Ret = I2C_BYTE_RECV;
|
|
}
|
|
if(TransferCfg->rx_count == (TransferCfg->rx_length) ) {
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_AAC|I2C_I2CONCLR_SIC;
|
|
Ret = I2C_BYTE_RECV;
|
|
}
|
|
else {
|
|
I2Cx->I2CONSET = I2C_I2CONSET_AA;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
}
|
|
|
|
break;
|
|
/* DATA has been received, Only the first data byte will be received with ACK. Additional
|
|
data will be received with NOT ACK. */
|
|
case I2C_I2STAT_S_RX_PRE_GENCALL_DAT_ACK:
|
|
if ((TransferCfg->rx_count < TransferCfg->rx_length) && (TransferCfg->rx_data != NULL))
|
|
{
|
|
*rxdat++ = (uint8_t)I2Cx->I2DAT;
|
|
|
|
TransferCfg->rx_count++;
|
|
|
|
Ret = I2C_BYTE_RECV;
|
|
}
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_AAC|I2C_I2CONCLR_SIC;
|
|
break;
|
|
|
|
/* Writing phase -------------------------------------------------------- */
|
|
/* Own SLA+R has been received, ACK has been returned */
|
|
case I2C_I2STAT_S_TX_SLAR_ACK:
|
|
|
|
/* Data has been transmitted, ACK has been received */
|
|
case I2C_I2STAT_S_TX_DAT_ACK:
|
|
/*
|
|
* All data bytes that over-flow the specified receive
|
|
* data length, just ignore them.
|
|
*/
|
|
if ((TransferCfg->tx_count < TransferCfg->tx_length) && (TransferCfg->tx_data != NULL))
|
|
{
|
|
I2Cx->I2DAT = *txdat++;
|
|
|
|
TransferCfg->tx_count++;
|
|
|
|
Ret = I2C_BYTE_SENT;
|
|
}
|
|
|
|
I2Cx->I2CONSET = I2C_I2CONSET_AA;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
break;
|
|
/* Arbitration lost in Slave Address and R/W bit as bus Master. Own Slave Address + Read
|
|
has been received, ACK has been returned. */
|
|
case I2C_I2STAT_S_TX_ARB_LOST_M_SLA:
|
|
if ((TransferCfg->tx_count < TransferCfg->tx_length) && (TransferCfg->tx_data != NULL))
|
|
{
|
|
I2Cx->I2DAT = *txdat++;
|
|
|
|
TransferCfg->tx_count++;
|
|
|
|
Ret = I2C_BYTE_SENT;
|
|
}
|
|
I2Cx->I2CONSET = I2C_I2CONSET_AA|I2C_I2CONSET_STA;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
break;
|
|
|
|
case I2C_I2STAT_S_TX_LAST_DAT_ACK:
|
|
/* Data has been transmitted, NACK has been received,
|
|
* that means there's no more data to send, exit now */
|
|
/*
|
|
* Note: Don't wait for stop event since in slave transmit mode,
|
|
* since there no proof lets us know when a stop signal has been received
|
|
* on slave side.
|
|
*/
|
|
case I2C_I2STAT_S_TX_DAT_NACK:
|
|
I2Cx->I2CONSET = I2C_I2CONSET_AA;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
Ret = I2C_SEND_END;
|
|
break;
|
|
|
|
/* Previously addressed with own SLA;
|
|
* DATA byte has been received;
|
|
* NOT ACK has been returned */
|
|
case I2C_I2STAT_S_RX_PRE_SLA_DAT_NACK:
|
|
|
|
/* DATA has been received, NOT ACK has been returned */
|
|
case I2C_I2STAT_S_RX_PRE_GENCALL_DAT_NACK:
|
|
I2Cx->I2CONSET = I2C_I2CONSET_AA;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
Ret = I2C_RECV_END;
|
|
break;
|
|
|
|
/*
|
|
* Note that: Return code only let us know a stop condition mixed
|
|
* with a repeat start condition in the same code value.
|
|
* So we should provide a time-out. In case this is really a stop
|
|
* condition, this will return back after time out condition. Otherwise,
|
|
* next session that is slave receive data will be completed.
