Add endstop monitor & make pins report pretty

Marlin/Marlin_main.cpp

@@ -148,6 +148,7 @@
  *        The '#' is necessary when calling from within sd files, as it stops buffer prereading
  * M33  - Get the longname version of a path. (Requires LONG_FILENAME_HOST_SUPPORT)
  * M42  - Change pin status via gcode: M42 P<pin> S<value>. LED pin assumed if P is omitted.
+ * M43  - Monitor pins & report changes - report active pins
  * M48  - Measure Z Probe repeatability: M48 P<points> X<pos> Y<pos> V<level> E<engage> L<legs>. (Requires Z_MIN_PROBE_REPEATABILITY_TEST)
  * M75  - Start the print job timer.
  * M76  - Pause the print job timer.
@@ -4675,8 +4676,14 @@ inline void gcode_M42() {
   /**
    * M43: Pin report and debug
    *
+   *      pin report if just M43 with no codes
    *      P<pin> Will read/watch a single pin
    *      W      Watch pins for changes until reboot
+   *      E      toggles endstop monitor
+   *               reports changes to endstops
+   *               toggles LED when endstop changes
+   *               background function (machine continues to operate as normal)
+   *
    */
   inline void gcode_M43() {
     int first_pin = 0, last_pin = DIO_COUNT - 1;
@@ -4721,9 +4728,16 @@ inline void gcode_M42() {
         safe_delay(500);
       }
     }
-    else // single pins report
+    if ( !(code_seen('P') || code_seen('W') || code_seen('E')))   // single pins report
-      for (int8_t pin = first_pin; pin <= last_pin; pin++)
+      for (uint8_t pin = first_pin; pin <= last_pin; pin++)
-        report_pin_state(pin);
+        report_pin_state_extended(pin, code_seen('I') );        // "hidden" option to ignore protected list
+    
+    if (code_seen('E')) {
+      endstop_monitor_flag ^= true;
+      SERIAL_PROTOCOLPGM("endstop monitor ");
+      SERIAL_PROTOCOL(endstop_monitor_flag ? "en" : "dis");
+      SERIAL_PROTOCOLLNPGM("abled");
+    }    
   }
 
 #endif // PINS_DEBUGGING

Marlin/temperature.cpp

@@ -1393,6 +1393,87 @@ void Temperature::set_current_temp_raw() {
   temp_meas_ready = true;
 }
 
