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proc9
proc9
Associate II
August 28, 2015
Question

STM32F103 Hardware NSS solution

  • August 28, 2015
  • 2 replies
  • 686 views
Posted on August 29, 2015 at 00:01

Hello.

I'm having problems with STM32F103 SPI peripheral. On STM32F072 I could have proper transmission with hardware NSS management, but on STM32F103 it is just pulled low and it stays like that.

Is there any solution for that?
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    2 replies

    stm32forum
    stm32forum
    Associate III
    August 29, 2015
    Posted on August 29, 2015 at 21:07

    Maybe you can shine a light on what spi port your using, maybe some used pins and preferably some code snips.

    proc9
    proc9Author
    Associate II
    August 29, 2015
    Posted on August 30, 2015 at 00:42

    Of course. I'm using SPI1 and its PA4 PA5 PA6 and PA7.

    I'm initializing SPI with that code:

    RCC->APB2ENR |= RCC_APB2ENR_SPI1EN;

    SPI1->CR2 = SPI_CR2_SSOE;

    SPI1->CR1 = SPI_CR1_MSTR | SPI_CR1_BR_2 | SPI_CR1_SSI | SPI_CR1_SPE;
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