串口中断接收.txt

f2812 串口中断测试程序

#include"DSP281x_Device.h"
#include"DSP281x_Examples.h"

#define SCI_IO   0x0030

void IO_function(void);
void Scib_init(void);
void Scib_xmit(int a);
interrupt void scibRxFifoIsr(void);
void error(void);

Uint16 ReceivedChar;

void main(void)
{
    InitSysCtrl();        //初始化系统控制寄存器、PLL、看门狗和时钟
    
    IO_function();   
    
    DINT;                 //禁止和清除所有CPU中断向量表
    
    InitPieCtrl();        //初始化PIE控制寄存器
    
    IER=0x0000;
    IFR=0x0000;
    
    InitPieVectTable();   //初始化中断向量表
   
    EALLOW;
	PieVectTable.RXBINT = &scibRxFifoIsr;
	EDIS;  

    PieCtrlRegs.PIECRTL.bit.ENPIE = 1;     // Enable the PIE block
    PieCtrlRegs.PIEIER9.bit.INTx3=1;       // PIE Group 9, INT3
    IER = 0x101;	// Enable CPU INT
    EINT;  
    ERTM;   // 允许DEBUG中段
    
    
    
    Scib_init();

    for(;;)
    {
   /*  while(ScibRegs.SCIFFRX.bit.RXFIFST==0){}
     ReceivedChar=ScibRegs.SCIRXBUF.all;
     ReceivedChar&=0xFF;
     Scib_xmit(ReceivedChar);*/
    }
}

void error(void)
{
    asm("     ESTOP0"); // Test failed!! Stop!
    for (;;);
}	

void IO_function(void)
{
 EALLOW;
 GpioMuxRegs.GPGMUX.all|=SCI_IO;      //SCIB口功能口
 EDIS;
}

void Scib_xmit(int a)
{
  ScibRegs.SCITXBUF=(a&0xff);             //发送数据缓冲寄存器
  while(ScibRegs.SCICTL2.bit.TXRDY!=1){}; //发送缓冲寄存器准备好标志位
}

//#pragma CODE_SECTION(Scib_init, "scib_rx_isrFuncs");
void Scib_init(void)
{
  /*  ScibRegs.SCIFFTX.all=0xE040;         //允许接收,使能FIFO,没有FIFO中断
                                         //清除TXFIFINT,
    ScibRegs.SCIFFRX.all=0x204f;         //使能FIFO接收,清除RXFFINT,16级FIFO
    ScibRegs.SCIFFCT.all=0x0000;         //禁止波特率校验
    ScibRegs.SCICCR.all =0x0007;         //1个停止位,无校验,禁止自测试,
    									 //空闲地址模式,字长8位
	ScibRegs.SCICTL1.all =0x0003;        //复位
	ScibRegs.SCICTL2.all =0x0000;        //
    ScibRegs.SCIHBAUD    =0x0001;        //设定波特率9600bps
    ScibRegs.SCILBAUD    =0x00E7;        //设定波特率9600bps
	ScibRegs.SCICCR.bit.LOOPBKENA =0;    //禁止芯片内部连接
	ScibRegs.SCIPRI.bit.FREE=1;          //自由运行
	ScibRegs.SCICTL1.all =0x0023;      */
	
	ScibRegs.SCIFFTX.all =0xE040;         //允许接收,使能FIFO,没有FIFO中断
                                         //清除TXFIFINT,
    ScibRegs.SCIFFRX.all =0x2021;         //使能FIFO接收,清除RXFFINT,16级FIFO
    ScibRegs.SCIFFCT.all =0x0000;         //禁止波特率校验
    ScibRegs.SCICCR.all  =0x0007;         //1个停止位,无校验,禁止自测试,
    									 //空闲地址模式,字长8位    									 																																										
   	ScibRegs.SCICTL1.all =0x0003;        //复位
	ScibRegs.SCICTL2.all =0x0003;  
    ScibRegs.SCIHBAUD    =0x0001;        //设定波特率9600bps
    ScibRegs.SCILBAUD    =0x00E7;        //设定波特率9600bps
	ScibRegs.SCICTL1.all =0x0023;        //退出RESET
}   

interrupt void scibRxFifoIsr(void)
{   
  ReceivedChar= ScibRegs.SCIRXBUF.all;
  ReceivedChar&=0xFF; 
  Scib_xmit(ReceivedChar);
  ScibRegs.SCIFFRX.bit.RXFFOVRCLR=1;   // Clear Overflow flag
  ScibRegs.SCIFFRX.bit.RXFFINTCLR=1;   // Clear Interrupt flag
  PieCtrlRegs.PIEACK.all|=0x100;       // Issue PIE ack
}