|
|
*/
|
|
|
|
/* A Stop or a repeat start condition */
|
|
case I2C_I2STAT_S_RX_STA_STO_SLVREC_SLVTRX:
|
|
I2Cx->I2CONSET = I2C_I2CONSET_AA;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
Ret = I2C_STA_STO_RECV;
|
|
break;
|
|
|
|
/* No status information */
|
|
case I2C_I2STAT_NO_INF:
|
|
/* Other status must be captured */
|
|
default:
|
|
I2Cx->I2CONSET = I2C_I2CONSET_AA;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
break;
|
|
|
|
}
|
|
|
|
return Ret;
|
|
}
|
|
/*********************************************************************//**
|
|
* @brief General Master Interrupt handler for I2C peripheral
|
|
* @param[in] I2Cx I2C peripheral selected, should be:
|
|
* - LPC_I2C
|
|
* - LPC_I2C1
|
|
* - LPC_I2C2
|
|
* @return None
|
|
**********************************************************************/
|
|
void I2C_MasterHandler(LPC_I2C_TypeDef *I2Cx)
|
|
{
|
|
uint32_t i2cId = I2C_getNum(I2Cx);
|
|
uint8_t returnCode;
|
|
I2C_M_SETUP_Type *txrx_setup;
|
|
int32_t Ret = I2C_OK;
|
|
|
|
txrx_setup = (I2C_M_SETUP_Type *) i2cdat[i2cId].txrx_setup;
|
|
|
|
returnCode = (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
|
|
|
|
// Save current status
|
|
txrx_setup->status = returnCode;
|
|
|
|
Ret = I2C_MasterHanleStates(I2Cx, returnCode, txrx_setup);
|
|
|
|
if(I2C_CheckError(Ret))
|
|
{
|
|
if(txrx_setup->retransmissions_count < txrx_setup->retransmissions_max)
|
|
{
|
|
// Retry
|
|
txrx_setup->retransmissions_count ++;
|
|
txrx_setup->tx_count = 0;
|
|
txrx_setup->rx_count = 0;
|
|
// Reset STA, STO, SI
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC|I2C_I2CONCLR_STOC|I2C_I2CONCLR_STAC;
|
|
I2Cx->I2CONSET = I2C_I2CONSET_STA;
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
goto s_int_end;
|
|
}
|
|
}
|
|
else if (Ret & I2C_SEND_END)
|
|
{
|
|
// If no need to wait for data from Slave
|
|
if(txrx_setup->rx_count >= (txrx_setup->rx_length))
|
|
{
|
|
goto s_int_end;
|
|
}
|
|
else // Start to wait for data from Slave
|
|
{
|
|
// Reset STA, STO, SI
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC|I2C_I2CONCLR_STOC|I2C_I2CONCLR_STAC;
|
|
I2Cx->I2CONSET = I2C_I2CONSET_STA;
|
|
return;
|
|
}
|
|
}
|
|
else if (Ret & I2C_RECV_END)
|
|
{
|
|
goto s_int_end;
|
|
}
|
|
else
|
|
{
|
|
return;
|
|
}
|
|
|
|
s_int_end:
|
|
// Disable interrupt
|
|
I2C_IntCmd(I2Cx, FALSE);
|
|
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_AAC | I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC;
|
|
|
|
I2C_MasterComplete[i2cId] = TRUE;
|
|
|
|
}
|
|
|
|
|
|
/*********************************************************************//**
|
|
* @brief General Slave Interrupt handler for I2C peripheral
|
|
* @param[in] I2Cx I2C peripheral selected, should be:
|
|
* - LPC_I2C0
|
|
* - LPC_I2C1
|
|
* - LPC_I2C2
|
|
* @return None
|
|
**********************************************************************/
|
|
void I2C_SlaveHandler (LPC_I2C_TypeDef *I2Cx)
|
|
{
|
|
uint32_t i2cId = I2C_getNum(I2Cx);
|
|
uint8_t returnCode;
|
|
I2C_S_SETUP_Type *txrx_setup;
|
|
uint32_t timeout;
|
|
int32_t Ret = I2C_OK;
|
|
|
|
