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SPI clock initialisation problem

Question asked by belloc.thomas on Jun 30, 2015
Latest reply on Jun 30, 2015 by belloc.thomas
Hi everybody,
I have a problem while doing the configuration of the SPI on my stm32f051r8.
Indeed, I've written the hole initialization code but I can't see the the clock with a scope..
Can you help me?
Thank s a lot
void spi_conf()
{
 
    GPIO_InitTypeDef    GPIO_InitStructure;
    SPI_InitTypeDef   SPI_InitStructure;
 
 /* Enable SPI clock, SPI1 */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
 
 
 
  /* SPI SCK, MOSI, MISO pin configuration */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_15 | GPIO_Pin_14;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_1; // 10 MHz
  GPIO_Init(GPIOB, &GPIO_InitStructure);
 
  // Configure CS pin as output floating
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
 
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_0); // SPI1 SCK
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_0); // SPI1 MOSI
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_0); // SPI1 MISO
 
  /* SPI configuration -------------------------------------------------------*/
  SPI_I2S_DeInit(SPI2);
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
  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_4;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
 
  SPI_Init(SPI2, &SPI_InitStructure);
  SPI_SSOutputCmd(SPI2, ENABLE);
  SPI_Cmd(SPI2, ENABLE);
}
 
int main(void)
{
spi_conf();
 
    while(1)
    {
    }
}
 

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