main.c

STM32 SPI通信

#include <stm32f10x_lib.h>   
//#include <stdio.h>
FlagStatus SPI_I2S_GetFlagStatus(SPI_TypeDef* SPIx, uint16_t SPI_FLAG)/*检查指定的SPI标志位设置与否*/
 {
 FlagStatus bitstatus = RESET;
  /* Check the parameters */
 assert_param(IS_SPI_ALL_PERIPH(SPIx));
 assert_param(IS_SPI_GET_FLAG(SPI_FLAG));
  /* Check the status of the specified SPI/I2S flag */
 if ((SPIx->SR & SPI_FLAG) != (uint16_t)RESET)
  {
    /* SPI_I2S_FLAG is set */
   bitstatus = SET;
 }
 else
 {
    /* SPI_I2S_FLAG is reset */
    bitstatus = RESET;
  }
  /* Return the SPI_I2S_FLAG status */
  return  bitstatus;
 }


 uint8_t SPI_FLASH_SendByte(uint8_t byte)
{
  /* Loop while DR register in not emplty */
  while (SPI_I2S_GetFlagStatus(SPI_FLASH, SPI_I2S_FLAG_TXE) == RESET);

  /* Send byte through the SPI1 peripheral */
  SPI_SendData(SPI_FLASH, byte);

  /* Wait to receive a byte */
  while (SPI_I2S_GetFlagStatus(SPI_FLASH, SPI_I2S_FLAG_RXNE) == RESET);

  /* Return the byte read from the SPI bus */
  return SPI_ReceiveData(SPI_FLASH);
}


/**********************************************************************
* 名    称：Delay()
* 功    能：延时
* 入口参数：cnt
* 出口参数：
-----------------------------------------------------------------------
* 说明：
***********************************************************************/
void Delay(u16 cnt) {
u16 i,j;
for (i=0;i<cnt;i++)
{ for (j=0;j<1000;j++)
  { }
 }
}

 /**********************************写使能**********************************************/
   void writeEnable(void)				  
{
  SPI_FLASH_CS_LOW();
  SPI_FLASH_SendByte(CMD_WREN);
  SPI_FLASH_CS_HIGH();
}

/**********************发送数据到指点地址***************************/
void writedate(unsigned int addr,unsigned char date)		
{ unsigned char addh;
  addh=(addr&0xff00)>>5;
  writeEnable(); 
  SPI_FLASH_CS_LOW();
  SPI_FLASH_SendByte(0x02|addh);
  SPI_FLASH_SendByte(addr&0x00ff);
  //SPI_FLASH_SendByte(0xA5)
  SPI_FLASH_SendByte(date);	
  SPI_FLASH_CS_HIGH();
}
/*************************************读一个指定地址的数******************************************/

unsigned char readdat(unsigned int addr)          
{
  unsigned char temp,addh;
  addh=(addr&0xff00)>>5;
  SPI_FLASH_CS_LOW();  
  SPI_FLASH_SendByte(0x03|addh);	
  SPI_FLASH_SendByte(addr&0x00ff);						
  temp=SPI_FLASH_SendByte(0xA5);			
  SPI_FLASH_CS_HIGH();
  return temp;  
}



int main(void)
 {	
   u8 date;
   GPIO_InitTypeDef  GPIO_InitStructure;
   SPI_InitTypeDef	  SPI_InitStructure;
   //SystemInit();
	 
	 RCC_APB2PeriphClockCmd(SPI_FLASH_CLK | SPI_FLASH_GPIO_CLK, ENABLE);
	 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
  /* Configure SPI pins: SCK, MISO and MOSI */
  GPIO_InitStructure.GPIO_Pin = SPI_FLASH_PIN_SCK | SPI_FLASH_PIN_MISO | SPI_FLASH_PIN_MOSI;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
  GPIO_Init(SPI_FLASH_GPIO, &GPIO_InitStructure);  
	  
  GPIO_InitStructure.GPIO_Pin = SPI_FLASH_CS;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(SPI_FLASH_CS_GPIO, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  SPI_Cmd(SPI_FLASH, DISABLE);  


  /* SPI 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_2;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;			  
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI_FLASH, &SPI_InitStructure);


  /* Enable the SPI  */
  SPI_Cmd(SPI_FLASH, ENABLE);
   
   writedate(0,0x38);  

    date=readdat(0);   
   //	 date=0x32;
 /*判断接收与发送数据是否相等*/
  	while(date==0x38)
	{
  	GPIO_SetBits(GPIOC, GPIO_Pin_11);
	break;
  	 }
}