txrx_setup = (I2C_S_SETUP_Type *) i2cdat[i2cId].txrx_setup;
|
|
|
|
handle_state:
|
|
|
|
returnCode = (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
|
|
// Save current status
|
|
txrx_setup->status = returnCode;
|
|
|
|
|
|
Ret = I2C_SlaveHanleStates(I2Cx, returnCode, txrx_setup);
|
|
|
|
if(I2C_CheckError(Ret))
|
|
{
|
|
goto s_int_end;
|
|
}
|
|
else if (Ret & I2C_STA_STO_RECV)
|
|
{
|
|
// Temporally lock the interrupt for timeout condition
|
|
I2C_IntCmd(I2Cx, FALSE);
|
|
// enable time out
|
|
timeout = I2C_SLAVE_TIME_OUT;
|
|
while(1)
|
|
{
|
|
if (I2Cx->I2CONSET & I2C_I2CONSET_SI)
|
|
{
|
|
// re-Enable interrupt
|
|
I2C_IntCmd(I2Cx, TRUE);
|
|
goto handle_state;
|
|
}
|
|
else
|
|
{
|
|
timeout--;
|
|
if (timeout == 0)
|
|
{
|
|
// timeout occur, it's really a stop condition
|
|
txrx_setup->status |= I2C_SETUP_STATUS_DONE;
|
|
goto s_int_end;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else if(Ret &I2C_SEND_END)
|
|
{
|
|
goto s_int_end;
|
|
}
|
|
else
|
|
{
|
|
return;
|
|
}
|
|
|
|
s_int_end:
|
|
// Disable interrupt
|
|
I2C_IntCmd(I2Cx, FALSE);
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_AAC | I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC;
|
|
|
|
I2C_SlaveComplete[i2cId] = TRUE;
|
|
}
|
|
|
|
/*********************************************************************//**
|
|
* @brief Transmit and Receive data in master mode
|
|
* @param[in] I2Cx I2C peripheral selected, should be:
|
|
* - LPC_I2C0
|
|
* - LPC_I2C1
|
|
* - LPC_I2C2
|
|
* @param[in] TransferCfg Pointer to a I2C_M_SETUP_Type structure that
|
|
* contains specified information about the
|
|
* configuration for master transfer.
|
|
* @param[in] Opt a I2C_TRANSFER_OPT_Type type that selected for
|
|
* interrupt or polling mode.
|
|
* @return SUCCESS or ERROR
|
|
*
|
|
* Note:
|
|
* - In case of using I2C to transmit data only, either transmit length set to 0
|
|
* or transmit data pointer set to NULL.
|
|
* - In case of using I2C to receive data only, either receive length set to 0
|
|
* or receive data pointer set to NULL.
|
|
* - In case of using I2C to transmit followed by receive data, transmit length,
|
|
* transmit data pointer, receive length and receive data pointer should be set
|
|
* corresponding.
|
|
**********************************************************************/
|
|
Status I2C_MasterTransferData(LPC_I2C_TypeDef *I2Cx, I2C_M_SETUP_Type *TransferCfg, \
|
|
I2C_TRANSFER_OPT_Type Opt)
|
|
{
|
|
uint32_t i2cId = I2C_getNum(I2Cx); uint32_t CodeStatus;
|
|
int32_t Ret = I2C_OK;
|
|
|
|
// Reset I2C setup value to default state
|
|
TransferCfg->tx_count = 0;
|
|
TransferCfg->rx_count = 0;
|
|
TransferCfg->status = 0;
|
|
|
|
if (Opt == I2C_TRANSFER_POLLING)
|
|
{
|
|
/* First Start condition -------------------------------------------------------------- */
|
|
TransferCfg->retransmissions_count = 0;
|
|
retry:
|
|
// Reset I2C setup value to default state
|
|
TransferCfg->tx_count = 0;
|
|
TransferCfg->rx_count = 0;
|
|
|
|
// Start command
|
|
CodeStatus = I2C_Start(I2Cx);
|
|
|
|
while(1) // send data first and then receive data from Slave.
