• State Not Answered
  • Locked Locked
  • Replies 12 replies
  • Subscribers 21 subscribers
  • Views 5698 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Getting SPI to work

Kolijn Wolfaardt

Hi, I'm using a MCBSTM32E board, with a ST32E103ZE Arm Cortex M3 processor. I am trying to get the SPI interface to work, but so far I've had no luck.

I've tried simulating, and capturing the pin outputs with an oscilloscope, but I get no output.

Relevant code:

void M_SPIInit(void)
{
        SPI_InitTypeDef SPI_InitStructure;

        // SPI1 configuration
        SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
        SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
        SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
        SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
        SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
        SPI_InitStructure.SPI_NSS = SPI_NSS_Hard;
        SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
        SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
        SPI_InitStructure.SPI_CRCPolynomial = 7;
        SPI_Init(SPI1, &SPI_InitStructure);
}

int main (void)
{
        stm32_Init();
        M_SPIInit();
        SPI_Cmd(SPI1, ENABLE);
        SPI_I2S_SendData(SPI1,word);
}

Parents
  • 0 in reply to Andy Neil

    I have tried setting NSS to Software, but no change.

    I have configured the GPIOs like this:

    NSS - Floating input
    SCK - Alternate Function Push-pull (Max 50 MHz)
    MISO - Floating input
    MOSI - Alternate Function Push-pull (Max 50 MHz)

    I have no idea which clocks to set, I'm using their configuration wizard. They are set (as far as I can tell) like this:

    External Clock Enabled (8 MHz)
    PLL Enabled, 8 times multiplier and does not exceed maximum of 72 MHz.
    PLL source : HSE clock
    PLLXTPRE : HSE
    System Clock switch : PLL clock

Reply
  • 0 in reply to Andy Neil

    I have tried setting NSS to Software, but no change.

    I have configured the GPIOs like this:

    NSS - Floating input
    SCK - Alternate Function Push-pull (Max 50 MHz)
    MISO - Floating input
    MOSI - Alternate Function Push-pull (Max 50 MHz)

    I have no idea which clocks to set, I'm using their configuration wizard. They are set (as far as I can tell) like this:

    External Clock Enabled (8 MHz)
    PLL Enabled, 8 times multiplier and does not exceed maximum of 72 MHz.
    PLL source : HSE clock
    PLLXTPRE : HSE
    System Clock switch : PLL clock

Children