|
|
|
|
@ -23,161 +23,150 @@
|
|
|
|
|
// adapted from I2C/master/master.c example
|
|
|
|
|
// https://www-users.cs.york.ac.uk/~pcc/MCP/HAPR-Course-web/CMSIS/examples/html/master_8c_source.html
|
|
|
|
|
|
|
|
|
|
#ifdef TARGET_LPC1768
|
|
|
|
|
|
|
|
|
|
#ifdef __cplusplus
|
|
|
|
|
extern "C" {
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#if defined(TARGET_LPC1768)
|
|
|
|
|
|
|
|
|
|
#ifdef __cplusplus
|
|
|
|
|
extern "C" {
|
|
|
|
|
#endif
|
|
|
|
|
#include <lpc17xx_i2c.h>
|
|
|
|
|
#include <lpc17xx_pinsel.h>
|
|
|
|
|
#include <lpc17xx_libcfg_default.h>
|
|
|
|
|
|
|
|
|
|
#include <lpc17xx_i2c.h>
|
|
|
|
|
#include <lpc17xx_pinsel.h>
|
|
|
|
|
#include <lpc17xx_libcfg_default.h>
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
// These two routines are exact copies of the lpc17xx_i2c.c routines. Couldn't link to
|
|
|
|
|
// to the lpc17xx_i2c.c routines so had to copy them into this file & rename them.
|
|
|
|
|
|
|
|
|
|
// These two routines are exact copies of the lpc17xx_i2c.c routines. Couldn't link to
|
|
|
|
|
// to the lpc17xx_i2c.c routines so had to copy them into this file & rename them.
|
|
|
|
|
static uint32_t _I2C_Start (LPC_I2C_TypeDef *I2Cx) {
|
|
|
|
|
// Reset STA, STO, SI
|
|
|
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC|I2C_I2CONCLR_STOC|I2C_I2CONCLR_STAC;
|
|
|
|
|
|
|
|
|
|
static uint32_t _I2C_Start (LPC_I2C_TypeDef *I2Cx)
|
|
|
|
|
{
|
|
|
|
|
// Reset STA, STO, SI
|
|
|
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC|I2C_I2CONCLR_STOC|I2C_I2CONCLR_STAC;
|
|
|
|
|
// Enter to Master Transmitter mode
|
|
|
|
|
I2Cx->I2CONSET = I2C_I2CONSET_STA;
|
|
|
|
|
|
|
|
|
|
// Enter to Master Transmitter mode
|
|
|
|
|
I2Cx->I2CONSET = I2C_I2CONSET_STA;
|
|
|
|
|
// Wait for complete
|
|
|
|
|
while (!(I2Cx->I2CONSET & I2C_I2CONSET_SI));
|
|
|
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
|
|
|
|
|
return (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Wait for complete
|
|
|
|
|
while (!(I2Cx->I2CONSET & I2C_I2CONSET_SI));
|
|
|
|
|
static void _I2C_Stop (LPC_I2C_TypeDef *I2Cx) {
|
|
|
|
|
/* Make sure start bit is not active */
|
|
|
|
|
if (I2Cx->I2CONSET & I2C_I2CONSET_STA)
|
|
|
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
|
|
|
|
|
return (I2Cx->I2STAT & I2C_STAT_CODE_BITMASK);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void _I2C_Stop (LPC_I2C_TypeDef *I2Cx)
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
/* Make sure start bit is not active */
|
|
|
|
|
if (I2Cx->I2CONSET & I2C_I2CONSET_STA)
|
|
|
|
|
{
|
|
|
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_STAC;
|
|
|
|
|
}
|
|
|
|
|
I2Cx->I2CONSET = I2C_I2CONSET_STO|I2C_I2CONSET_AA;
|
|
|
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
I2Cx->I2CONSET = I2C_I2CONSET_STO|I2C_I2CONSET_AA;
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
|
|
|
|
I2Cx->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
|
|
|
}
|
|
|
|
|
#define U8G_I2C_OPT_FAST 16 // from u8g.h
|
|
|
|
|
|
|
|
|
|
#define USEDI2CDEV_M 1
|
|
|
|
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
#define I2CDEV_S_ADDR 0x78 // from SSD1306 //actual address is 0x3C - shift left 1 with LSB set to 0 to indicate write
|
|
|
|
|
|
|
|
|
|
#define U8G_I2C_OPT_FAST 16 // from u8g.h
|
|
|
|
|
#define BUFFER_SIZE 0x1 // only do single byte transfers with LCDs
|
|
|
|
|
|
|
|
|
|
#define USEDI2CDEV_M 1
|
|
|
|
|
|
|
|
|
|
#define I2CDEV_S_ADDR 0x78 // from SSD1306 //actual address is 0x3C - shift left 1 with LSB set to 0 to indicate write
|
|
|
|
|
|
|
|
|
|
#define BUFFER_SIZE 0x1 // only do single byte transfers with LCDs
|
|
|
|
|
#if (USEDI2CDEV_M == 0)
|
|
|
|
|
#define I2CDEV_M LPC_I2C0
|
|
|
|
|
#elif (USEDI2CDEV_M == 1)
|
|
|
|
|
#define I2CDEV_M LPC_I2C1
|
|
|
|
|
#elif (USEDI2CDEV_M == 2)
|
|
|
|
|
#define I2CDEV_M LPC_I2C2
|
|
|
|
|
#else
|
|
|
|
|
#error "Master I2C device not defined!"
