STM32学习笔记---SST25VF016BSPI实验

继做了CAN实验后，继续进行第16个实验-SST25VF016BSPI实验,此实验利用SPI1来调试2M的FLASH-SST25VF016B,通过向SST写入特定的一个字符串后，然后再读出来，最后一一判断，如果没有差错的话，就证明是正确的了，否则就写入出现错误了。正确了就在串口终端上显示字符串信息，还有板子上LED3亮。
//++++++++++++写使能 +++++++++++++++++
void wen(void)
{
 Select_Flash();
 SPI_Flash_SendByte(0x06);
 NotSelect_Flash();
}

//+++++ +++++++ 写禁止 ++++++++++++++++++
void wdis(void)
{

 Select_Flash();
 SPI_Flash_SendByte(0x04);
 NotSelect_Flash();
 wip();
 
} 
//+++++++++++++++++++++++++++++++
void wsr(void)
{ 
 Select_Flash();
 SPI_Flash_SendByte(0x50);
 NotSelect_Flash();
 //Delay(0xff);
 Select_Flash();
 SPI_Flash_SendByte(0x01);
 SPI_Flash_SendByte(0x00);
 NotSelect_Flash();
    wip();
 
}

//++++++++++ 忙检测 +++++++++
void wip(void)
{
 unsigned char a=1;
 while((a&0x01)==1) a=rdsr(); 

}
//++++++++++++++++++++++++++++++++
unsigned char rdsr(void)
{
 unsigned char busy;
 Select_Flash();
 SPI_Flash_SendByte(0x05);
 busy = SPI_Flash_ReadByte();
 NotSelect_Flash();
 return(busy);
 
}
           
//+++++++++++++字节写入+++++++++++++++++++++++
void bw1(unsigned long a1,unsigned char a2)
{
 wsr();  
    wen(); 
 Select_Flash();  
 SPI_Flash_SendByte(0x02);
 SPI_Flash_SendByte((a1&0xffffff)>>16);
 SPI_Flash_SendByte((a1&0xffff)>>8);
 SPI_Flash_SendByte(a1&0xff);
 SPI_Flash_SendByte(a2); 
 NotSelect_Flash();
 wip();        
 wdis();
 
}

//+++++++++字节读++++++++++++++++++++++++++++
unsigned char br1(unsigned long a1)
{
 unsigned char i;
 Select_Flash();
    SPI_Flash_SendByte(0x03);
 SPI_Flash_SendByte((a1&0xffffff)>>16);
 SPI_Flash_SendByte((a1&0xffff)>>8);
 SPI_Flash_SendByte(a1&0xff);
 i=SPI_Flash_ReadByte(); 
 NotSelect_Flash();
 return(i);
}

//++++++++++连续读++++++++++++++++++++++++++++
void r_sect(unsigned long a)
{
 unsigned int i;
 Select_Flash();
 SPI_Flash_SendByte(0x03);
 SPI_Flash_SendByte((a&0xffffff)>>16);
 SPI_Flash_SendByte((a&0xffff)>>8);
 SPI_Flash_SendByte(a&0xff);
 for(i=0; i<816; i++){ 
  SST25_buffer[i]=SPI_Flash_ReadByte();
 }
 NotSelect_Flash();
}

//+++++++++++++连续写入+++++++++++++++++++++++
void w_sect(unsigned long a1)
{
 unsigned int i=0,a2;
 
 wsr();
   wen();
 Select_Flash();   
 SPI_Flash_SendByte(0xad);
 SPI_Flash_SendByte((a1&0xffffff)>>16);
 SPI_Flash_SendByte((a1&0xffff)>>8);
 SPI_Flash_SendByte(a1&0xff);
   SPI_Flash_SendByte(SST25_buffer[0]);
 SPI_Flash_SendByte(SST25_buffer[1]);
 NotSelect_Flash();
 i=2;
 while(i<4096){
  a2=130;
  while(a2>0) a2--;
  Select_Flash();
  SPI_Flash_SendByte(0xad);
  SPI_Flash_SendByte(SST25_buffer[i++]);
  SPI_Flash_SendByte(SST25_buffer[i++]);
  NotSelect_Flash();
 }
 
 a2=130;
 while(a2>0) a2--;
 wdis(); 
 Select_Flash(); 
 wip(); 
 
