19. Transmitter_receiver_int

19.1. Function description:

Set the watermark depth of TX of USARTn and USARTm to 1, that is, the reception interrupt will be generated at the beginning (the interrupt generation condition is that the interrupt will be generated when the data in TX is less than the set depth).If there is data in Rx, a watermark interrupt is generated to save the data.

19.2. Test result:

If the data written to USARTn TX is same to data read from USARTm RX, and the data written to USARTm TX is same to data read from USARTn RX, print “pass”, if not, print “fail”.

19.3. IO connection:

PAD	PAD
pad_USARTn_TX	pad_USART1_RX
pad_USARTn_RX	pad_USART1_TX

Note

The ‘m’ and ‘n’ in “usartm” and “usartn” indicate the peripheral number.