3. Dma_send_cpu_receive

3.1. Function description:

This demo is dma_send_cpu_receive, test with two groups of USARTn , configure TX as dma_send, Rx is configured as cpu_receive.

3.2. Test result:

This dmo show USARTn_TX and USARTm_TX send data, USARTn_RX and USARTm_RX receive data,if USARTn_TX send data equals USARTn_RX receive data or USARTm_TX send data equals USARTn_RX receive data, print “pass”,if not, print “fail”.

3.3. IO connection:

PAD	PAD
pad_USARTn_TX_DMA	pad_USARTm_RX_CPU
pad_USARTn_RX_CPU	pad_USARTm_TX_DMA

Note

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