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Code Issues Releases Activity

Add Drivers PCA9685 and PCF8574 multi I2C bus support

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Theo Arends
2026-03-30 12:07:22 +02:00
parent 5cc4ddb5f0
commit f56d12b1bf
4 changed files with 48 additions and 26 deletions
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CHANGELOG.md
+1 -1
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@@ -6,7 +6,7 @@ All notable changes to this project will be documented in this file.
## [15.3.0.3]
### Added
- Environment sensor SCD30 second I2C bus support
- PWM driver PCA9685 multi I2C bus support
- Drivers PCA9685 and PCF8574 multi I2C bus support
### Breaking Changed
I2CDEVICES.md
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@@ -10,8 +10,8 @@ Index | Define | Driver | Device | Address(es) | Bus2 | Descrip
------|---------------------|----------|----------|-------------|------|-----------------------------------------------
1 | USE_PCA9685 | xdrv_15 | PCA9685 | 0x40 - 0x47 | Yes | 16-channel 12-bit pwm driver
1 | USE_PCA9685_V2 | xdrv_15 | PCA9685 | 0x40 - 0x47 | Yes | 16-channel 12-bit pwm driver
2 | USE_PCF8574 | xdrv_28 | PCF8574 | 0x20 - 0x26 | | 8-bit I/O expander (address range overridable)
2 | USE_PCF8574 | xdrv_28 | PCF8574A | 0x39 - 0x3F | | 8-bit I/O expander (address range overridable)
2 | USE_PCF8574 | xdrv_28 | PCF8574 | 0x20 - 0x26 | Yes | 8-bit I/O expander (address range overridable)
2 | USE_PCF8574 | xdrv_28 | PCF8574A | 0x39 - 0x3F | Yes | 8-bit I/O expander (address range overridable)
3 | USE_DISPLAY_LCD | xdsp_01 | | 0x27, 0x3F | Yes | LCD display
4 | REMOVED | | | | | USE_DISPLAY_SSD1306 - REMOVED
5 | USE_DISPLAY_MATRIX | xdsp_03 | HT16K33 | 0x70 - 0x77 | | 8x8 led matrix
RELEASENOTES.md
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@@ -118,7 +118,7 @@ The latter links can be used for OTA upgrades too like ``OtaUrl https://ota.tasm
- Support for Sensirion SCD42 and SCD43 CO2 sensor
- Support for Sensirion STCC4 CO2 sensor
- ESP8266 redesigned I2C Wire driver to support second I2C bus
- PWM driver PCA9685 multi I2C bus support
- Drivers PCA9685 and PCF8574 multi I2C bus support
- Environment sensors CCS811, SCD30, SGP30 and SGP40 multi I2C bus support
- Real Time Clocks BM8563, PCF85063 and PCF85363 multi I2C bus support
- LCD multi I2C bus support
tasmota/tasmota_xdrv_driver/xdrv_28_pcf8574_v2.ino
+44 -22
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@@ -113,6 +113,7 @@ struct PCF8574 {
uint32_t relay_inverted;
uint32_t button_inverted;
uint8_t address[MAX_PCF8574];
uint8_t bus[MAX_PCF8574];
uint8_t pin_mask[MAX_PCF8574] = { 0 };
#ifdef USE_PCF8574_MQTTINPUT
uint8_t last_input[MAX_PCF8574] = { 0 };
@@ -137,14 +138,29 @@ uint16_t *Pcf8574_pin = nullptr;
\*********************************************************************************************/
uint8_t Pcf8574Read(uint8_t idx) {
/*
Wire.requestFrom(Pcf8574.address[idx], (uint8_t)1);
return Wire.read();
*/
