[STM32] [SPI] [HAL] HAL_SPI_Transmit - sending incorrect data.

Question

I came across a strange behavior of the HAL_SPI_Transmit function below the code:

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And according to what above, this part of the program should send 3 bytes of data with a value of 200 (DEC) and send 225 look at the attached waveforms. The first byte doesn't even get decoded by Saleae Logic.

Anonymous · Answer

Give yourself the parameters in logic it will decode it for you. Everything works. The edge and polarization - this is set in the transmission parameters.

Freddie Chopin · Answer

I wonder why the compiler reports warning (*) on absolutely EVERY call to HAL_SPI_Transmit ()? Well, really interesting what he means ... Probably nothing worth stupid, so who cares there ... Any type mismatch or "pointer from integer"? Flight? Szprechen zi polnish, herr compiler?

Do you think it would be possible to ask the administrators to take a short programming test before posting a new topic on this forum?

* - another advantage of C ++ - such stupid code in this language simply wouldn't compile and that's it.

Anonymous · Answer

I do not know if you remember, but a few months ago there was also such a strong man here who ignored the ones underlined in red and decided that it was a gcc error because he is still loading the old version of the program, and he has already thrown the flashing diode - and it flashes . So not compiling the program always doesn't help

rafiks · Answer

# Piotrus_999 It's not about rearranging settings in the logic program. Only that this transmit function does not send what we give. In the attachment I am sending two pictures, one where the value is 200 (spi with avr xmegi) and the other (with stm32) another waveform. I've already tried different SPI settings CPOL = LOW LSB First / MSB First and I'm not able to get the value 200.

Anonymous · Answer

I don't mean to be mean, but Freddy wrote you. Do you read the warnings, do you consider them unnecessary to return the guitar?

HAL_StatusTypeDef HAL_SPI_Transmit (SPI_HandleTypeDef * hspi, uint8_t * pData, uint16_t Size, uint32_t Timeout)

And for you pData is uint8_ and not uint8_t * this is how it should work.

How is it supposed to work?

Freddie Chopin · Answer

After all, you can clearly see that the latter. This function sends exactly what you gave it. But it's not 200. The compiler told you about it - with messages with a yellow background.

rafiks · Answer

I did not notice that there is an asterisk there, i.e. an indicator, and not data. I've already ticked All warnings -Wall and now I can see a list of all warnings. Thank you for your help

[STM32] [SPI] [HAL] HAL_SPI_Transmit - sending incorrect data.

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