[I2C] Review errors management

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

cores/arduino/stm32/twi.c

@@ -762,8 +762,12 @@ i2c_status_e i2c_master_write(i2c_t *obj, uint8_t dev_address,
       if ((delta > I2C_TIMEOUT_TICK)
           || ((err & HAL_I2C_ERROR_TIMEOUT) == HAL_I2C_ERROR_TIMEOUT)) {
         ret = I2C_TIMEOUT;
-      } else if (err != HAL_I2C_ERROR_NONE) {
-        ret = I2C_ERROR;
+      } else {
+        if ((err & HAL_I2C_ERROR_AF) == HAL_I2C_ERROR_AF) {
+          ret = I2C_NACK_DATA;
+        } else if (err != HAL_I2C_ERROR_NONE) {
+          ret = I2C_ERROR;
+        }
       }
     }
   }
@@ -784,7 +788,7 @@ i2c_status_e i2c_slave_write_IT(i2c_t *obj, uint8_t *data, uint16_t size)
 
   // Protection to not override the TxBuffer
   if (size > I2C_TXRX_BUFFER_SIZE) {
-    ret = I2C_ERROR;
+    ret = I2C_DATA_TOO_LONG;
   } else {
     // Check the communication status
     for (i = 0; i < size; i++) {
@@ -832,8 +836,12 @@ i2c_status_e i2c_master_read(i2c_t *obj, uint8_t dev_address, uint8_t *data, uin
     if ((delta > I2C_TIMEOUT_TICK)
         || ((err & HAL_I2C_ERROR_TIMEOUT) == HAL_I2C_ERROR_TIMEOUT)) {
       ret = I2C_TIMEOUT;
-    } else if (err != HAL_I2C_ERROR_NONE) {
-      ret = I2C_ERROR;
+    } else {
+      if ((err & HAL_I2C_ERROR_AF) == HAL_I2C_ERROR_AF) {
+        ret = I2C_NACK_DATA;
+      } else if (err != HAL_I2C_ERROR_NONE) {
+        ret = I2C_ERROR;
+      }
     }
   }
   return ret;
@@ -855,13 +863,13 @@ i2c_status_e i2c_IsDeviceReady(i2c_t *obj, uint8_t devAddr, uint32_t trials)
       ret = I2C_OK;
       break;
     case HAL_TIMEOUT:
-      ret = I2C_TIMEOUT;
+      ret = (obj->handle.State != HAL_I2C_STATE_READY) ? I2C_TIMEOUT : I2C_NACK_ADDR;
       break;
     case HAL_BUSY:
-      ret = I2C_BUSY;
+      ret = (obj->handle.State != HAL_I2C_STATE_READY) ? I2C_BUSY : I2C_NACK_ADDR;
       break;
     default:
-      ret = I2C_TIMEOUT;
+      ret = (obj->handle.State != HAL_I2C_STATE_READY) ? I2C_ERROR : I2C_NACK_ADDR;
       break;
   }
   return ret;

cores/arduino/stm32/twi.h

@@ -115,9 +115,12 @@ struct i2c_s {
 ///@brief I2C state
 typedef enum {
   I2C_OK = 0,
-  I2C_TIMEOUT = 1,
-  I2C_ERROR = 2,
-  I2C_BUSY = 3
+  I2C_DATA_TOO_LONG = 1,
+  I2C_NACK_ADDR = 2,
+  I2C_NACK_DATA = 3,
+  I2C_ERROR = 4,
+  I2C_TIMEOUT = 5,
+  I2C_BUSY = 6
 } i2c_status_e;
 
 /* Exported functions ------------------------------------------------------- */

libraries/Wire/src/Wire.cpp

@@ -100,13 +100,13 @@ void TwoWire::begin(int address, bool generalCall)
 
 void TwoWire::end(void)
 {
+  i2c_deinit(&_i2c);
   free(txBuffer);
   txBuffer = nullptr;
   txBufferAllocated = 0;
   free(rxBuffer);
   rxBuffer = nullptr;
   rxBufferAllocated = 0;
-  i2c_deinit(&_i2c);
 }
 
 void TwoWire::setClock(uint32_t frequency)
@@ -237,11 +237,20 @@ uint8_t TwoWire::endTransmission(uint8_t sendStop)
     // transmit buffer (blocking)
     switch (i2c_master_write(&_i2c, txAddress, txBuffer, txBufferLength)) {
       case I2C_OK :
-        ret = 0;
+        ret = 0; // Success
         break;
-      case I2C_TIMEOUT :
+      case I2C_DATA_TOO_LONG :
         ret = 1;
         break;
+      case I2C_NACK_ADDR:
+        ret = 2;
+        break;
+      case I2C_NACK_DATA:
+        ret = 3;
+        break;
+      case I2C_TIMEOUT:
+      case I2C_BUSY:
+      case I2C_ERROR:
       default:
         ret = 4;
         break;