|
|
{
|
|
Ret = I2C_MasterHanleStates(I2Cx, CodeStatus, TransferCfg);
|
|
if(I2C_CheckError(Ret))
|
|
{
|
|
TransferCfg->retransmissions_count++;
|
|
if (TransferCfg->retransmissions_count > TransferCfg->retransmissions_max){
|
|
// save status
|
|
TransferCfg->status = CodeStatus | I2C_SETUP_STATUS_NOACKF;
|
|
goto error;
|
|
} else {
|
|
goto retry;
|
|
}
|
|
}
|
|
else if( (Ret & I2C_BYTE_SENT) ||
|
|
(Ret & I2C_BYTE_RECV))
|
|
{
|
|
// Wait for sending ends
|
|
while (!(I2Cx->I2CONSET & I2C_I2CONSET_SI));
|
|
}
|
|
else if (Ret & I2C_SEND_END) // already send all data
|
|
{
|
|
// If no need to wait for data from Slave
|
|
if(TransferCfg->rx_count >= (TransferCfg->rx_length))
|
|
{
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
I2C_Start(I2Cx);
|
|
}
|
|
}
|
|
else if (Ret & I2C_RECV_END) // already receive all data
|
|
{
|
|
break;
|
|
}
|
|
CodeStatus = I2Cx->I2STAT & I2C_STAT_CODE_BITMASK;
|
|
}
|
|
return SUCCESS;
|
|
error:
|
|
return ERROR;
|
|
}
|
|
|
|
else if (Opt == I2C_TRANSFER_INTERRUPT)
|
|
{
|
|
// Setup tx_rx data, callback and interrupt handler
|
|
i2cdat[i2cId].txrx_setup = (uint32_t) TransferCfg;
|
|
|
|
// Set direction phase, write first
|
|
i2cdat[i2cId].dir = 0;
|
|
|
|
/* First Start condition -------------------------------------------------------------- */
|
|
// Reset STA, STO, SI
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC|I2C_I2CONCLR_STOC|I2C_I2CONCLR_STAC;
|
|
I2Cx->I2CONSET = I2C_I2CONSET_STA;
|
|
|
|
I2C_IntCmd(I2Cx, TRUE);
|
|
|
|
return (SUCCESS);
|
|
}
|
|
|
|
return ERROR;
|
|
}
|
|
|
|
/*********************************************************************//**
|
|
* @brief Receive and Transmit data in slave mode
|
|
* @param[in] I2Cx I2C peripheral selected, should be
|
|
* - LPC_I2C0
|
|
* - LPC_I2C1
|
|
* - LPC_I2C2
|
|
* @param[in] TransferCfg Pointer to a I2C_S_SETUP_Type structure that
|
|
* contains specified information about the
|
|
* configuration for master transfer.
|
|
* @param[in] Opt I2C_TRANSFER_OPT_Type type that selected for
|
|
* interrupt or polling mode.
|
|
* @return SUCCESS or ERROR
|
|
*
|
|
* Note:
|
|
* The mode of slave's operation depends on the command sent from master on
|
|
* the I2C bus. If the master send a SLA+W command, this sub-routine will
|
|
* use receive data length and receive data pointer. If the master send a SLA+R
|
|
* command, this sub-routine will use transmit data length and transmit data
|
|
* pointer.
|
|
* If the master issue an repeat start command or a stop command, the slave will
|
|
* enable an time out condition, during time out condition, if there's no activity
|
|
* on I2C bus, the slave will exit, otherwise (i.e. the master send a SLA+R/W),
|
|
* the slave then switch to relevant operation mode. The time out should be used
|
|
* because the return status code can not show difference from stop and repeat
|
|
* start command in slave operation.
|
|
* In case of the expected data length from master is greater than data length
|
|
* that slave can support:
|
|
* - In case of reading operation (from master): slave will return I2C_I2DAT_IDLE_CHAR
|
|
* value.
|
|
* - In case of writing operation (from master): slave will ignore remain data from master.