TwoWire& myWire = I2cGetWire(Pcf8574.bus[idx]);
myWire.requestFrom(Pcf8574.address[idx], (uint8_t)1);
return myWire.read();
}
void Pcf8574WriteData(uint8_t idx, uint8_t data) {
TwoWire& myWire = I2cGetWire(Pcf8574.bus[idx]);
myWire.beginTransmission(Pcf8574.address[idx]);
myWire.write(data);
myWire.endTransmission();
}
void Pcf8574Write(uint8_t idx) {
/*
Wire.beginTransmission(Pcf8574.address[idx]);
Wire.write(Pcf8574.pin_mask[idx]);
Wire.endTransmission();
*/
Pcf8574WriteData(idx, Pcf8574.pin_mask[idx]);
}
#ifdef USE_PCF8574_MODE2
@@ -170,9 +186,12 @@ void Pcf8574DigitalWrite(uint8_t pin, bool pin_value) {
} else {
value &= ~(1 << bit);
}
/*
Wire.beginTransmission(Pcf8574.address[chip]);
Wire.write(value);
Wire.endTransmission();
*/
Pcf8574WriteData(chip, value);
}
void Pcf8574DigitalWriteConfig(uint8_t pin, bool pin_value) {
@@ -629,34 +648,37 @@ void Pcf8574ShowJson(void) {
\*********************************************************************************************/
void Pcf8574ModuleInit(void) {
uint8_t pcf8574_address = (PCF8574_ADDR1_COUNT > 0) ? PCF8574_ADDR1 : PCF8574_ADDR2;
while ((Pcf8574.max_devices < MAX_PCF8574) && (pcf8574_address < PCF8574_ADDR2 +PCF8574_ADDR2_COUNT)) {
for (uint32_t bus = 0; bus < MAX_I2C; bus++) {
uint8_t pcf8574_address = (PCF8574_ADDR1_COUNT > 0) ? PCF8574_ADDR1 : PCF8574_ADDR2;
while ((Pcf8574.max_devices < MAX_PCF8574) && (pcf8574_address < PCF8574_ADDR2 +PCF8574_ADDR2_COUNT)) {
#if defined(USE_MCP230xx) && defined(USE_MCP230xx_ADDR)
if (USE_MCP230xx_ADDR == pcf8574_address) {
AddLog(LOG_LEVEL_INFO, PSTR("PCF: Address 0x%02x reserved for MCP230xx"), pcf8574_address);
} else {
#endif
#if defined(USE_MCP230xx) && defined(USE_MCP230xx_ADDR)
if (USE_MCP230xx_ADDR == pcf8574_address) {
AddLog(LOG_LEVEL_INFO, PSTR("PCF: Address 0x%02x reserved for MCP230xx"), pcf8574_address);
} else {
#endif
if (I2cSetDevice(pcf8574_address)) {
Pcf8574.mode = 1;
if (I2cSetDevice(pcf8574_address, bus)) {
Pcf8574.mode = 1;
Pcf8574.max_connected_ports += 8;
Pcf8574.address[Pcf8574.max_devices] = pcf8574_address;
Pcf8574.max_devices++;
Pcf8574.max_connected_ports += 8;
Pcf8574.address[Pcf8574.max_devices] = pcf8574_address;
Pcf8574.bus[Pcf8574.max_devices] = bus;
Pcf8574.max_devices++;
char stype[12];
sprintf_P(stype, PSTR("PCF8574%s"), (pcf8574_address >= PCF8574_ADDR2) ? "A" : "");
I2cSetActiveFound(pcf8574_address, stype);
char stype[12];
sprintf_P(stype, PSTR("PCF8574%s"), (pcf8574_address >= PCF8574_ADDR2) ? "A" : "");
I2cSetActiveFound(pcf8574_address, stype, bus);
}
#if defined(USE_MCP230xx) && defined(USE_MCP230xx_ADDR)
}
#endif
#if defined(USE_MCP230xx) && defined(USE_MCP230xx_ADDR)
}
#endif
pcf8574_address++;
if ((PCF8574_ADDR1 +PCF8574_ADDR1_COUNT) == pcf8574_address) { // Support I2C addresses 0x20 to 0x26 and 0x39 to 0x3F
pcf8574_address = PCF8574_ADDR2;
pcf8574_address++;
if ((PCF8574_ADDR1 +PCF8574_ADDR1_COUNT) == pcf8574_address) { // Support I2C addresses 0x20 to 0x26 and 0x39 to 0x3F
pcf8574_address = PCF8574_ADDR2;
}
}
}