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#if (USEDI2CDEV_M == 0)
|
|
|
|
|
#define I2CDEV_M LPC_I2C0
|
|
|
|
|
#elif (USEDI2CDEV_M == 1)
|
|
|
|
|
#define I2CDEV_M LPC_I2C1
|
|
|
|
|
#elif (USEDI2CDEV_M == 2)
|
|
|
|
|
#define I2CDEV_M LPC_I2C2
|
|
|
|
|
#else
|
|
|
|
|
#error "Master I2C device not defined!"
|
|
|
|
|
PINSEL_CFG_Type PinCfg;
|
|
|
|
|
I2C_M_SETUP_Type transferMCfg;
|
|
|
|
|
|
|
|
|
|
#define I2C_status (LPC_I2C1->I2STAT & I2C_STAT_CODE_BITMASK)
|
|
|
|
|
|
|
|
|
|
uint8_t u8g_i2c_start(uint8_t sla) { // send slave address and write bit
|
|
|
|
|
// Sometimes TX data ACK or NAK status is returned. That mean the start state didn't
|
|
|
|
|
// happen which means only the value of the slave address was send. Keep looping until
|
|
|
|
|
// the slave address and write bit are actually sent.
|
|
|
|
|
do{
|
|
|
|
|
_I2C_Stop(I2CDEV_M); // output stop state on I2C bus
|
|
|
|
|
_I2C_Start(I2CDEV_M); // output start state on I2C bus
|
|
|
|
|
while ((I2C_status != I2C_I2STAT_M_TX_START)
|
|
|
|
|
&& (I2C_status != I2C_I2STAT_M_TX_RESTART)
|
|
|
|
|
&& (I2C_status != I2C_I2STAT_M_TX_DAT_ACK)
|
|
|
|
|
&& (I2C_status != I2C_I2STAT_M_TX_DAT_NACK)); //wait for start to be asserted
|
|
|
|
|
|
|
|
|
|
LPC_I2C1->I2CONCLR = I2C_I2CONCLR_STAC; // clear start state before tansmitting slave address
|
|
|
|
|
LPC_I2C1->I2DAT = I2CDEV_S_ADDR & I2C_I2DAT_BITMASK; // transmit slave address & write bit
|
|
|
|
|
LPC_I2C1->I2CONSET = I2C_I2CONSET_AA;
|
|
|
|
|
LPC_I2C1->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
|
|
|
while ((I2C_status != I2C_I2STAT_M_TX_SLAW_ACK)
|
|
|
|
|
&& (I2C_status != I2C_I2STAT_M_TX_SLAW_NACK)
|
|
|
|
|
&& (I2C_status != I2C_I2STAT_M_TX_DAT_ACK)
|
|
|
|
|
&& (I2C_status != I2C_I2STAT_M_TX_DAT_NACK)); //wait for slaw to finish
|
|
|
|
|
}while ( (I2C_status == I2C_I2STAT_M_TX_DAT_ACK) || (I2C_status == I2C_I2STAT_M_TX_DAT_NACK));
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void u8g_i2c_init(uint8_t clock_option) {
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Init I2C pin connect
|
|
|
|
|
*/
|
|
|
|
|
PinCfg.OpenDrain = 0;
|
|
|
|
|
PinCfg.Pinmode = 0;
|
|
|
|
|
#if ((USEDI2CDEV_M == 0))
|
|
|
|
|
PinCfg.Funcnum = 1;
|
|
|
|
|
PinCfg.Pinnum = 27;
|
|
|
|
|
PinCfg.Portnum = 0;
|
|
|
|
|
PINSEL_ConfigPin(&PinCfg); // SDA0 / D57 AUX-1
|
|
|
|
|
PinCfg.Pinnum = 28;
|
|
|
|
|
PINSEL_ConfigPin(&PinCfg); // SCL0 / D58 AUX-1
|
|
|
|
|
#endif
|
|
|
|
|
#if ((USEDI2CDEV_M == 1))
|
|
|
|
|
PinCfg.Funcnum = 3;
|
|
|
|
|
PinCfg.Pinnum = 0;
|
|
|
|
|
PinCfg.Portnum = 0;
|
|
|
|
|
PINSEL_ConfigPin(&PinCfg); // SDA1 / D20 SCA
|
|
|
|
|
PinCfg.Pinnum = 1;
|
|
|
|
|
PINSEL_ConfigPin(&PinCfg); // SCL1 / D21 SCL
|
|
