ESP32 support for secondary I2C controller

CHANGELOG.md

@@ -16,6 +16,7 @@ All notable changes to this project will be documented in this file.
 - Crash protection in ext_vnsprintf_P (#11202)
 - Extent compile time SetOptions support (#11204)
 - ESP32 Extent BLE (#11212)
+- ESP32 support for secondary I2C controller
 
 ### Changed
 - ESP32 core library from v1.0.5-rc6 to v1.0.5

tasmota/support.ino

@@ -1969,7 +1969,8 @@ int8_t I2cWriteBuffer(uint8_t addr, uint8_t reg, uint8_t *reg_data, uint16_t len
   return 0;
 }
 
-void I2cScan(char *devs, unsigned int devs_len)
+void I2cScan(char *devs, unsigned int devs_len, uint32_t bus = 0);
+void I2cScan(char *devs, unsigned int devs_len, uint32_t bus)
 {
   // Return error codes defined in twi.h and core_esp8266_si2c.c
   // I2C_OK                      0
@@ -1984,8 +1985,13 @@ void I2cScan(char *devs, unsigned int devs_len)
 
   snprintf_P(devs, devs_len, PSTR("{\"" D_CMND_I2CSCAN "\":\"" D_JSON_I2CSCAN_DEVICES_FOUND_AT));
   for (address = 1; address <= 127; address++) {
-    Wire.beginTransmission(address);
-    error = Wire.endTransmission();
+#ifdef ESP32
+    TwoWire & myWire = (bus == 0) ? Wire : Wire1;
+#else
+    TwoWire & myWire = Wire;
+#endif
+    myWire.beginTransmission(address);
+    error = myWire.endTransmission();
     if (0 == error) {
       any = 1;
       snprintf_P(devs, devs_len, PSTR("%s 0x%02x"), devs, address);

tasmota/support_command.ino

@@ -2071,9 +2071,14 @@ void CmndWifiPower(void)
 #ifdef USE_I2C
 void CmndI2cScan(void)
 {
-  if (TasmotaGlobal.i2c_enabled) {
+  if ((1 == XdrvMailbox.index) && (TasmotaGlobal.i2c_enabled)) {
     I2cScan(TasmotaGlobal.mqtt_data, sizeof(TasmotaGlobal.mqtt_data));
   }
+#ifdef ESP32
+  if ((2 == XdrvMailbox.index) && (TasmotaGlobal.i2c_enabled_2)) {
+    I2cScan(TasmotaGlobal.mqtt_data, sizeof(TasmotaGlobal.mqtt_data), 1);
+  }
+#endif
 }
 
 void CmndI2cDriver(void)

tasmota/support_tasmota.ino

@@ -1742,6 +1742,12 @@ void GpioInit(void)
   if (TasmotaGlobal.i2c_enabled) {
     Wire.begin(Pin(GPIO_I2C_SDA), Pin(GPIO_I2C_SCL));
   }
+#ifdef ESP32
+  TasmotaGlobal.i2c_enabled_2 = (PinUsed(GPIO_I2C_SCL, 1) && PinUsed(GPIO_I2C_SDA, 1));
+  if (TasmotaGlobal.i2c_enabled_2) {
+    Wire1.begin(Pin(GPIO_I2C_SDA, 1), Pin(GPIO_I2C_SCL, 1));
+  }
+#endif
 #endif  // USE_I2C
 
   TasmotaGlobal.devices_present = 0;

tasmota/tasmota.h

@@ -84,6 +84,12 @@ const uint8_t MAX_PCF8574 = 4;              // Max number of PCF8574 devices
 const uint8_t MAX_RULE_SETS = 3;            // Max number of rule sets of size 512 characters
 const uint16_t MAX_RULE_SIZE = 512;         // Max number of characters in rules
 
+#ifdef ESP32
+const uint8_t MAX_I2C = 2;                  // Max number of I2C controllers (ESP32 = 2)
+#else
+const uint8_t MAX_I2C = 0;                  // Max number of I2C controllers (ESP8266 = 0, no choice)
+#endif
+
 // Changes to the following MAX_ defines need to be in line with enum SettingsTextIndex
 const uint8_t MAX_MQTT_PREFIXES = 3;        // Max number of MQTT prefixes (cmnd, stat, tele)
 const uint8_t MAX_SSIDS = 2;                // Max number of SSIDs

tasmota/tasmota.ino

@@ -141,6 +141,9 @@ struct {
   bool blinkstate;                          // LED state
   bool pwm_present;                         // Any PWM channel configured with SetOption15 0
   bool i2c_enabled;                         // I2C configured
+#ifdef ESP32
+  bool i2c_enabled_2;                        // I2C configured, second controller on ESP32, Wire1
+#endif
   bool ntp_force_sync;                      // Force NTP sync
   bool skip_light_fade;                     // Temporarily skip light fading
   bool restart_halt;                        // Do not restart but stay in wait loop

tasmota/tasmota_template.h

@@ -386,8 +386,8 @@ const uint16_t kGpioNiceList[] PROGMEM = {
 \*-------------------------------------------------------------------------------------------*/
 
 #ifdef USE_I2C
-  AGPIO(GPIO_I2C_SCL),                  // I2C SCL
-  AGPIO(GPIO_I2C_SDA),                  // I2C SDA
+  AGPIO(GPIO_I2C_SCL) + MAX_I2C,        // I2C SCL
+  AGPIO(GPIO_I2C_SDA) + MAX_I2C,        // I2C SDA
 #endif
 
 #ifdef USE_SPI