Implemented M155 and M156, a generic TWI/I2C interface for Marlin

2016-03-26 23:25:28 +00:00
parent 843aa90b5a
commit dd3a06a95a
19 changed files with 809 additions and 0 deletions
--- a/Marlin/twibus.cpp
+++ b/Marlin/twibus.cpp
@ -0,0 +1,104 @@
+/*
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "Marlin.h"
+
+#if ENABLED(EXPERIMENTAL_I2CBUS)
+
+#include "twibus.h"
+
+#include <Wire.h>
+
+TWIBus::twibus() {
+  Wire.begin(); // We use no address so we will join the BUS as the master
+  this->reset();
+}
+
+void TWIBus::reset() {
+  this->addr = 0;
+  this->buffer_s = 0;
+  this->buffer[0] = 0x00;
+}
+
+void TWIBus::address(uint8_t addr) {
+  this->addr = addr;
+
+  if (DEBUGGING(INFO)) {
+    SERIAL_ECHOPAIR("TWIBus::sendto: ", this->addr);
+    SERIAL_EOL;
+  }
+}
+
+void TWIBus::addbyte(char c) {
+  if (buffer_s >= sizeof(this->buffer)) return;
+  this->buffer[this->buffer_s++] = c;
+
+  if (DEBUGGING(INFO)) {
+    SERIAL_ECHOPAIR("TWIBus::addbyte: ", this->buffer[this->buffer_s -1]);
+    SERIAL_EOL;
+  }
+}
+
+void TWIBus::send() {
+  if (!this->addr) return;
+  if (DEBUGGING(INFO)) SERIAL_ECHOLNPGM("TWIBus::send()");
+
+  Wire.beginTransmission(this->addr);
+  Wire.write(this->buffer, this->buffer_s);
+  Wire.endTransmission();
+
+    // Reset the buffer after sending the data
+  this->reset();
+}
+
+void TWIBus::reqbytes(uint8_t bytes) {
+  if (!this->addr) return;
+  if (DEBUGGING(INFO)) {
+    SERIAL_ECHOPAIR("TWIBus::reqbytes(): ", bytes);
+    SERIAL_EOL;
+  }
+
+  millis_t t = millis();
+  Wire.requestFrom(this->addr, bytes);
+
+    // requestFrom() is a blocking function
+  while (Wire.available() < bytes) {
+    if (millis() - t >= this->timeout) break;
+    else continue;
+  }
+
+  SERIAL_ECHO_START;
+  SERIAL_ECHOPAIR("i2c-reply: from:", this->addr);
+  SERIAL_ECHOPAIR(" bytes:", Wire.available());
+  SERIAL_ECHOPGM (" data:");
+
+    // Protect against buffer overflows if the number of received bytes
+    // is less than the number of requested bytes
+  uint8_t wba = Wire.available();
+  for (int i = 0; i < wba; i++) SERIAL_CHAR(Wire.read());
+  SERIAL_EOL;
+
+  // Reset the buffer after sending the data
+  this->reset();
+}
+
+#endif //EXPERIMENTAL_I2CBUS