main.c

基于freescale的16位单片机,MC9S12DG128B关于串口的程序

#include <hidef.h>      /* common defines and macros */
#include <mc9s12dg128.h>     /* derivative information */
#pragma LINK_INFO DERIVATIVE "mc9s12dg128b"

/***********全局变量***********************/
unsigned char Data_chg[4];
unsigned char Number ;
/*-------锁相环初始化程序----------------------*/
void PLL_init(void) {
  REFDV = 1;
  SYNR = 2;
  while( !(CRGFLG&0x08) );
  CLKSEL = 0x80; 
}

/*-------串口初始化程序----------------------*/
void SCI_init(void) {
  SCI0CR2 = 0x0c;
  SCI0CR1=0;					/*normal,no parity*/
  SCI0BDL = 0x9c;
}

/*-------发射端程序----------------------*/
void SCI_Tx(unsigned char text) {
  unsigned char temp;
  temp=SCI0SR1;      /*clear flag*/
  while (!(SCI0SR1&0x80));  /* wait for output buffer empty */
  SCI0DRH=0;
  SCI0DRL=text;
}

/*-------接受端程序----------------------*/
char SCI_Rx(void){
  char result,temp;
  temp=SCI0SR1;      /*clear flag*/
  while(!(SCI0SR1&0x20));
  result=SCI0DRL;
  return result;
 }
 /*-------数据处理-----------------------*/
void Data_Prc(unsigned char data){ 
  unsigned char Temp_Prc;
  unsigned char  j;
  
  Temp_Prc = data;
  Number = 1;
 
  while(Temp_Prc){
    Temp_Prc = Temp_Prc/10;
    Number++;
  } 	 
  for( j = 0; j < Number; j++ ) {
    
    if( --Number == j ){
      Data_chg[j] = data % 10 +48;
    } 
    else{
      Data_chg[j] = data / 10 + 48;
    } 
  }		
  Data_chg[Number] = 44;	 
 }
						
 /*-------主函数--------------------------*/
void main(void) {
  /* put your own code here */
  unsigned char data;
  unsigned char temp,Temp_Tx;
  unsigned char i;
  unsigned char out[10] = {10, 20, 30, 40, 50, 60, 70, 80, 90, 100};
  EnableInterrupts;
  PLL_init();
  SCI_init(); 
  for(i = 0; i < 4; i++){
    Data_chg[i] = 0;
  } 
  
  for( i = 0; i < 10; i++){
    temp =  out[i];
    Data_Prc(temp); 
    for( i = 0; i <Number; i++) {
      Temp_Tx =  Data_chg[i];
      SCI_Tx(Temp_Tx);
    } 
  } 
  data = SCI_Rx();
  DDRB = 0XFF;
  PORTB = data; 

  for(;;) {} /* wait forever */
  /* please make sure that you never leave this function */
}