stm32f103 SPI DMA both master and slave implementation

838445810 · ‎2014-07-01

Posted on July 01, 2014 at 19:03

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838445810 · ‎2014-07-02

Posted on July 03, 2014 at 03:23

hi,

The configuration is fine.

The point is enable both dma rx and tx.And the master needs to do the PTX(primary transition) providing the clk meanwhile the slave have data avalible in buffer.

Now I have another issue.

The length of message on both side is dynamic. If the length of PTX is different. The receive data would be cut or having a tail like the following case:

master PTX: ABCDEFG

slave PTX: 123

result:

master receiveï¼š1233333

slave receiveï¼š ABCDEFG

Any input would be help. Many thanks.