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Tasmota/tasmota/tasmota_support/support_a_i2c.ino

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/*
support_a_i2c.ino - I2C support for Tasmota
SPDX-FileCopyrightText: 2022 Theo Arends
SPDX-License-Identifier: GPL-3.0-only
*/
#ifdef USE_I2C
/*********************************************************************************************\
* Basic I2C routines supporting two busses
\*********************************************************************************************/
#ifdef ESP8266
#ifdef USE_I2C_BUS2
#define USE_I2C_BUS2_ESP8266
#endif // USE_I2C_BUS2_ESP8266
#endif // ESP8266
const uint8_t I2C_RETRY_COUNTER = 3;
struct I2Ct {
uint32_t buffer;
uint32_t frequency[2];
#ifdef USE_I2C_BUS2
uint32_t active[2][4];
#else
uint32_t active[1][4];
#endif // No USE_I2C_BUS2
#ifdef USE_I2C_BUS2_ESP8266
int8_t sda[2];
int8_t scl[2];
int8_t active_bus = -1;
#endif // USE_I2C_BUS2_ESP8266
} I2C;
#ifdef USE_I2C_BUS2_ESP8266
TwoWire Wire1 = Wire; // Not really backward compatible with ESP32
void I2cSetBus(uint32_t bus = 0);
void I2cSetBus(uint32_t bus) {
if (I2C.active_bus != bus) {
I2C.active_bus = bus;
Wire.begin(I2C.sda[bus], I2C.scl[bus]);
Wire.setClock(I2C.frequency[bus]);
}
}
#endif // USE_I2C_BUS2_ESP8266
bool I2cBegin(int sda, int scl, uint32_t bus = 0, uint32_t frequency = 100000);
bool I2cBegin(int sda, int scl, uint32_t bus, uint32_t frequency) {
I2C.frequency[bus] = frequency;
bool result = true;
#ifdef ESP8266
#ifdef USE_I2C_BUS2_ESP8266
I2C.sda[bus] = sda;
I2C.scl[bus] = scl;
I2cSetBus();
#else
if (bus > 0) { return false; }
Wire.begin(sda, scl);
Wire.setClock(frequency);
#endif // USE_I2C_BUS2_ESP8266
#endif // ESP8266
#ifdef ESP32
#ifdef USE_I2C_BUS2
TwoWire& myWire = (0 == bus) ? Wire : Wire1;
#else
if (bus > 0) { return false; }
TwoWire& myWire = Wire;
#endif
static bool reinit = false;
if (reinit) { myWire.end(); }
result = myWire.begin(sda, scl, frequency);
reinit = result;
#endif // ESP32
// AddLog(LOG_LEVEL_DEBUG, PSTR("I2C: Bus%d %d"), bus +1, result);
return result;
}
TwoWire * I2CSerialGetWire(TwoWire * orig_wire, uint8_t bus);
TwoWire& I2cGetWire(uint8_t bus = 0) {
if ((0 == bus) && TasmotaGlobal.i2c_enabled[0]) {
#ifdef USE_I2C_BUS2_ESP8266
I2cSetBus(bus);
#endif
#ifdef USE_I2C_SERIAL
return I2CSerialGetWire(Wire, bus);
#else
return Wire;
#endif // USE_I2C_SERIAL
}
#ifdef USE_I2C_BUS2
else if ((1 == bus) && TasmotaGlobal.i2c_enabled[1]) {
#ifdef USE_I2C_BUS2_ESP8266
I2cSetBus(bus);
#endif
#ifdef USE_I2C_SERIAL
return I2CSerialGetWire(Wire1, bus);
#else
return Wire1;
#endif // USE_I2C_SERIAL
}
#endif // USE_I2C_BUS2
else {
// AddLog(LOG_LEVEL_ERROR, PSTR("I2C: bus%d not initialized"), bus +1);
return *(TwoWire*)nullptr;
}
}
bool I2cSetClock(uint32_t frequency = 0, uint32_t bus = 0);
bool I2cSetClock(uint32_t frequency, uint32_t bus) {
TwoWire& myWire = I2cGetWire(bus);
if (&myWire == nullptr) { return false; } // No valid I2c bus
if (0 == frequency) {
if (0 == I2C.frequency[bus]) {
I2C.frequency[bus] = 100000; // Tasmota default I2C bus speed
}
} else {
I2C.frequency[bus] = frequency;
}
if (frequency != I2C.frequency[bus]) {
myWire.setClock(I2C.frequency[bus]);
}
return true;
}
/*-------------------------------------------------------------------------------------------*\
* Return code: 0 = Error, 1 = OK
\*-------------------------------------------------------------------------------------------*/
bool I2cValidRead(uint8_t addr, uint8_t reg, uint8_t size, uint8_t bus = 0, bool sendStop = false) {
I2C.buffer = 0;
TwoWire& myWire = I2cGetWire(bus);
if (&myWire == nullptr) { return false; } // No valid I2c bus
uint8_t retry = I2C_RETRY_COUNTER;
bool status = false;
while (!status && retry) {
myWire.beginTransmission(addr); // start transmission to device
myWire.write(reg); // sends register address to read from
if (0 == myWire.endTransmission(sendStop)) { // Try to become I2C Master, send data and collect bytes, keep master status for next request...
