SPI_DMA Slave Receive only after reset

Thanks for replyI tried clean buffer same problemNo problem with groundWhen I use spi polling no DMA it is OK which mean there something with timing I do not know

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On Fri, Jun 15, 2018 at 11:55 AM, T J<st-microelectronics@jiveon.com> wrote:

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Re: SPI_DMA Slave Receive only after reset

reply from T J in STM32 MCUs Forum - View the full discussion

there is no time sync, the input clock bits are counted to 8 then the data is latched.

I guess you are clearing the Rx buffer

// initialise by clearing residual bytes in DR

while ((hspi1.Instance->SR & SPI_FLAG_RXNE))

RxSPI = hspi1.Instance->DR;

// wait for next Rx

while ((hspi1.Instance->SR & SPI_FLAG_RXNE)) ;

RxSPI = hspi1.Instance->DR; // have new byte //should save to buffer

otherwise you may have a poor ground between your SPI device and the F7

can you check the clock line is going to ground on a scope connected to the F746 ground.?

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