Associate the initialized DMA handle to the USART DMA Tx/Rx handle.
Configure the priority and enable the NVIC for the transfer complete interrupt
on the DMA Tx/Rx Stream.
3. Program the Baud Rate, Word Length, Stop Bit, Parity, Hardware flow control and
Mode(Receiver/Transmitter) in the husart Init structure.
4. Initialize the USART registers by calling the HAL_USART_Init() API:
These APIs configures also the low level Hardware GPIO, CLOCK,
CORTEX...etc) by calling the customized HAL_USART_MspInit(&husart) API.
The specific USART interrupts (Transmission complete interrupt, RXNE interrupt
and Error Interrupts) will be managed using the macros
__HAL_USART_ENABLE_IT() and __HAL_USART_DISABLE_IT() inside the
transmit and receive process.
5. Three operation modes are available within this driver :
Polling mode IO operation
Send an amount of data in blocking mode using HAL_USART_Transmit()
Receive an amount of data in blocking mode using HAL_USART_Receive()
Interrupt mode IO operation
Send an amount of data in non blocking mode using HAL_USART_Transmit_IT()
At transmission end of transfer HAL_USART_TxHalfCpltCallback is executed and
user can add his own code by customization of function pointer
HAL_USART_TxCpltCallback
Receive an amount of data in non blocking mode using HAL_USART_Receive_IT()
At reception end of transfer HAL_USART_RxCpltCallback is executed and user can
add his own code by customization of function pointer HAL_USART_RxCpltCallback
In case of transfer Error, HAL_USART_ErrorCallback() function is executed and user
can add his own code by customization of function pointer
HAL_USART_ErrorCallback
DMA mode IO operation
Send an amount of data in non blocking mode (DMA) using
HAL_USART_Transmit_DMA()
At transmission end of half transfer HAL_USART_TxHalfCpltCallback is executed and
user can add his own code by customization of function pointer
HAL_USART_TxHalfCpltCallback
At transmission end of transfer HAL_USART_TxCpltCallback is executed and user
can add his own code by customization of function pointer
HAL_USART_TxCpltCallback
Receive an amount of data in non blocking mode (DMA) using
HAL_USART_Receive_DMA()
At reception end of half transfer HAL_USART_RxHalfCpltCallback is executed and
user can add his own code by customization of function pointer
HAL_USART_RxHalfCpltCallback
At reception end of transfer HAL_USART_RxCpltCallback is executed and user can
add his own code by customization of function pointer HAL_USART_RxCpltCallback
In case of transfer Error, HAL_USART_ErrorCallback() function is executed and user
can add his own code by customization of function pointer
HAL_USART_ErrorCallback
Pause the DMA Transfer using HAL_USART_DMAPause()
Resume the DMA Transfer using HAL_USART_DMAResume()
Stop the DMA Transfer using HAL_USART_DMAStop()
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