How to transmit hex data over spi?

Forum|Forum|5 years ago
June 27, 2021
3 replies
1640 views

I want to transfer binary data (not character) without having to worry about character conversion, so directly:

uint8_t data = 0xBF;

HAL_SPI_Transmit(&spi1handle, (uint8_t *) data, 1, 1000);

But I get something else at the receive end, specifically I get for example 0xDC so not the same data that I send. As a beginner I would like to know how I can make the above work.

SPI

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Tesla DeLorean

Guru

This was the correct approach.

You need to double check clocking and phase options at both ends.

>>But I get something else at the receive end.

Unfortunately you don't state what. Perhaps shifted one bit left or right?

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TDK

Note that SPI needs a method to synchronize bytes, typically through use of a CS pin.

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Dian.1Author

Associate

@Community member @TDK Do I need to do something with the bits at the receive ends? I expect that if I send 8 bits which is 0xBF , I receive those 8 bits (configured it for 8 bits data). I will try again, how can I best debug this kind of problem?

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