|
|
**********************************************************************/
|
|
Status I2C_SlaveTransferData(LPC_I2C_TypeDef *I2Cx, I2C_S_SETUP_Type *TransferCfg, \
|
|
I2C_TRANSFER_OPT_Type Opt)
|
|
{
|
|
int32_t Ret = I2C_OK;
|
|
|
|
uint32_t CodeStatus;
|
|
uint32_t timeout;
|
|
int32_t time_en;
|
|
uint32_t i2cId = I2C_getNum(I2Cx);
|
|
// Reset I2C setup value to default state
|
|
TransferCfg->tx_count = 0;
|
|
TransferCfg->rx_count = 0;
|
|
TransferCfg->status = 0;
|
|
|
|
// Polling option
|
|
if (Opt == I2C_TRANSFER_POLLING)
|
|
{
|
|
/* Set AA bit to ACK command on I2C bus */
|
|
I2Cx->I2CONSET = I2C_I2CONSET_AA;
|
|
|
|
/* Clear SI bit to be ready ... */
|
|
I2Cx->I2CONCLR = (I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC|I2C_I2CONCLR_STOC);
|
|
|
|
time_en = 0;
|
|
timeout = 0;
|
|
|
|
while (1)
|
|
{
|
|
/* Check SI flag ready */
|
|
if (I2Cx->I2CONSET & I2C_I2CONSET_SI)
|
|
{
|
|
time_en = 0;
|
|
|
|
CodeStatus = (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
|
|
|
|
Ret = I2C_SlaveHanleStates(I2Cx, CodeStatus, TransferCfg);
|
|
if(I2C_CheckError(Ret))
|
|
{
|
|
goto s_error;
|
|
}
|
|
else if(Ret & I2C_STA_STO_RECV)
|
|
{
|
|
time_en = 1;
|
|
timeout = 0;
|
|
}
|
|
else if (Ret & I2C_SEND_END)
|
|
{
|
|
goto s_end_stage;
|
|
}
|
|
}
|
|
else if (time_en)
|
|
{
|
|
if (timeout++ > I2C_SLAVE_TIME_OUT)
|
|
{
|
|
// it's really a stop condition, goto end stage
|
|
goto s_end_stage;
|
|
}
|
|
}
|
|
}
|
|
|
|
s_end_stage:
|
|
/* Clear AA bit to disable ACK on I2C bus */
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_AAC;
|
|
|
|
// Check if there's no error during operation
|
|
// Update status
|
|
TransferCfg->status = CodeStatus | I2C_SETUP_STATUS_DONE;
|
|
return SUCCESS;
|
|
|
|
s_error:
|
|
/* Clear AA bit to disable ACK on I2C bus */
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_AAC;
|
|
|
|
// Update status
|
|
TransferCfg->status = CodeStatus;
|
|
return ERROR;
|
|
}
|
|
|
|
else if (Opt == I2C_TRANSFER_INTERRUPT)
|
|
{
|
|
// Setup tx_rx data, callback and interrupt handler
|
|
i2cdat[i2cId].txrx_setup = (uint32_t) TransferCfg;
|
|
|
|
// Set direction phase, read first
|
|
i2cdat[i2cId].dir = 1;
|
|
|
|
// Enable AA
|
|
I2Cx->I2CONSET = I2C_I2CONSET_AA;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC;
|
|
I2C_IntCmd(I2Cx, TRUE);
|
|
|
|
return (SUCCESS);
|
|
}
|
|
|
|
return ERROR;
|
|
}
|
|
|
|
/*********************************************************************//**
|
|
* @brief Set Own slave address in I2C peripheral corresponding to
|
|
* parameter specified in OwnSlaveAddrConfigStruct.
|
|
* @param[in] I2Cx I2C peripheral selected, should be
|
|
* - LPC_I2C0
|
|
* - LPC_I2C1
|
|
* - LPC_I2C2
|
|
* @param[in] OwnSlaveAddrConfigStruct Pointer to a I2C_OWNSLAVEADDR_CFG_Type
|
|
* structure that contains the configuration information for the
|
|
* specified I2C slave address.
