USART

A minimal UART setup can be achieved by setting up the Starter Project. This section will introduce some advanced concepts like interrupt and DMA transfer.

1. Interrupt

2. DMA

Note: sometimes CUBEIDE will put the DMAinit() code after the UART_init code in the autogenerated section. If this happens, UART will not work!

We need to manually move the DMA_init() piece to the top.

HAL_UARTEx_RxEventCallback

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