myWire.requestFrom((int)addr, (int)size); // send data n-bytes read
if (myWire.available() == size) {
for (uint32_t i = 0; i < size; i++) {
I2C.buffer = I2C.buffer << 8 | myWire.read(); // receive DATA
}
status = true; // 1 = OK
}
}
retry--;
}
if (!retry) myWire.endTransmission();
#ifdef USE_I2C_BUS2_ESP8266
I2cSetBus();
#endif
return status; // 0 = Error, 1 = OK
}
bool I2cValidRead8(uint8_t *data, uint8_t addr, uint8_t reg, uint8_t bus = 0) {
bool status = I2cValidRead(addr, reg, 1, bus);
*data = (uint8_t)I2C.buffer;
return status; // 0 = Error, 1 = OK
}
bool I2cValidRead16(uint16_t *data, uint8_t addr, uint8_t reg, uint8_t bus = 0) {
bool status = I2cValidRead(addr, reg, 2, bus);
*data = (uint16_t)I2C.buffer;
return status; // 0 = Error, 1 = OK
}
bool I2cValidReadS16(int16_t *data, uint8_t addr, uint8_t reg, uint8_t bus = 0) {
bool status = I2cValidRead(addr, reg, 2, bus);
*data = (int16_t)I2C.buffer;
return status; // 0 = Error, 1 = OK
}
bool I2cValidRead16LE(uint16_t *data, uint8_t addr, uint8_t reg, uint8_t bus = 0) {
uint16_t ldata;
bool status = I2cValidRead16(&ldata, addr, reg, bus);
*data = (ldata >> 8) | (ldata << 8);
return status; // 0 = Error, 1 = OK
}
bool I2cValidReadS16_LE(int16_t *data, uint8_t addr, uint8_t reg, uint8_t bus = 0) {
uint16_t ldata;
bool status = I2cValidRead16LE(&ldata, addr, reg, bus);
*data = (int16_t)ldata;
return status; // 0 = Error, 1 = OK
}
bool I2cValidRead24(int32_t *data, uint8_t addr, uint8_t reg, uint8_t bus = 0) {
bool status = I2cValidRead(addr, reg, 3, bus);
*data = I2C.buffer;
return status; // 0 = Error, 1 = OK
}
uint8_t I2cRead8(uint8_t addr, uint8_t reg, uint8_t bus = 0) {
I2cValidRead(addr, reg, 1, bus);
return (uint8_t)I2C.buffer;
}
uint16_t I2cRead16(uint8_t addr, uint8_t reg, uint8_t bus = 0) {
I2cValidRead(addr, reg, 2, bus);
return (uint16_t)I2C.buffer;
}
int16_t I2cReadS16(uint8_t addr, uint8_t reg, uint8_t bus = 0) {
I2cValidRead(addr, reg, 2, bus);
return (int16_t)I2C.buffer;
}
uint16_t I2cRead16LE(uint8_t addr, uint8_t reg, uint8_t bus = 0) {
I2cValidRead(addr, reg, 2, bus);
uint16_t temp = (uint16_t)I2C.buffer;
return (temp >> 8) | (temp << 8);
}
int16_t I2cReadS16_LE(uint8_t addr, uint8_t reg, uint8_t bus = 0) {
return (int16_t)I2cRead16LE(addr, reg, bus);
}
int32_t I2cRead24(uint8_t addr, uint8_t reg, uint8_t bus = 0) {
I2cValidRead(addr, reg, 3, bus);
return I2C.buffer;
}
/*-------------------------------------------------------------------------------------------*/
bool I2cWrite(uint8_t addr, uint8_t reg, uint32_t val, uint8_t size, uint8_t bus = 0) {
TwoWire& myWire = I2cGetWire(bus);
if (&myWire == nullptr) { return false; } // No valid I2c bus
uint8_t x = I2C_RETRY_COUNTER;
do {
myWire.beginTransmission((uint8_t)addr); // start transmission to device
myWire.write(reg); // sends register address to write to
uint8_t bytes = size;
while (bytes--) {
myWire.write((val >> (8 * bytes)) & 0xFF); // write data
}
x--;
