SPI发不出数据，软件配置查了好久没找出问题，帮忙分析下

只看该作者 · 2016-11-16 16:19

STM32F302的SPI模块数据不能发送
大家好，帮忙看下哪里出错了。
SPI引脚配置成输出可以正常输出高低电平。配置成SPI3也发送不出数据，CLK引脚没波形。

int main(void)
{
      volatile u16 delay_cnt;
   RCC_GetClocksFreq(&RCC_InitStructure);

   //系统10ms中断
   SysTickConfig();

   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB | RCC_AHBPeriph_GPIOA, ENABLE);
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

   GPIO_InitStructure.GPIO_Pin =GPIO_Pin_13;
   GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF;
   GPIO_InitStructure.GPIO_PuPd =GPIO_PuPd_DOWN;
   GPIO_InitStructure.GPIO_OType =GPIO_OType_PP;
   GPIO_InitStructure.GPIO_Speed =GPIO_Speed_Level_3;
   GPIO_Init(GPIOB, &GPIO_InitStructure);
   GPIO_PinAFConfig(GPIOB, GPIO_Pin_13, GPIO_AF_5);
   GPIO_InitStructure.GPIO_Pin =GPIO_Pin_10 | GPIO_Pin_11;
      GPIO_Init(GPIOA, &GPIO_InitStructure);
   GPIO_PinAFConfig(GPIOA, GPIO_Pin_10 | GPIO_Pin_11, GPIO_AF_5);

   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
      NVIC_InitStructure.NVIC_IRQChannel =SPI2_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =1;
   NVIC_InitStructure.NVIC_IRQChannelSubPriority =0;
   NVIC_InitStructure.NVIC_IRQChannelCmd =ENABLE;
   NVIC_Init(&NVIC_InitStructure);

   SPI_I2S_DeInit(SPI2);
   SPI_InitStructure.SPI_Mode =SPI_Mode_Master;
   SPI_InitStructure.SPI_Direction =SPI_Direction_2Lines_FullDuplex;
   SPI_InitStructure.SPI_FirstBit =SPI_FirstBit_MSB;
   SPI_InitStructure.SPI_DataSize =SPI_DataSize_8b;
   SPI_InitStructure.SPI_CPOL =SPI_CPOL_Low;
   SPI_InitStructure.SPI_CPHA =SPI_CPHA_1Edge;
   SPI_InitStructure.SPI_BaudRatePrescaler =SPI_BaudRatePrescaler_64;//SPI²¨ÌØÂÊÊµ¼Ê¶àÉÙ£¿
   SPI_InitStructure.SPI_NSS =SPI_NSS_Soft;
   SPI_InitStructure.SPI_CRCPolynomial =SPI_CRCLength_8b;//CRC ?
   SPI_Init(SPI2, &SPI_InitStructure);
//    SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_RXNE, ENABLE);
   SPI_Cmd(SPI2, ENABLE);

      while (1)
      {
               if(Flag_10ms ==1)
   {
   Flag_10ms =0;
//    SPI2->SR &=(~0x02);
   SPI2->DR =0x33;
   }
      }
}
void SysTickConfig(void)
{
//Setup SysTick Timers for 10ms interrupt
if(SysTick_Config(RCC_InitStructure.SYSCLK_Frequency /100))
{
//Capture error
while(1);
}
//Configure the SysTick handler priority
NVIC_SetPriority(SysTick_IRQn, 0);
}

只看该作者 · 2016-11-17 16:58

找出原因了，
将
GPIO_PinAFConfig(GPIOA, GPIO_Pin_10 | GPIO_Pin_11, GPIO_AF_5);
改为
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_5);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource11, GPIO_AF_5);