|
|
|
#endif
|
|
|
|
|
#if ((USEDI2CDEV_M == 2))
|
|
|
|
|
PinCfg.Funcnum = 2;
|
|
|
|
|
PinCfg.Pinnum = 10;
|
|
|
|
|
PinCfg.Portnum = 0;
|
|
|
|
|
PINSEL_ConfigPin(&PinCfg); // SDA2 / D38 X_ENABLE_PIN
|
|
|
|
|
PinCfg.Pinnum = 11;
|
|
|
|
|
PINSEL_ConfigPin(&PinCfg); // SCL2 / D55 X_DIR_PIN
|
|
|
|
|
#endif
|
|
|
|
|
// Initialize I2C peripheral
|
|
|
|
|
I2C_Init(I2CDEV_M, (clock_option & U8G_I2C_OPT_FAST) ? 400000: 100000); // LCD data rates
|
|
|
|
|
|
|
|
|
|
// Enable Master I2C operation
|
|
|
|
|
I2C_Cmd(I2CDEV_M, I2C_MASTER_MODE, ENABLE);
|
|
|
|
|
|
|
|
|
|
PINSEL_CFG_Type PinCfg;
|
|
|
|
|
I2C_M_SETUP_Type transferMCfg;
|
|
|
|
|
|
|
|
|
|
#define I2C_status (LPC_I2C1->I2STAT & I2C_STAT_CODE_BITMASK)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
uint8_t u8g_i2c_start(uint8_t sla) { // send slave address and write bit
|
|
|
|
|
// Sometimes TX data ACK or NAK status is returned. That mean the start state didn't
|
|
|
|
|
// happen which means only the value of the slave address was send. Keep looping until
|
|
|
|
|
// the slave address and write bit are actually sent.
|
|
|
|
|
do{
|
|
|
|
|
_I2C_Stop(I2CDEV_M); // output stop state on I2C bus
|
|
|
|
|
_I2C_Start(I2CDEV_M); // output start state on I2C bus
|
|
|
|
|
while ((I2C_status != I2C_I2STAT_M_TX_START)
|
|
|
|
|
&& (I2C_status != I2C_I2STAT_M_TX_RESTART)
|
|
|
|
|
&& (I2C_status != I2C_I2STAT_M_TX_DAT_ACK)
|
|
|
|
|
&& (I2C_status != I2C_I2STAT_M_TX_DAT_NACK)); //wait for start to be asserted
|
|
|
|
|
|
|
|
|
|
LPC_I2C1->I2CONCLR = I2C_I2CONCLR_STAC; // clear start state before tansmitting slave address
|
|
|
|
|
LPC_I2C1->I2DAT = I2CDEV_S_ADDR & I2C_I2DAT_BITMASK; // transmit slave address & write bit
|
|
|
|
|
LPC_I2C1->I2CONSET = I2C_I2CONSET_AA;
|
|
|
|
|
LPC_I2C1->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
|
|
|
while ((I2C_status != I2C_I2STAT_M_TX_SLAW_ACK)
|
|
|
|
|
&& (I2C_status != I2C_I2STAT_M_TX_SLAW_NACK)
|
|
|
|
|
&& (I2C_status != I2C_I2STAT_M_TX_DAT_ACK)
|
|
|
|
|
&& (I2C_status != I2C_I2STAT_M_TX_DAT_NACK)); //wait for slaw to finish
|
|
|
|
|
}while ( (I2C_status == I2C_I2STAT_M_TX_DAT_ACK) || (I2C_status == I2C_I2STAT_M_TX_DAT_NACK));
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
u8g_i2c_start(0); // send slave address and write bit
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
volatile extern uint32_t _millis;
|
|
|
|
|
uint8_t u8g_i2c_send_byte(uint8_t data) {
|
|
|
|
|
#define I2C_TIMEOUT 3
|
|
|
|
|
LPC_I2C1->I2DAT = data & I2C_I2DAT_BITMASK; // transmit data
|
|
|
|
|
LPC_I2C1->I2CONSET = I2C_I2CONSET_AA;
|
|
|
|
|
LPC_I2C1->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
|
|
|
uint32_t timeout = _millis + I2C_TIMEOUT;
|