+#if ENABLED(PINS_DEBUGGING)
+  /**
+   * monitors endstops & Z probe for changes
+   *
+   * If a change is detected then the LED is toggled and
+   * a message is sent out the serial port
+   *
+   * Yes, we could miss a rapid back & forth change but
+   * that won't matter because this is all manual.
+   *
+   */
+  void endstop_monitor() {
+    static uint16_t old_endstop_bits_local = 0;
+    static uint8_t local_LED_status = 0;
+    if (endstop_monitor_flag) {
+      uint16_t current_endstop_bits_local = 0;
+      #if HAS_X_MIN
+        if (READ(X_MIN_PIN)) current_endstop_bits_local |= _BV(X_MIN);
+        if ((current_endstop_bits_local ^ old_endstop_bits_local) & _BV(X_MIN)) {
+          SERIAL_PROTOCOLPAIR("X_MIN: ", (current_endstop_bits_local & _BV(X_MIN)) ? 1 : 0);
+        }
+      #endif
+      #if HAS_X_MAX
+        if (READ(X_MAX_PIN)) current_endstop_bits_local |= _BV(X_MAX);
+        if ((current_endstop_bits_local ^ old_endstop_bits_local) & _BV(X_MAX)) {
+          SERIAL_PROTOCOLPAIR("   X_MAX: ", (current_endstop_bits_local & _BV(X_MAX)) ? 1 : 0);
+        }
+      #endif
+      #if HAS_Y_MIN
+        if (READ(Y_MIN_PIN)) current_endstop_bits_local |= _BV(Y_MIN);
+        if ((current_endstop_bits_local ^ old_endstop_bits_local) & _BV(Y_MIN)) {
+          SERIAL_PROTOCOLPAIR("   Y_MIN: ", (current_endstop_bits_local & _BV(Y_MIN)) ? 1 : 0);
+        }
+      #endif
+      #if HAS_Y_MAX
+        if (READ(Y_MAX_PIN)) current_endstop_bits_local |= _BV(Y_MAX);
+        if ((current_endstop_bits_local ^ old_endstop_bits_local) & _BV(Y_MAX)) {
+          SERIAL_PROTOCOLPAIR("   Y_MAX: ", (current_endstop_bits_local & _BV(Y_MAX)) ? 1 : 0);
+        }
+      #endif
+      #if HAS_Z_MIN
+        if (READ(Z_MIN_PIN)) current_endstop_bits_local |= _BV(Z_MIN);
+        if ((current_endstop_bits_local ^ old_endstop_bits_local) & _BV(Z_MIN)) {
+          SERIAL_PROTOCOLPAIR("   Z_MIN: ", (current_endstop_bits_local & _BV(Z_MIN)) ? 1 : 0);
+        }
+      #endif
+      #if HAS_Z_MAX
+        if (READ(Z_MAX_PIN)) current_endstop_bits_local |= _BV(Z_MAX);
+        if ((current_endstop_bits_local ^ old_endstop_bits_local) & _BV(Z_MAX)) {
+          SERIAL_PROTOCOLPAIR("   Z_MAX: ", (current_endstop_bits_local & _BV(Z_MAX)) ? 1 : 0);
+        }
+      #endif
+      #if HAS_Z_MIN_PROBE_PIN
+        if (READ(Z_MIN_PROBE_PIN)) current_endstop_bits_local |= _BV(Z_MIN_PROBE);
+        if ((current_endstop_bits_local ^ old_endstop_bits_local) & _BV(Z_MIN_PROBE)) {
+          SERIAL_PROTOCOLPAIR("   PROBE: ", (current_endstop_bits_local & _BV(Z_MIN_PROBE)) ? 1 : 0);
+        }
+      #endif
+      #if HAS_Z2_MIN
+        if (READ(Z2_MIN_PIN)) current_endstop_bits_local |= _BV(Z2_MIN);
+        if ((current_endstop_bits_local ^ old_endstop_bits_local) & _BV(Z2_MIN)) {
+          SERIAL_PROTOCOLPAIR("   Z2_MIN: ", (current_endstop_bits_local & _BV(Z2_MIN)) ? 1 : 0);
+        }
+      #endif
+      #if HAS_Z2_MAX
+        if (READ(Z2_MAX_PIN)) current_endstop_bits_local |= _BV(Z2_MAX);
+        if ((current_endstop_bits_local ^ old_endstop_bits_local) & _BV(Z2_MAX)) {
+          SERIAL_PROTOCOLPAIR("   Z2_MAX: ", (current_endstop_bits_local & _BV(Z2_MAX)) ? 1 : 0);
+        }
+      #endif
+
+      if (current_endstop_bits_local != old_endstop_bits_local) {
+        analogWrite(LED_PIN, local_LED_status );                // toggle LED
+        SERIAL_PROTOCOLPGM("\n\n");                             // make it easy to see the message
+        old_endstop_bits_local = current_endstop_bits_local ;   // get ready for next change
+        local_LED_status  = local_LED_status ? 0 : 255;
+      }
+    }
+  }
+#endif // PINS_DEBUGGING
+
 /**
  * Timer 0 is shared with millies so don't change the prescaler.
  *
@@ -1848,4 +1929,12 @@ void Temperature::isr() {
       }
     }
   #endif //BABYSTEPPING
+  #if ENABLED(PINS_DEBUGGING)
+    extern bool endstop_monitor_flag;
+    // run the endstop monitor at 15Hz
+    static uint8_t endstop_monitor_count = 16;  // offset this check from the others
+    endstop_monitor_count += _BV(1);  //  15 Hz
+    endstop_monitor_count &= 0x7F;
+    if (endstop_monitor_count == 0) endstop_monitor();  // report changes in endstop status
+  #endif
 }