为什么龙丘蕊片的串口用不了呢？ - 智能车制作

#include <hidef.h> /* common defines and macros */
#include <MC9S12XS128.h> /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12xs128"
#define LINE_MAX 100
#define ROW_MAX 480
//int start;
int i;
int row;
void SetBusClock(void){
CLKSEL=0X00; // disengage PLL to system
PLLCTL_PLLON=1; // turn on PLL
SYNR=0x1F; // VCOFRQ[7:6];SYNDIV[5:0];fVCO= 2*fOSC*(SYNDIV + 1)/(REFDIV + 1);fPLL= fVCO/(2 × POSTDIV);BUS= fPLL/2
REFDV=0x07; // REFFRQ[7:6];REFDIV[5:0]
_asm(nop); // BUS CLOCK=32M
_asm(nop);
while(!(CRGFLG_LOCK==1)); //when pll is steady ,then use it;
CLKSEL_PLLSEL =1; //engage PLL to system;
}
void InitSci(void)
{
SCI0CR1 =0x00;
SCI0CR2 =0x2c; //enable Receive Full Interrupt,RX enable,Tx enable
SCI0BDH =0x01;
SCI0BDL =0xA0; //SCI0BDL=busclk/(16*SCI0BDL)
//busclk 8MHz, 9600bps,SCI0BD=0x34
//busclk 16MHz, 9600bps,SCI0BD=0x68
//busclk 24MHz, 9600bps,SCI0BD=0x9C
//busclk 32MHz, 9600bps,SCI0BD=0xD0
//busclk 40MHz, 9600bps,SCI0BD=0x106
//busclk 48MHz, 9600bps,SCI0BD=0x138
//busclk 56MHz, 9600bps,SCI0BD=0x16D
//busclk 64MHz, 9600bps,SCI0BD=0x1A0
//busclk 72MHz, 9600bps,SCI0BD=0x1D5
//PORTA=0X00;
}
/**************发射端程序************************/
void SciTx(char text)
{
while (!(SCI0SR1&0x80));
SCI0DRH=0;
SCI0DRL=text;
}
void send() {
for(row=0;row<11000;row++){
for(i=0;i<1000;i++)
SciTx('d');
}
SciTx('\n');
}
void main(void) {
/* put your own code here */
SetBusClock();
InitSci();
EnableInterrupts;
send();
for(;;) {
}
}

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