}
//++++++++++块读++++++++++++++++++++++++++++
void SST25_R_BLOCK(uint32_t addr, u8 *readbuff, uint16_t BlockSize)
{
 unsigned int i=0;
 Select_Flash();
 SPI_Flash_SendByte(0x03);
 SPI_Flash_SendByte((addr&0xffffff)>>16);
 SPI_Flash_SendByte((addr&0xffff)>>8);
 SPI_Flash_SendByte(addr&0xff);
 while(i  readbuff[i++]=SPI_Flash_ReadByte();
 }
 NotSelect_Flash();
}
//+++++++++++++块写入+++++++++++++++++++++++
void SST25_W_BLOCK(uint32_t addr, u8 *readbuff, uint16_t BlockSize)
{
 unsigned int i=0,a2;
 sect_clr(addr);    //清除addr开始的4096个字节的块
 wsr();
   wen();
 Select_Flash();   
 SPI_Flash_SendByte(0xad);
 SPI_Flash_SendByte((addr&0xffffff)>>16);
 SPI_Flash_SendByte((addr&0xffff)>>8);
 SPI_Flash_SendByte(addr&0xff);
   SPI_Flash_SendByte(readbuff[0]);
 SPI_Flash_SendByte(readbuff[1]);
 NotSelect_Flash();
 i=2;
 while(i  a2=130;
  while(a2>0) a2--;
  Select_Flash();
  SPI_Flash_SendByte(0xad);
  SPI_Flash_SendByte(readbuff[i++]);
  SPI_Flash_SendByte(readbuff[i++]);
  NotSelect_Flash();
 }
 
 a2=130;
 while(a2>0) a2--;
 wdis(); 
 Select_Flash(); 
 wip(); 
 
}
//++++++++++++++++++++++++++++++++
void sect_clr(unsigned long a1)
{
 //wen();
 
 wsr();
 wen();    
 Select_Flash();

 SPI_Flash_SendByte(0x20);
 SPI_Flash_SendByte((a1&0xffffff)>>16);          //addh
 SPI_Flash_SendByte((a1&0xffff)>>8);          //addl
 SPI_Flash_SendByte(a1&0xff);          //wtt
 NotSelect_Flash();
 wip();
 
}

//========读器件厂家信息
void FlashReadID(void)
{

 Select_Flash(); 
   SPI_Flash_SendByte(0x90);
 SPI_Flash_SendByte(0x00);
 SPI_Flash_SendByte(0x00);
 SPI_Flash_SendByte(0x00);
   fac_id= SPI_Flash_ReadByte();   //BFH: SST
 dev_id= SPI_Flash_ReadByte();      //41H:SST25VF016B
 
   NotSelect_Flash(); 
}

**************************

//测试SST25VF016B-SPI
void TEST_SST25VF016BSPI(void)
{ 
   uint8_t a=0;
   uint16_t i=0;

  for(i=0; i 
  SST25_W_BLOCK(0, SST25_buffer,4096);    //写入0页的数据
  Delay(0xffff);
  SST25_R_BLOCK(0, SST25_buffer,4096);    //读出0页的数据
  a=0;
  for(i=0; i  {
   if(SST25_buffer[i]==TxBuffer1[i]) a=1;   //和原始数据进行比较， 以判别是否读写正常
 else {a=0; i=TxBufferSize1;}
  }
 
  if(a==1) {
   GPIO_SetBits(GPIOD, GPIO_Pin_3);           //读写正确LED1 亮
   USART_TX(USART1,&SST25_buffer[0]);  
  }

}

以下为结果演示：