|
|
* @return None
|
|
**********************************************************************/
|
|
void I2C_SetOwnSlaveAddr(LPC_I2C_TypeDef *I2Cx, I2C_OWNSLAVEADDR_CFG_Type *OwnSlaveAddrConfigStruct)
|
|
{
|
|
uint32_t tmp;
|
|
CHECK_PARAM(PARAM_I2Cx(I2Cx));
|
|
CHECK_PARAM(PARAM_I2C_SLAVEADDR_CH(OwnSlaveAddrConfigStruct->SlaveAddrChannel));
|
|
CHECK_PARAM(PARAM_FUNCTIONALSTATE(OwnSlaveAddrConfigStruct->GeneralCallState));
|
|
|
|
tmp = (((uint32_t)(OwnSlaveAddrConfigStruct->SlaveAddr_7bit << 1)) \
|
|
| ((OwnSlaveAddrConfigStruct->GeneralCallState == ENABLE) ? 0x01 : 0x00))& I2C_I2ADR_BITMASK;
|
|
switch (OwnSlaveAddrConfigStruct->SlaveAddrChannel)
|
|
{
|
|
case 0:
|
|
I2Cx->I2ADR0 = tmp;
|
|
I2Cx->I2MASK0 = I2C_I2MASK_MASK((uint32_t) \
|
|
(OwnSlaveAddrConfigStruct->SlaveAddrMaskValue));
|
|
break;
|
|
case 1:
|
|
I2Cx->I2ADR1 = tmp;
|
|
I2Cx->I2MASK1 = I2C_I2MASK_MASK((uint32_t) \
|
|
(OwnSlaveAddrConfigStruct->SlaveAddrMaskValue));
|
|
break;
|
|
case 2:
|
|
I2Cx->I2ADR2 = tmp;
|
|
I2Cx->I2MASK2 = I2C_I2MASK_MASK((uint32_t) \
|
|
(OwnSlaveAddrConfigStruct->SlaveAddrMaskValue));
|
|
break;
|
|
case 3:
|
|
I2Cx->I2ADR3 = tmp;
|
|
I2Cx->I2MASK3 = I2C_I2MASK_MASK((uint32_t) \
|
|
(OwnSlaveAddrConfigStruct->SlaveAddrMaskValue));
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*********************************************************************//**
|
|
* @brief Configures functionality in I2C monitor mode
|
|
* @param[in] I2Cx I2C peripheral selected, should be
|
|
* - LPC_I2C0
|
|
* - LPC_I2C1
|
|
* - LPC_I2C2
|
|
* @param[in] MonitorCfgType Monitor Configuration type, should be:
|
|
* - I2C_MONITOR_CFG_SCL_OUTPUT: I2C module can 'stretch'
|
|
* the clock line (hold it low) until it has had time to
|
|
* respond to an I2C interrupt.
|
|
* - I2C_MONITOR_CFG_MATCHALL: When this bit is set to '1'
|
|
* and the I2C is in monitor mode, an interrupt will be
|
|
* generated on ANY address received.
|
|
* @param[in] NewState New State of this function, should be:
|
|
* - ENABLE: Enable this function.
|
|
* - DISABLE: Disable this function.
|
|
* @return None
|
|
**********************************************************************/
|
|
void I2C_MonitorModeConfig(LPC_I2C_TypeDef *I2Cx, uint32_t MonitorCfgType, FunctionalState NewState)
|
|
{
|
|
CHECK_PARAM(PARAM_I2Cx(I2Cx));
|
|
CHECK_PARAM(PARAM_I2C_MONITOR_CFG(MonitorCfgType));
|
|
CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
|
|
|
|
if (NewState == ENABLE)
|
|
{
|
|
I2Cx->MMCTRL |= MonitorCfgType;
|
|
}
|
|
else
|
|
{
|
|
I2Cx->MMCTRL &= (~MonitorCfgType) & I2C_I2MMCTRL_BITMASK;
|
|
}
|
|
}
|
|
|
|
|
|
/*********************************************************************//**
|
|
* @brief Enable/Disable I2C monitor mode
|
|
* @param[in] I2Cx I2C peripheral selected, should be
|
|
* - LPC_I2C0
|
|
* - LPC_I2C1
|
|
* - LPC_I2C2
|
|
* @param[in] NewState New State of this function, should be:
|
|
* - ENABLE: Enable monitor mode.
|
|
* - DISABLE: Disable monitor mode.
|
|
* @return None
|
|
**********************************************************************/
|
|
void I2C_MonitorModeCmd(LPC_I2C_TypeDef *I2Cx, FunctionalState NewState)
|
|
{
|
|
CHECK_PARAM(PARAM_I2Cx(I2Cx));
|
|
CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
|
|
|
|
if (NewState == ENABLE)
|
|
{
|
|
I2Cx->MMCTRL |= I2C_I2MMCTRL_MM_ENA;
|
|
I2Cx->I2CONSET = I2C_I2CONSET_AA;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC;
|
|
}
|
|
else
|
|
{
|
|
I2Cx->MMCTRL &= (~I2C_I2MMCTRL_MM_ENA) & I2C_I2MMCTRL_BITMASK;
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC | I2C_I2CONCLR_STAC | I2C_I2CONCLR_AAC;
|
|
}
|
|
I2C_MonitorBufferIndex = 0;
|
|
}
|
|
|
|
|
|
/*********************************************************************//**
|
|
* @brief Get data from I2C data buffer in monitor mode.
