Firmware/Marlin/twibus.cpp
2016-08-10 23:30:35 -07:00

118 lines
2.8 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() {
#if I2C_SLAVE_ADDRESS == 0
Wire.begin(); // No address joins the BUS as the master
#else
Wire.begin(I2C_SLAVE_ADDRESS); // Join the bus as a slave
#endif
this->reset();
}
void TWIBus::reset() {
this->buffer_s = 0;
this->buffer[0] = 0x00;
}
void TWIBus::address(const uint8_t addr) {
this->addr = addr;
#if ENABLED(DEBUG_TWIBUS)
debug(PSTR("address"), this->addr);
#endif
}
void TWIBus::addbyte(const char c) {
if (buffer_s >= sizeof(this->buffer)) return;
this->buffer[this->buffer_s++] = c;
#if ENABLED(DEBUG_TWIBUS)
debug(PSTR("addbyte"), this->buffer[this->buffer_s - 1]);
#endif
}
void TWIBus::send() {
if (!this->addr) return;
#if ENABLED(DEBUG_TWIBUS)
debug(PSTR("send()"));
#endif
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(const uint8_t bytes) {
if (!this->addr) return;
#if ENABLED(DEBUG_TWIBUS)
debug(PSTR("reqbytes"), bytes);
#endif
// requestFrom() is a blocking function
millis_t t = millis() + this->timeout;
Wire.requestFrom(this->addr, bytes);
while (Wire.available() < bytes && PENDING(millis(), t)) { /*nada*/ }
this->relaydata(bytes);
// Reset the buffer after sending the data
this->reset();
}
void TWIBus::relaydata(uint8_t bytes) {
SERIAL_ECHO_START;
SERIAL_ECHOPAIR("i2c-reply: from:", this->addr);
SERIAL_ECHOPAIR(" bytes:", bytes);
SERIAL_ECHOPGM (" data:");
while (bytes-- && Wire.available()) SERIAL_CHAR(Wire.read());
SERIAL_EOL;
}
#if ENABLED(DEBUG_TWIBUS)
void TWIBus::debug(const char func[], int32_t val/*=-1*/) {
if (DEBUGGING(INFO)) {
SERIAL_ECHOPGM("TWIBus::");
serialprintPGM(func);
if (val >= 0) SERIAL_ECHOPAIR(": ", val);
SERIAL_EOL;
}
}
#endif
#endif //EXPERIMENTAL_I2CBUS