AnsweredAssumed Answered

STM32L151 SPI1 Problem

Question asked by prabhu.arul.001 on Jan 12, 2013
Hi clive,
I have a started a new thread for discussion about SPI1 problem in STM32L151.
I used PA4-A7 for SPI1
This is my SPI configuration code,
My system clock is HSE  and it is 8MHZ.
There is a continuous reset happens when the SPI transfer starts,
Can anyone find the problem,
void RCC_config(void)
 {
    ErrorStatus HSEStartUpStatus;

    /* RCC system reset(for debug purpose) */
    RCC_DeInit();

    /* Enable HSE */
    RCC_HSEConfig(RCC_HSE_ON);

    /* Wait till HSE is ready */
    HSEStartUpStatus = RCC_WaitForHSEStartUp();

    if (HSEStartUpStatus == SUCCESS)
    {
        /* HCLK = SYSCLK */
        RCC_HCLKConfig(RCC_SYSCLK_Div1);

        /* PCLK2 = HCLK */
        RCC_PCLK2Config(RCC_HCLK_Div2);

        /* PCLK1 = HCLK/2 */
        RCC_PCLK1Config(RCC_HCLK_Div2);
            
            
            


           PWR_VoltageScalingConfig(PWR_VoltageScaling_Range1);
   

       RCC_PLLCmd(DISABLE);
 
       /* Wait till HSE is ready */
        while (RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET)
        {
        }
         RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);     // 8MHz   
        /* Wait till HSE is used as system clock source */
        while (RCC_GetSYSCLKSource() != 0x08)
        {
        }
      
     
      
      RCC_AHBPeriphClockCmd ( RCC_AHBPeriph_GPIOA|RCC_AHBPeriph_GPIOB, ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 , ENABLE);
 }
}

SPI configuration code:
 GPIO_InitTypeDef  GPIO_InitStructure;
  SPI_InitTypeDef   SPI_InitStructure;
    
    SPI_I2S_DeInit(SPI1);

     
    
      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
    
    
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_DOWN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
    
    
    
    
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
    
    GPIO_SetBits(GPIOA, GPIO_Pin_4);
    
        
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);

 
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);

 
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);
 

 

 
    
  /*!< SD_SPI Config */
  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_128;

  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI1, &SPI_InitStructure);
 
  SPI_Cmd(SPI1, ENABLE);

Outcomes