I am using I2C interface in master mode to collect data from external slave device with DMA in non-blocking mode.
My program is working fine since I get correct data.
BUT I would like to get an event that the exchanges are completed by registering these functions during INIT step :
- // HAL Register DMA Tx Transfer events
HAL_DMA_RegisterCallback(dmaHandleTx, HAL_DMA_XFER_CPLT_CB_ID, i2cTransmitFullCallback)
- // HAL Register DMA Rx Transfer events
HAL_DMA_RegisterCallback(dmaHandleRx, HAL_DMA_XFER_CPLT_CB_ID, i2cReceiveFullCallback)
When I run my program, I get DMA interrupt in below function but no callback call is triggered.
I tried to look carefully inside the HAL itself and I found something quite strange from my understanding.
HAL_I2C_Master_Transmit_DMA(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint8_t *pData, uint16_t Size)
/* Set the I2C DMA transfer complete callback */
hi2c->hdmatx->XferCpltCallback = I2C_DMAMasterTransmitCplt;
/* Set the DMA error callback */
hi2c->hdmatx->XferErrorCallback = I2C_DMAError;
/* Set the unused DMA callbacks to NULL */
hi2c->hdmatx->XferHalfCpltCallback = NULL;
hi2c->hdmatx->XferAbortCallback = NULL;
/* Enable the DMA channel */
HAL_DMA_Start_IT(hi2c->hdmatx, (uint32_t)pData, (uint32_t)&hi2c->Instance->TXDR, hi2c->XferSize);
If the Callback function pointer is initialize at each call of HAL_I2C_Master_Transmit_DMA function with internal I2C_DMAMasterTransmitCplt, how it manages my registered callback in INIT step (i2cTransmitFullCallback) ?
Does anyone has an idea about this ?
Thanks a lot.