extern I2C_HandleTypeDef hi2c1;
uint8_t rxData[8] = {0, 0, 0, 0, 0, 0, 0, 0};
uint8_t txData[8] = {0, 0, 0, 0, 0, 0, 0, 0};
uint8_t newData = 0;
uint8_t rxCount = 0;
uint8_t txCount = 0;
void HAL_I2C_ListenCpltCallback(I2C_HandleTypeDef *hi2c){
HAL_I2C_EnableListen_IT(&hi2c1);
}
void HAL_I2C_AddrCallback(I2C_HandleTypeDef *hi2c, uint8_t TransferDirection, uint16_t AddrMatchCode){
// See if I2C transactions are still operating
HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);
if(TransferDirection == I2C_DIRECTION_TRANSMIT){
// Reset transfer counter
rxCount = 0;
// Receive first byte
HAL_I2C_Slave_Sequential_Receive_IT(hi2c, rxData+rxCount, 1, I2C_FIRST_FRAME);
}
else{
// Send first byte
txCount = 0;
HAL_I2C_Slave_Seq_Transmit_IT(hi2c, txData+txCount, 1, I2C_FIRST_FRAME);
}
}
void HAL_I2C_SlaveTxCpltCallback(I2C_HandleTypeDef *hi2c){
// Transmit following bytes of data after 1st
txCount++;
HAL_I2C_Slave_Seq_Transmit_IT(hi2c, txData+txCount, 1, I2C_NEXT_FRAME);
}
void HAL_I2C_SlaveRxCpltCallback(I2C_HandleTypeDef *hi2c){
// Receive following bytes of data after 1st
rxCount++;
newData = 1;
// If isn't full
if (rxCount < RxSIZE){
if (rxCount == RxSIZE-1){
// Store last byte
HAL_I2C_Slave_Seq_Receive_IT(&hi2c1, rxData+rxCount, 1, I2C_LAST_FRAME);
}
else{
// Store next byte
HAL_I2C_Slave_Seq_Receive_IT(&hi2c1, rxData+rxCount, 1, I2C_NEXT_FRAME);
}
}
if (rxCount == RxSIZE){
// Data is now stored
}
}
void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *hi2c){
// Error handler
uint32_t errorcode = HAL_I2C_GetError(hi2c);
if (errorcode == 4){
// AF Error, data is less than maximum bytes, ignore error
__HAL_I2C_CLEAR_FLAG(hi2c, I2C_FLAG_AF);
if (txCount != 0){
txCount = txCount -1;
}
}
// Re-enable interrupts
HAL_I2C_EnableListen_IT(hi2c);
}