} while (myWire.endTransmission(true) != 0 && x != 0); // end transmission
#ifdef USE_I2C_BUS2_ESP8266
I2cSetBus();
#endif
return (x); // 0 = Error, 1 = OK
}
bool I2cWrite0(uint8_t addr, uint8_t reg, uint8_t bus = 0) {
return I2cWrite(addr, reg, 0, 0, bus); // 0 = Error, 1 = OK
}
bool I2cWrite8(uint8_t addr, uint8_t reg, uint32_t val, uint8_t bus = 0) {
return I2cWrite(addr, reg, val, 1, bus); // 0 = Error, 1 = OK
}
bool I2cWrite16(uint8_t addr, uint8_t reg, uint32_t val, uint8_t bus = 0) {
return I2cWrite(addr, reg, val, 2, bus); // 0 = Error, 1 = OK
}
/*-------------------------------------------------------------------------------------------*\
* Return code: 0 = OK, 1 = Error
\*-------------------------------------------------------------------------------------------*/
bool I2cReadBuffer0(uint8_t addr, uint8_t *reg_data, uint16_t len, uint8_t bus = 0) {
TwoWire& myWire = I2cGetWire(bus);
if (&myWire == nullptr) { return true; } // No valid I2c bus
myWire.requestFrom((uint8_t)addr, (uint8_t)len);
if (myWire.available() != len) {
#ifdef USE_I2C_BUS2_ESP8266
I2cSetBus();
#endif
return true; // 1 = Error
}
while (len--) {
*reg_data = (uint8_t)myWire.read();
reg_data++;
}
#ifdef USE_I2C_BUS2_ESP8266
I2cSetBus();
#endif
return false; // 0 = OK
}
bool I2cReadBuffer(uint8_t addr, int reg, uint8_t *reg_data, uint16_t len, uint8_t bus = 0) {
TwoWire& myWire = I2cGetWire(bus);
if (&myWire == nullptr) { return true; } // No valid I2c bus
myWire.beginTransmission((uint8_t)addr);
if (reg > -1) {
myWire.write((uint8_t)reg);
if (reg > 255) {
myWire.write((uint8_t)(reg >> 8));
}
myWire.endTransmission();
}
if (len != myWire.requestFrom((uint8_t)addr, (uint8_t)len)) {
#ifdef USE_I2C_BUS2_ESP8266
I2cSetBus();
#endif
return true; // 1 = Error
}
while (len--) {
*reg_data = (uint8_t)myWire.read();
reg_data++;
}
if (reg < 0) {
myWire.endTransmission();
}
#ifdef USE_I2C_BUS2_ESP8266
I2cSetBus();
#endif
return false; // 0 = OK
}
bool I2cWriteBuffer(uint8_t addr, uint8_t reg, uint8_t *reg_data, uint16_t len, uint8_t bus = 0) {
TwoWire& myWire = I2cGetWire(bus);
if (&myWire == nullptr) { return true; } // 1 = Error, No valid I2c bus
myWire.beginTransmission((uint8_t)addr);
myWire.write((uint8_t)reg);
while (len--) {
myWire.write(*reg_data);
reg_data++;
}
myWire.endTransmission();
#ifdef USE_I2C_BUS2_ESP8266
I2cSetBus();
#endif
return false; // 0 = OK
}
/*-------------------------------------------------------------------------------------------*/
void I2cScan(uint8_t bus = 0) {
// Return error codes defined in twi.h and core_esp8266_si2c.c
// I2C_OK 0
// I2C_SCL_HELD_LOW 1 = SCL held low by another device, no procedure available to recover
// I2C_SCL_HELD_LOW_AFTER_READ 2 = I2C bus error. SCL held low beyond client clock stretch time
// I2C_SDA_HELD_LOW 3 = I2C bus error. SDA line held low by client/another_master after n bits
// I2C_SDA_HELD_LOW_AFTER_INIT 4 = line busy. SDA again held low by another device. 2nd master?
