Fully guard I2C Slave in preparation for C2 support (#8882)

Author: me-no-dev

Diff for: libraries/Wire/examples/WireSlave/.skip.esp32c2

@@ -32,7 +32,9 @@ extern "C" {
 }
 
 #include "esp32-hal-i2c.h"
+#if SOC_I2C_SUPPORT_SLAVE
 #include "esp32-hal-i2c-slave.h"
+#endif /* SOC_I2C_SUPPORT_SLAVE */
 #include "Wire.h"
 #include "Arduino.h"
 
@@ -53,9 +55,11 @@ TwoWire::TwoWire(uint8_t bus_num)
     ,nonStopTask(NULL)
     ,lock(NULL)
 #endif
+#if SOC_I2C_SUPPORT_SLAVE
     ,is_slave(false)
     ,user_onRequest(NULL)
     ,user_onReceive(NULL)
+#endif /* SOC_I2C_SUPPORT_SLAVE */
 {}
 
 TwoWire::~TwoWire()
@@ -297,10 +301,12 @@ bool TwoWire::begin(int sdaPin, int sclPin, uint32_t frequency)
         return false;
     }
 #endif
+#if SOC_I2C_SUPPORT_SLAVE
     if(is_slave){
         log_e("Bus already started in Slave Mode.");
         goto end;
     }
+#endif /* SOC_I2C_SUPPORT_SLAVE */
     if(i2cIsInit(num)){
         log_w("Bus already started in Master Mode.");
         started = true;
@@ -337,12 +343,15 @@ bool TwoWire::end()
             return false;
         }
 #endif
+#if SOC_I2C_SUPPORT_SLAVE
         if(is_slave){
             err = i2cSlaveDeinit(num);
             if(err == ESP_OK){
                 is_slave = false;
             }
-        } else if(i2cIsInit(num)){
+        } else
+#endif /* SOC_I2C_SUPPORT_SLAVE */
+        if(i2cIsInit(num)){
             err = i2cDeinit(num);
         }
         freeWireBuffer();
@@ -363,9 +372,12 @@ uint32_t TwoWire::getClock()
         log_e("could not acquire lock");
     } else {
 #endif
+#if SOC_I2C_SUPPORT_SLAVE
         if(is_slave){
             log_e("Bus is in Slave Mode");
-        } else {
+        } else 
+#endif /* SOC_I2C_SUPPORT_SLAVE */
+        {
             i2cGetClock(num, &frequency);
         }
 #if !CONFIG_DISABLE_HAL_LOCKS
@@ -386,10 +398,13 @@ bool TwoWire::setClock(uint32_t frequency)
         return false;
     }
 #endif
+#if SOC_I2C_SUPPORT_SLAVE
     if(is_slave){
         log_e("Bus is in Slave Mode");
         err = ESP_FAIL;
-    } else {
+    } else 
+#endif /* SOC_I2C_SUPPORT_SLAVE */
+    {
         err = i2cSetClock(num, frequency);
     }
 #if !CONFIG_DISABLE_HAL_LOCKS
@@ -411,10 +426,12 @@ uint16_t TwoWire::getTimeOut()
 
 void TwoWire::beginTransmission(uint16_t address)
 {
+#if SOC_I2C_SUPPORT_SLAVE
     if(is_slave){
         log_e("Bus is in Slave Mode");
         return;
     }
+#endif /* SOC_I2C_SUPPORT_SLAVE */
 #if !CONFIG_DISABLE_HAL_LOCKS
     if(nonStop && nonStopTask == xTaskGetCurrentTaskHandle()){
         log_e("Unfinished Repeated Start transaction! Expected requestFrom, not beginTransmission! Clearing...");
@@ -444,10 +461,12 @@ endTransmission() returns:
 */
 uint8_t TwoWire::endTransmission(bool sendStop)
 {
+#if SOC_I2C_SUPPORT_SLAVE
     if(is_slave){
         log_e("Bus is in Slave Mode");
         return 4;
     }
+#endif /* SOC_I2C_SUPPORT_SLAVE */
     if (txBuffer == NULL){
         log_e("NULL TX buffer pointer");
         return 4;
@@ -477,10 +496,12 @@ uint8_t TwoWire::endTransmission(bool sendStop)
 
 size_t TwoWire::requestFrom(uint16_t address, size_t size, bool sendStop)
 {
+#if SOC_I2C_SUPPORT_SLAVE
     if(is_slave){
         log_e("Bus is in Slave Mode");
         return 0;
     }
+#endif /* SOC_I2C_SUPPORT_SLAVE */
     if (rxBuffer == NULL || txBuffer == NULL){
         log_e("NULL buffer pointer");
         return 0;

Diff for: libraries/Wire/src/Wire.cpp

@@ -45,8 +45,10 @@
 #ifndef I2C_BUFFER_LENGTH
     #define I2C_BUFFER_LENGTH 128  // Default size, if none is set using Wire::setBuffersize(size_t)
 #endif
+#if SOC_I2C_SUPPORT_SLAVE
 typedef void(*user_onRequest)(void);
 typedef void(*user_onReceive)(uint8_t*, int);
+#endif /* SOC_I2C_SUPPORT_SLAVE */
 
 class TwoWire: public Stream
 {
@@ -71,8 +73,8 @@ class TwoWire: public Stream
     SemaphoreHandle_t lock;
 #endif
 private:
-    bool is_slave;
 #if SOC_I2C_SUPPORT_SLAVE
+    bool is_slave;
     void (*user_onRequest)(void);
     void (*user_onReceive)(int);
     static void onRequestService(uint8_t, void *);
@@ -90,12 +92,15 @@ class TwoWire: public Stream
     bool setPins(int sda, int scl);
 
     bool begin(int sda, int scl, uint32_t frequency=0); // returns true, if successful init of i2c bus
+#if SOC_I2C_SUPPORT_SLAVE
     bool begin(uint8_t slaveAddr, int sda, int scl, uint32_t frequency);
+#endif /* SOC_I2C_SUPPORT_SLAVE */
     // Explicit Overload for Arduino MainStream API compatibility
     inline bool begin()
     {
         return begin(-1, -1, static_cast<uint32_t>(0));
     }
+#if SOC_I2C_SUPPORT_SLAVE
     inline bool begin(uint8_t addr)
     {
         return begin(addr, -1, -1, 0);
@@ -104,6 +109,7 @@ class TwoWire: public Stream
     {
         return begin(static_cast<uint8_t>(addr), -1, -1, 0);
     }
+#endif /* SOC_I2C_SUPPORT_SLAVE */
     bool end();
 
     size_t setBufferSize(size_t bSize);