我把程序稍微改了一下，你试试看（主要是对TDRE的操作）。
interrupt 20 void SCI0_rx(void)
{
if (SCI0SR1 & 0x80)
{ /*If transmission flag is set*/
SCI0SR1;
//if(*(SCIStringp++) != '\0')
if (g_pSci1TxHead != g_pSci1TxBufEnd)
{
//if(*SCIStringp > 0xD)
//{ /*Avoid to change CR and LF characters*/
// SCI0DRL=*SCIStringp + Stringcase;
//}
//else{
g_pSci1TxHead++;
SCI0DRL= *SCIStringp++;;
//}
}
else
{
g_pSci1TxHead = SCIString;
SCIIniTx=START_CYCLE; /*Start new transmission cycle*/
/*SCI0CR2 &= 0x7F; /*Disable TDRE interrupt*/
}
}
if(SCI0SR1 & 0x20){ /*If reception flag is set*/
SCI0SR1;
if(SCI0DRL == 'U' || SCI0DRL == 'u'){
Stringcase = 0x00; /*Uppercase the character string*/
}
else if(SCI0DRL == 'L' || SCI0DRL == 'l'){
Stringcase = 0x20; /*Lowercase the character string*/
}
}
return;
}
#pragma CODE_SEG DEFAULT
//************************************************************************
// SCI²ÎÊýÉèÖÃ
//************************************************************************
void Init_SCI(void)
{
//SCI0ÓëMonitorͨÐÅ
////SCI0BDL=6;
SCI0BDL=13;
SCI0BDH=0; //CLOCK=7.3728MHz, bps=38400
////SCI0CR1=0x16; //9 bit, żЧÑé
SCI0CR1=0x06; //8 bit, żЧÑé
SCI0CR2=0x2C; //ÖÐÖ¹·û²úÉúÆ÷¹Ø±Õ
SCI0CR2 |= 0x80; /*Enable TDRE interrupt*/
}
void SCITx(unsigned char SCIByte){
SCI0DRL = SCIByte; /*Write data byte to SCIDRL register*/
/*SCI0CR2 |= 0x80; /*Enable TDRE interrupt*/
}
void main(void)
{
/*
DDRB = 1;
while (1){
PORTB_BIT0^=1;
}*/
/* put your own code here */
EnableInterrupts;
Init_SCI();
SCIIniTx = START_CYCLE; /*Initialize transmission cycle flag*/
for (;;)
{
if(SCIIniTx == START_CYCLE){
SCIIniTx = WAIT_CYCLE;
SCIStringp=SCIString; /*Set pointer to character string*/
SCITx(*SCIStringp + Stringcase);/*Send first byte of string*/
}
}
}
[此贴子已经被strongchen于2007-3-30 15:34:02编辑过] | 
