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STM32MP1 support available in SW4STM32

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STM32F1 SPI Simpleton Implementation Fail

France

Hi Ben,

First of all you should check that in your project settings at “project >> C/C++ Build >> Settings >> Tool Settings >> MCU GCC Compiler >> Warnings” the “All Warnings (-Wall)” option is checked. This will gives you warnings on potential errors you may have in your code.

Second, there is indeed several problems in your code:

  1. You do not need any parentheses in (pData) = ; you can write it simply as pData =
  2. pData, as its name implies, should be a pointer to uint8_t data (bytes);
    1. You should declare it as uint8_t *pData;
    2. Then you cannot assign it a byte, you must assign it the address of a byte, by pData = &TheDataItself;
    3. Finally you can pass to HAL_SPI_Transmit either pData or &TheDataItself, both will request HAL to transmit 1 byte of data (value of cnt), located in the TheDataItself variable
Probably the cleaner way to transmit a byte on the SPI would be to write:
uint8_t TheDataItself = 0xFF;
HAL_SPI_Transmit(&hspi2, &TheDataItself, sizeof(TheDataItself), 10); // 10 is the time out value.

Finally, I think you should read one of the numerous C programming courses you can find on the web: whatever it may look like, C is not a simple programming language, especially when going to pointers, and you need some guidance when starting to program in C.

Hope this helps clarifying things,

Bernard (Ac6)