贴上程序：
void main(void)
{
Uint16 ReceivedChar;
char *msg;
InitSysCtrl();
InitScibGpio();
// InitXintf16Gpio();
DINT;
InitPieCtrl();
// Disable CPU interrupts and clear all CPU interrupt flags:
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
// Step 5. User specific code:
LoopCount = 0;
ErrorCount = 0;
scib_fifo_init(); // Initialize the SCI FIFO
scib_echoback_init(); // Initalize SCI for echoback
msg = "\r\n\n\nHello World!\0";
scib_msg(msg);
msg = "\r\nYou will enter a character, and the DSP will echo it back! \n\0";
scib_msg(msg);
for(;;)
{
msg = "\r\nEnter a character: \0";
scib_msg(msg);
// Wait for inc character
while(ScibRegs.SCIFFRX.bit.RXFFST == 0) {} // ==1 break->receive BUF has new DATA
msg = " You sent: \0";
scib_msg(msg);
// Get all character
do
{
ReceivedChar = ScibRegs.SCIRXBUF.all;
// Echo character back
scib_xmit(ReceivedChar);
}while(ScibRegs.SCIFFRX.bit.RXFFST != 0);
LoopCount++;
}
}
// Test 1,SCIA DLB, 8-bit word, baud rate 0x000F, default, 1 STOP bit, no parity
void scib_echoback_init()
{
// Note: Clocks were turned on to the SCIA peripheral
// in the InitSysCtrl() function
ScibRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback
// No parity,8 char bits,
// async mode, idle-line protocol
ScibRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,
// Disable RX ERR, SLEEP, TXWAKE
ScibRegs.SCICTL2.all =0x0003;
ScibRegs.SCICTL2.bit.TXINTENA = 1;
ScibRegs.SCICTL2.bit.RXBKINTENA =1;
#if (CPU_FRQ_150MHZ)
ScibRegs.SCIHBAUD =0x0001; // 9600 baud @LSPCLK = 37.5MHz.
ScibRegs.SCILBAUD =0x00E7;
#endif
#if (CPU_FRQ_100MHZ)
ScibRegs.SCIHBAUD =0x0001; // 9600 baud @LSPCLK = 20MHz.
ScibRegs.SCILBAUD =0x0044;
#endif
ScibRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
}
// Transmit a character from the SCI
void scib_xmit(int a)
{
while (ScibRegs.SCIFFTX.bit.TXFFST != 0) {}
ScibRegs.SCITXBUF=a;
}
void scib_msg(char * msg)
{
int i;
i = 0;
while(msg[i] != '\0')
{
scib_xmit(msg[i]);
i++;
}
}
// Initalize the SCI FIFO
void scib_fifo_init()
{
//ScibRegs.SCIFFTX.all=0x8000;
ScibRegs.SCIFFTX.all=0xE040;
ScibRegs.SCIFFRX.all=0x204f;
ScibRegs.SCIFFCT.all=0x0; //禁止串口自动检测波特率
}
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