|
|
* @param[in] I2Cx I2C peripheral selected, should be
|
|
* - LPC_I2C0
|
|
* - LPC_I2C1
|
|
* - LPC_I2C2
|
|
* @return None
|
|
* Note: In monitor mode, the I2C module may lose the ability to stretch
|
|
* the clock (stall the bus) if the ENA_SCL bit is not set. This means that
|
|
* the processor will have a limited amount of time to read the contents of
|
|
* the data received on the bus. If the processor reads the I2DAT shift
|
|
* register, as it ordinarily would, it could have only one bit-time to
|
|
* respond to the interrupt before the received data is overwritten by
|
|
* new data.
|
|
**********************************************************************/
|
|
uint8_t I2C_MonitorGetDatabuffer(LPC_I2C_TypeDef *I2Cx)
|
|
{
|
|
CHECK_PARAM(PARAM_I2Cx(I2Cx));
|
|
return ((uint8_t)(I2Cx->I2DATA_BUFFER));
|
|
}
|
|
|
|
/*********************************************************************//**
|
|
* @brief Get data from I2C data buffer in monitor mode.
|
|
* @param[in] I2Cx I2C peripheral selected, should be
|
|
* - LPC_I2C0
|
|
* - LPC_I2C1
|
|
* - LPC_I2C2
|
|
* @return None
|
|
* Note: In monitor mode, the I2C module may lose the ability to stretch
|
|
* the clock (stall the bus) if the ENA_SCL bit is not set. This means that
|
|
* the processor will have a limited amount of time to read the contents of
|
|
* the data received on the bus. If the processor reads the I2DAT shift
|
|
* register, as it ordinarily would, it could have only one bit-time to
|
|
* respond to the interrupt before the received data is overwritten by
|
|
* new data.
|
|
**********************************************************************/
|
|
BOOL_8 I2C_MonitorHandler(LPC_I2C_TypeDef *I2Cx, uint8_t *buffer, uint32_t size)
|
|
{
|
|
BOOL_8 ret=FALSE;
|
|
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
|
|
buffer[I2C_MonitorBufferIndex] = (uint8_t)(I2Cx->I2DATA_BUFFER);
|
|
I2C_MonitorBufferIndex++;
|
|
if(I2C_MonitorBufferIndex >= size)
|
|
{
|
|
ret = TRUE;
|
|
}
|
|
return ret;
|
|
}
|
|
/*********************************************************************//**
|
|
* @brief Get status of Master Transfer
|
|
* @param[in] I2Cx I2C peripheral selected, should be:
|
|
* - LPC_I2C0
|
|
* - LPC_I2C1
|
|
* - LPC_I2C2
|
|
* @return Master transfer status, could be:
|
|
* - TRUE master transfer completed
|
|
* - FALSE master transfer have not completed yet
|
|
**********************************************************************/
|
|
uint32_t I2C_MasterTransferComplete(LPC_I2C_TypeDef *I2Cx)
|
|
{
|
|
uint32_t retval, tmp;
|
|
tmp = I2C_getNum(I2Cx);
|
|
retval = I2C_MasterComplete[tmp];
|
|
I2C_MasterComplete[tmp] = FALSE;
|
|
return retval;
|
|
}
|
|
|
|
/*********************************************************************//**
|
|
* @brief Get status of Slave Transfer
|
|
* @param[in] I2Cx I2C peripheral selected, should be:
|
|
* - LPC_I2C0
|
|
* - LPC_I2C1
|
|
* - LPC_I2C2
|
|
* @return Complete status, could be: TRUE/FALSE
|
|
**********************************************************************/
|
|
uint32_t I2C_SlaveTransferComplete(LPC_I2C_TypeDef *I2Cx)
|
|
{
|
|
uint32_t retval, tmp;
|
|
tmp = I2C_getNum(I2Cx);
|
|
retval = I2C_SlaveComplete[tmp];
|
|
I2C_SlaveComplete[tmp] = FALSE;
|
|
return retval;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#endif /* _I2C */
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
/* --------------------------------- End Of File ------------------------------ */
|