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SPI Problem in STM32F215

Question asked by p.thirukkannan on Jun 28, 2014
Latest reply on Jun 28, 2014 by Clive One
Hi,

I have written code for configuration and Data_send for SPI in stm32f215 like below mentioned code. I have monitor the  clk,data,CS while running using CRO, i am getting CLK,Data but not getting CS. What is the problem please clear me.
Below is code.

int main()
{

SPI_Config();
while()
{
SPI_I2S_SendData( SPI1, 0x55);
}
}


static void SPI_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    /* Peripheral Clock Enable -------------------------------------------------*/
    /* Enable the SPI clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

    /* Enable GPIO clocks */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    /* SPI GPIO Configuration --------------------------------------------------*/
    /* Connect SPI pins to AF5 */  
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource4, GPIO_AF_SPI1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_DOWN;

    /* SPI SCK pin configuration */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* SPI  MOSI pin configuration */
    GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_5;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* SPI SCK pin configuration */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* SPI  MOSI pin configuration */
    GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_7;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* SPI configuration -------------------------------------------------------*/
    SPI_I2S_DeInit(SPI1);
    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;

    /* Configure the Priority Group to 1 bit */                
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

    /* Configure the SPI interrupt priority */
    NVIC_InitStructure.NVIC_IRQChannel = SPI1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_Init(SPI1, &SPI_InitStructure);

    /* The Data transfer is performed in the SPI interrupt routine */
    /* Enable the SPI peripheral */
    SPI_Cmd(SPI1, ENABLE);
}

Regards,
Thirukkannan.P



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