Firmware/Marlin/twibus.cpp

105 lines
2.6 KiB
C++

/*
* 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