// 5 = bus busy. Timeout
// https://www.arduino.cc/reference/en/language/functions/communication/wire/endtransmission/
// 0: success
// 1: data too long to fit in transmit buffer
// 2: received NACK on transmit of address
// 3: received NACK on transmit of data
// 4: other error
// 5: timeout
TwoWire& myWire = I2cGetWire(bus);
if (&myWire == nullptr) { return; } // No valid I2c bus
Response_P(PSTR("{\"" D_CMND_I2CSCAN "\":\"Device(s) found "));
#ifdef USE_I2C_BUS2
ResponseAppend_P(PSTR("on bus%d "), bus +1);
#endif
ResponseAppend_P(PSTR("at"));
uint8_t error = 0;
uint8_t address = 0;
uint8_t any = 0;
for (address = 1; address <= 127; address++) {
myWire.beginTransmission(address);
error = myWire.endTransmission();
if (0 == error) {
any = 1;
ResponseAppend_P(PSTR(" 0x%02x"), address);
}
else if (error != 2) { // Seems to happen anyway using this scan
any = 2;
Response_P(PSTR("{\"" D_CMND_I2CSCAN "\":\"Error %d at 0x%02x"), error, address);
#ifdef USE_I2C_BUS2
ResponseAppend_P(PSTR(" (bus%d)"), bus +1);
#endif // USE_I2C_BUS2
break;
}
}
#ifdef USE_I2C_BUS2_ESP8266
I2cSetBus();
#endif
if (any) {
ResponseAppend_P(PSTR("\"}"));
} else {
Response_P(PSTR("{\"" D_CMND_I2CSCAN "\":\"No devices found\"}"));
}
}
void I2cResetActive(uint32_t addr, uint8_t bus = 0) {
addr &= 0x7F; // Max I2C address is 127
I2C.active[bus][addr / 32] &= ~(1 << (addr % 32));
// AddLog(LOG_LEVEL_DEBUG, PSTR("I2C: I2cResetActive bus0 %08X-%08X-%08X-%08X, bus1 %08X-%08X-%08X-%08X"),
// I2C.active[0][0], I2C.active[0][1], I2C.active[0][2], I2C.active[0][3],
// I2C.active[1][0], I2C.active[1][1], I2C.active[1][2], I2C.active[1][3]);
}
void I2cSetActive(uint32_t addr, uint8_t bus = 0) {
addr &= 0x7F; // Max I2C address is 127
I2C.active[bus][addr / 32] |= (1 << (addr % 32));
// AddLog(LOG_LEVEL_DEBUG, PSTR("I2C: I2cSetActive addr %02X, bus%d, bus0 %08X-%08X-%08X-%08X, bus1 %08X-%08X-%08X-%08X"),
// addr, bus,
// I2C.active[0][0], I2C.active[0][1], I2C.active[0][2], I2C.active[0][3],
// I2C.active[1][0], I2C.active[1][1], I2C.active[1][2], I2C.active[1][3]);
}
void I2cSetActiveFound(uint32_t addr, const char *types, uint8_t bus = 0) {
I2cSetActive(addr, bus);
AddLog(LOG_LEVEL_INFO, PSTR("I2C: %s found at 0x%02x%s"), types, addr, (bus)?" (bus2)":"");
}
bool I2cActive(uint32_t addr, uint8_t bus = 0) {
addr &= 0x7F; // Max I2C address is 127
return (I2C.active[bus][addr / 32] & (1 << (addr % 32)));
}
bool I2cSetDevice(uint32_t addr, uint8_t bus = 0) {
addr &= 0x7F; // Max I2C address is 127
if (I2cActive(addr, bus)) {
return false; // If already active report as not present;
}
TwoWire& myWire = I2cGetWire(bus);
if (&myWire == nullptr) { return false; } // No valid I2c bus
myWire.beginTransmission((uint8_t)addr);
// return (0 == myWire.endTransmission());
uint32_t err = myWire.endTransmission();
#ifdef USE_I2C_BUS2_ESP8266
I2cSetBus();
#endif
if (err && (err != 2)) {
AddLog(LOG_LEVEL_DEBUG, PSTR("I2C: Error %d at 0x%02x%s"), err, addr, (bus)?" (bus2)":"");
}
return (0 == err);
}
#endif // USE_I2C
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