单片机软件模拟SPI读写W25Q16

【实例简介】

采用STC89LE516RD软件模拟SPI时序，读写W25Q16 FLASH，有PC串口控制指令，读取数据串口输出显示。
【实例截图】

【核心代码】

void main(void)
{   
 uint i;
    W25X_HOLD=1;              //SPI flash复位
    init_uart();              //串口通信初始化
    SPI_init();               //SPI通信初始化

    tx_buff[0]='O';           //赋值buff第一个字符
    tx_buff[1]='K';           //赋值buff第一个字符
    trace(tx_buff,2);         //描述字符
    for(;;)
    {if(rx_ok==1)             //串口接收标志位
        {
   rx_ok=0;
            switch(Rxtemp)    //串口指令解析
            {
    case 0x01:
                    Rxtemp=0;
                    tx_buff[0]=SPI_Read_ID1();    //读SPI器件ID
                    trace(tx_buff,1);             //串口发送读取到的数据信息
                    break;
                case 0x02:
                    i=SPI_Read_ID2(0x00);
                    tx_buff[1]=(uchar)i;
                    tx_buff[0]=(uchar)(i>>8);
                    trace(tx_buff,2);
                    break;
                case 0x03:
                    i=SPI_Read_ID3();           
                    tx_buff[1]=(uchar)i;
                    tx_buff[0]=(uchar)(i>>8);
                    trace(tx_buff,3);
                    break;
                case 0x04:
                    tx_buff[0]=SPI_Read_Byte(0x00000000);     //读SPI 一字节数据
                    trace(tx_buff,1);
                    break;
                case 0x05:
                    tx_buff[0]=0x55;
                    SPI_Write_Byte(0x00000000,0xa5);          //写SPI 一字节数据 
                    trace(tx_buff,1);
                    break;
                case 0x06:
                    tx_buff[0]=SPI_Read_StatusReg();          //读SPI 状态寄存器       
                    trace(tx_buff,1);
                    break;
                case 0x07:
                    SPI_Write_Enable();                       //开SPI写使能
                    break;
                case 0x08:
                    upper_128[0]=0x01;upper_128[1]=0x02;upper_128[2]=0x03;upper_128[3]=0x04;    //多字节（max=128）数据写入
                    SPI_Write_nBytes(0x00000000,4);
                    break;
                case 0x09:
                    SPI_Erase_Chip();                //全部擦除
                    break;
                case 0x0a:
                    SPI_Erase_Sector(0x000ff000);    //扇区擦除=64k
                    while(1)
                    {   
      tx_buff[0]=SPI_Read_StatusReg();  //擦除进行中状态print
                        if(tx_buff[0]==0)
                        {   
       trace(tx_buff,1);
                            break;
                        }
                    }
                    break;
                case 0x0b:
                    test_page(0x2000);
                    break;
                case 0x0c:
                    read_page(0x20);
                    break;
                default:
                    break;
            }           
        }           
    }
}