|
|
|
|
while ((I2C_status != I2C_I2STAT_M_TX_DAT_ACK) && (I2C_status != I2C_I2STAT_M_TX_DAT_NACK) && (timeout > _millis)); // wait for xmit to finish
|
|
|
|
|
// had hangs with SH1106 so added time out - have seen temporary screen corruption when this happens
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void u8g_i2c_init(uint8_t clock_option) {
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Init I2C pin connect
|
|
|
|
|
*/
|
|
|
|
|
PinCfg.OpenDrain = 0;
|
|
|
|
|
PinCfg.Pinmode = 0;
|
|
|
|
|
#if ((USEDI2CDEV_M == 0))
|
|
|
|
|
PinCfg.Funcnum = 1;
|
|
|
|
|
PinCfg.Pinnum = 27;
|
|
|
|
|
PinCfg.Portnum = 0;
|
|
|
|
|
PINSEL_ConfigPin(&PinCfg); // SDA0 / D57 AUX-1
|
|
|
|
|
PinCfg.Pinnum = 28;
|
|
|
|
|
PINSEL_ConfigPin(&PinCfg); // SCL0 / D58 AUX-1
|
|
|
|
|
#endif
|
|
|
|
|
#if ((USEDI2CDEV_M == 1))
|
|
|
|
|
PinCfg.Funcnum = 3;
|
|
|
|
|
PinCfg.Pinnum = 0;
|
|
|
|
|
PinCfg.Portnum = 0;
|
|
|
|
|
PINSEL_ConfigPin(&PinCfg); // SDA1 / D20 SCA
|
|
|
|
|
PinCfg.Pinnum = 1;
|
|
|
|
|
PINSEL_ConfigPin(&PinCfg); // SCL1 / D21 SCL
|
|
|
|
|
#endif
|
|
|
|
|
#if ((USEDI2CDEV_M == 2))
|
|
|
|
|
PinCfg.Funcnum = 2;
|
|
|
|
|
PinCfg.Pinnum = 10;
|
|
|
|
|
PinCfg.Portnum = 0;
|
|
|
|
|
PINSEL_ConfigPin(&PinCfg); // SDA2 / D38 X_ENABLE_PIN
|
|
|
|
|
PinCfg.Pinnum = 11;
|
|
|
|
|
PINSEL_ConfigPin(&PinCfg); // SCL2 / D55 X_DIR_PIN
|
|
|
|
|
#endif
|
|
|
|
|
// Initialize I2C peripheral
|
|
|
|
|
I2C_Init(I2CDEV_M, (clock_option & U8G_I2C_OPT_FAST) ? 400000: 100000); // LCD data rates
|
|
|
|
|
|
|
|
|
|
/* Enable Master I2C operation */
|
|
|
|
|
I2C_Cmd(I2CDEV_M, I2C_MASTER_MODE, ENABLE);
|
|
|
|
|
|
|
|
|
|
u8g_i2c_start(0); // send slave address and write bit
|
|
|
|
|
}
|
|
|
|
|
void u8g_i2c_stop(void) {
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
volatile extern uint32_t _millis;
|
|
|
|
|
uint8_t u8g_i2c_send_byte(uint8_t data) {
|
|
|
|
|
#define I2C_TIMEOUT 3
|
|
|
|
|
LPC_I2C1->I2DAT = data & I2C_I2DAT_BITMASK; // transmit data
|
|
|
|
|
LPC_I2C1->I2CONSET = I2C_I2CONSET_AA;
|
|
|
|
|
LPC_I2C1->I2CONCLR = I2C_I2CONCLR_SIC;
|
|
|
|
|
uint32_t timeout = _millis + I2C_TIMEOUT;
|
|
|
|
|
while ((I2C_status != I2C_I2STAT_M_TX_DAT_ACK) && (I2C_status != I2C_I2STAT_M_TX_DAT_NACK) && (timeout > _millis)); // wait for xmit to finish
|
|
|
|
|
// had hangs with SH1106 so added time out - have seen temporary screen corruption when this happens
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void u8g_i2c_stop(void) {
|
|
|
|
|
#ifdef __cplusplus
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#ifdef __cplusplus
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#endif // TARGET_LPC1768
|
|
|
|
|
|
Scott Lahteine
7 years ago
committed by