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                 281x-SCI和PC间的通讯

// $          Date:   30/11/2009        整理：  eyes417      $
//###########################################################################
//

//   FILE :  281x-SCI_PC.c

//
//  TITLE:  281x-SCI和PC间的通讯  ---  查询方式，使用FIFO   #此前在首页部分显示#            

//               PC发送至串口，DSP再回送至PC                                //

//

//                        ASSUMPTIONS:
//   
//   As supplied, this project is configured for "boot to H0" operation.
//   Other then boot mode pin configuration, no other hardware configuration is required. 

//
//###########################################################################

# include "DSP281x_Device.h"    // DSP281x Headerfile Include File
# include "DSP281x_Examples.h"   // DSP281x Examples Include File

 void scia_echoback_init(void);
 void scia_fifo_init(void);
 void scia_xmit(int a);                    //串口发送--数据
 void scia_msg(char *msg);                 //串口发送--字符串

 Uint16 LoopCount;

 void main(void)
 {

    Uint16 ReceivedChar;
    char *msg;

// Step 1. Initialize System Control:

    InitSysCtrl();

// Step 2. Initalize GPIO:
 // InitGpio();  //配置IO口功能为SCIA和SCIB模式

    EALLOW;
    GpioMuxRegs.GPFMUX.bit.SCITXDA_GPIOF4 = 1;
    GpioMuxRegs.GPFMUX.bit.SCIRXDA_GPIOF5 = 1;
    GpioMuxRegs.GPGMUX.bit.SCITXDB_GPIOG4 = 1;
    GpioMuxRegs.GPGMUX.bit.SCIRXDB_GPIOG5 = 1;
    EDIS;

// Step 3. Clear all interrupts and initialize PIE vector table:

    DINT;                   // Disable CPU interrupts
        
    InitPieCtrl();         //初始化PIE控制寄存器

    IER = 0x0000;               

    IFR = 0x0000;

    InitPieVectTable();    //初始化PIE中断向量表

// Step 4. Initialize all the Device Peripherals:

   // InitPeripherals();    //初始化所有外设

// Step 5. User specific code:

    scia_fifo_init();      

    scia_echoback_init(); 

//从PC上的串口调试助手输入要发送的数据至DSP

    msg = "\r\nYou will enter a character, and the DSP will echo it back! \n\0";
    scia_msg(msg);

    for(;;)
    {
       msg = "\r\nEnter a character: \0";
       scia_msg(msg);

       // 查询方式--接收--使用FIFO
       while(SciaRegs.SCIFFRX.bit.RXFIFST!=1) { }      // wait for XRDY =1 for empty state
                                                       //XRDY =1 (空状态)等待数据发送
       // 接收数据
       ReceivedChar = SciaRegs.SCIRXBUF.all;

       // Echo character back
       msg = "  You sent: \0";
       scia_msg(msg);
       scia_xmit(ReceivedChar);     //串口发送函数

       LoopCount++;

     }  //end for

}  //end main