【IoT】蓝牙BLE基础：CC254x通信系列之模拟SPI协议

CC254x 模拟 SPI：

1、宏定义：

  

   

    

     

    
    

     

      #define SPI_CS                          P1_4   
     
    
   

    

     

    
    

     

      #define SPI_CLK                         P1_5
     
    
   

    

     

    
    

     

      #define SPI_MOSI                        P1_7 
     
    
   

    

     

    
    

     

      #define SPI_MISO                        P1_6
     
    
  
 

2、引脚配置

  

   

    

     

    
    

     

      void SPI_Init(void)
     
    
   

    

     

    
    

     

      {  
     
    
   

    

     

    
    

     

          P1SEL &= 0x0F; //将 P1.4 P1.5 P1.6 P1.7 设置为GPIO引脚          00001111
     
    
   

    

     

    
    

     

          P1DIR |= 0xB0; //设置 P1.4 P1.5, p1.7 引脚为输出, P1.6为输入    10110000
     
    
   

    

     

    
    

     

      }
     
    
  
 

3、读字节函数

  

   

    

     

    
    

     

      uint8 SPI_ReadByte(void)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

          unsigned char i=0, in=0, temp=0;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          //先拉低, 然后拉高的时候, 读取MISO
     
    
   

    

     

    
    

     

          SPI_CLK = 0;
     
    
   

    

     

    
    

     

          for(i=0;i<8;i++){
     
    
   

    

     

    
    

     

              in = (in << 1);
     
    
   

    

     

    
    

     

              SPI_CLK = 1; 
     
    
   

    

     

    
    

     

              //SPI_DLY_us(1);
     
    
   

    

     

    
    

     

              temp = SPI_MISO;
     
    
   

    

     

    
    

     

              if (temp == 1){
     
    
   

    

     

    
    

     

                  in = in | 0x01;
     
    
   

    

     

    
    

     

              }
     
    
   

    

     

    
    

     

              SPI_CLK = 0;
     
    
   

    

     

    
    

     

              //SPI_DLY_us(1);   
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     

          return in;
     
    
   

    

     

    
    

     

      }
     
    
  
 

4、写字节函数

  

   

    

     

    
    

     

      void SPI_SendByte(uint8 cmd)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

          unsigned char i=8, temp=0;
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

          //SPI_CS=0;
     
    
   

    

     

    
    

     
   
     
    
   

    

     

    
    

     

          for(i=0;i<8;i++){
     
    
   

    

     

    
    

     

              SPI_CLK=0;
     
    
   

    

     

    
    

     
         
     
    
   

    

     

    
    

     

              temp = cmd&0x80;
     
    
   

    

     

    
    

     

              if (temp == 0)
     
    
   

    

     

    
    

     

              {
     
    
   

    

     

    
    

     

                  SPI_MOSI = 0;
     
    
   

    

     

    
    

     

              }
     
    
   

    

     

    
    

     

              else
     
    
   

    

     

    
    

     

              {
     
    
   

    

     

    
    

     

                  SPI_MOSI = 1;
     
    
   

    

     

    
    

     

              }
     
    
   

    

     

    
    

     

              cmd<<=1;;             
     
    
   

    

     

    
    

     

              SPI_CLK=1; 
     
    
   

    

     

    
    

     

              //SPI_DLY_us(1);
     
    
   

    

     

    
    

     

          }
     
    
   

    

     

    
    

     
    
     
    
   

    

     

    
    

     

          SPI_MOSI=1;
     
    
   

    

     

    
    

     

      }
     
    
  
 

5、读数据

  

   

    

     

    
    

     

      unsigned char ReadRawRC(unsigned char Address)
     
    
   

    

     

    
    

     

      {
     
    
   

    

     

    
    

     

        unsigned char ucAddr, ucResult=0;
     
    
   

    

     

    
    

     

        SPI_CS=0;
     
    
   

    

     

    
    

     

        ucAddr = ((Address<<1)&0x7E)|0x80;
     
    
   

    

     

    
    

     

        SPI_SendByte(ucAddr);
     
    
   

    

     

    
    

     

        ucResult = SPI_ReadByte();
     
    
   

    

     

    
    

     

        SPI_CS = 1;
     
    
   

    

     

    
    

     

        return ucResult;
     
    
   

    

     

    
    

     

      }
     
    
  
 

6、写数据

  

   

    

     

    
    

     

      void WriteRawRC(unsigned char Address, unsigned char value)
     
    
   

    

     

    
    

     

      {  
     
    
   

    

     

    
    

     

        unsigned char  ucAddr;
     
    
   

    

     

    
    

     

        SPI_CS=0;
     
    
   

    

     

    
    

     

        ucAddr = ((Address<<1)&0x7E);
     
    
   

    

     

    
    

     

        SPI_SendByte(ucAddr);
     
    
   

    

     

    
    

     

        SPI_SendByte(value);
     
    
   

    

     

    
    

     

        SPI_CS = 1;
     
    
   

    

     

    
    

     

      }
     
    
  
 

文章来源: blog.csdn.net，作者：简一商业，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/liwei16611/article/details/73420685