原创 STM32 SPI初始化函数 非使用STM32库方式

netjob @2008

http://bbs.21ic.com/club/bbs/bbsView.asp?

//=============================================================================
//
//=============================================================================
void STM32_SPI_Configuration(void)
{
      //SPI_InitTypeDef  SPI_InitStructure;
      //GPIO_InitTypeDef GPIO_InitStructure;
  
        /* Enable SPI1 and GPIOA clocks */
       // RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
   STM32_Rcc_Regs->apb2enr.all|=RCC_SPI1EN;   // 时钟使能 
 
      /* Configure SPI1 pins: NSS, SCK, MISO and MOSI */
      //GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
      //GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      //GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      //GPIO_Init(GPIOA, &GPIO_InitStructure);
 STM32_Gpioa_Regs->crl.bit.CNF5=Output_Af_push_pull;
 STM32_Gpioa_Regs->crl.bit.MODE5=Output_Mode_50mhz;
 
        STM32_Gpioa_Regs->crl.bit.CNF6=Output_Af_push_pull;
 STM32_Gpioa_Regs->crl.bit.MODE6=Output_Mode_50mhz;
       
 STM32_Gpioa_Regs->crl.bit.CNF7=Output_Af_push_pull;
 STM32_Gpioa_Regs->crl.bit.MODE7=Output_Mode_50mhz;

      /* Configure PB.12 as Output push-pull, used as Flash Chip select */
      //GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
      //GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      //GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
      //GPIO_Init(GPIOA, &GPIO_InitStructure);
 STM32_Gpioa_Regs->crl.bit.CNF4=Output_push_pull;
 STM32_Gpioa_Regs->crl.bit.MODE4=Output_Mode_50mhz;

      /* Deselect the FLASH: Chip Select high */
        //GPIOA->BSRR = GPIO_Pin_4;
 STM32_Gpioa_Regs->bsrr.bit.BS4=1;// 置位

  /* SPI2 configuration */
  //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_High;
  //SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
  //SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
  //SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
  //SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  //SPI_InitStructure.SPI_CRCPolynomial = 7;
  //SPI_Init(SPI1, &SPI_InitStructure);
 
  STM32_Spi1_Regs->cr1.bit.BR=2;    // 72mhz/8=9mhz  010=Fpclk/8
  STM32_Spi1_Regs->cr1.bit.CPHA=1;  // 1： 数据采样从第二个时钟边沿开始
  STM32_Spi1_Regs->cr1.bit.CPOL=1;  // 1： 空闲状态时，SCK保持高电平
  STM32_Spi1_Regs->cr1.bit.DFF=0;   // 0：使用8位数据帧格式进行发送/接收
  STM32_Spi1_Regs->cr1.bit.LSBFIRST=0;   // 0：先发送MSB
  STM32_Spi1_Regs->cr1.bit.MSTR=1;       //  1：配置为主设备
  STM32_Spi1_Regs->cr1.bit.SSM=1;        //  1：启用软件从设备管理。
  STM32_Spi1_Regs->cr1.bit.BIDIMODE=0;    //0：选择“双线双向”模式
    
  /* Enable SPI1  */
  //SPI_Cmd(SPI1, ENABLE);  
  STM32_Spi1_Regs->cr1.bit.SPE=1;    //1：开启SPI设备
 
}//end sub