xsadc主程序代码.txt

适用软件：Code Warrior 4.7 Target : MC9S12XS128单片机 Crystal: 16.000Mhz busclock: 8.000MHz pllclock:16.

#include <hidef.h>      /* common defines and macros */
#include <MC9S12XS128.h>     /* derivative information */
#include <stdio.h> 

#pragma LINK_INFO DERIVATIVE "mc9s12xs128"

#pragma CODE_SEG DEFAULT  
//-----------------------------------------------------
void setbusclock(void)
{   
    CLKSEL=0X00;				//disengage PLL to system
    PLLCTL_PLLON=1;			//turn on PLL
    SYNR=1;										
    REFDV=1;		        //pllclock=2*osc*(1+SYNR)/(1+REFDV)=32MHz;
    _asm(nop);          //BUS CLOCK=16M
    _asm(nop);
    while(!(CRGFLG_LOCK==1));	  //when pll is steady ,then use it;
    CLKSEL_PLLSEL =1;		        //engage PLL to system; 
}
//-----------------------------------------------------
static void SCI_Init(void) 
{
    SCI0CR2=0x2c; //enable Receive Full Interrupt,RX enable,Tx enable
    SCI0BDH=0x00; //busclk  8MHz,19200bps,SCI0BDL=0x1a
    SCI0BDL=0x68; //SCI0BDL=busclk/(16*SCI0BDL)                   
                  //busclk 16MHz, 9600bps,SCI0BDL=0x68                   
}            
void uart_putchar(unsigned char ch)
{ 
  if (ch == '\n')  
  {
      while(!(SCI0SR1&0x80)) ;     
      SCI0DRL= 0x0d;       				 //output'CR'
	    return;
  }
  while(!(SCI0SR1&0x80)) ; 		    //keep waiting when not empty  
  SCI0DRL=ch;
}

void putstr(char ch[])
{
  unsigned char ptr=0;
  while(ch[ptr]){
      uart_putchar((unsigned char)ch[ptr++]);
  } 
}
unsigned char uart_getkey(void)
{  
   byte res=0;
   while(!(SCI0SR1&0x80)) ; 		 //keep waiting when not empty  
   return (SCI0DRL);
}
//-----------------------------------------------------  
void AD_Init(void) 
{  
  
  ATD0CTL1=0x00;   //7:1-外部触发,65:00-8位精度,4:放电,3210:ch
  ATD0CTL2=0x40;   //禁止外部触发, 中断禁止    
  ATD0CTL3=0xa0;   //右对齐无符号,每次转换4个序列, No FIFO, Freeze模式下继续转    
  ATD0CTL4=0x01;   //765:采样时间为4个AD时钟周期,ATDClock=[BusClock*0.5]/[PRS+1]
  ATD0CTL5=0x30;   //6:0特殊通道禁止,5:1连续转换 ,4:1多通道轮流采样
  ATD0DIEN=0x00;   //禁止数字输入 
} 
//-----------------------------------------------------  
void Dly_ms(int ms)
{
   int ii,jj;
   if (ms<1) ms=1;
   for(ii=0;ii<ms;ii++)
     for(jj=0;jj<2670;jj++);    //busclk:16MHz--1ms
} 
byte ReadATD(byte ch)
{
  byte ad=0;  
  while(!ATD0STAT0_SCF);
  switch(ch)
  {
    default:
    case 0:
      ad= ATD0DR0L;
    break;
    case 1:
      ad= ATD0DR1L;
    break;
    case 2:
      ad= ATD0DR2L;
    break;
    case 3:
      ad= ATD0DR3L;
    break;
    case 4:
      ad= ATD0DR4L;
    break;
    case 5:
      ad= ATD0DR5L;
    break;
    case 6:
      ad= ATD0DR6L;
    break;
    case 7:
      ad= ATD0DR7L;
    break;   
  }
  return ad;
}

#pragma CODE_SEG __NEAR_SEG NON_BANKED 
void interrupt 20  SCI0_ISR(void)
{     
  SCI0CR2_RIE=0;
  //此处为串口中断需要处理的事情
  uart_putchar(uart_getkey());
  PORTA_PA0=~PORTA_PA0;
  SCI0CR2_RIE = 1;    
}

void main(void){
  char  txtbuf[16]="";
  unsigned char LedCnt=0;
  int fenwei=0,gewei=0;  
  
  setbusclock();  
  SCI_Init();
  AD_Init();
  DDRA=0xFF;
  DDRB=0xFF;
  PUCR_PUPAE=1;
  putstr("\nLongQiu s.&t. Co. Ltd.");    
  putstr("\nhttp://shop36265907.taobao.com");       
  EnableInterrupts;  

  for(;;) 
  {   
    LedCnt=(LedCnt>0XFE?0:++LedCnt);
    Dly_ms(1000);   //修改延时以修改数据发送频率
    
    //低电平灯亮用这句,注释掉下面那句 
    PORTA_PA0=~PORTA_PA0;
    PORTB=~LedCnt;  
    
    //高电平灯亮用这句,注释掉上面那句   
    //PORTB=LedCnt;
    fenwei=ReadATD(0) *100/51;//参考电压5V, 500/255    
    gewei=fenwei/100;
    fenwei=fenwei%100;    
    sprintf(txtbuf,"\nAD0:%d.%02dV,",gewei,fenwei);
    
    putstr(txtbuf);
    fenwei=ReadATD(1) *100/51;//参考电压5V, 500/255    
    gewei=fenwei/100;
    fenwei=fenwei%100;    
    sprintf(txtbuf,"\nAD1:%d.%02dV,",gewei,fenwei);
    putstr(txtbuf);
    
    fenwei=ReadATD(2) *100/51;//参考电压5V, 500/255    
    gewei=fenwei/100;
    fenwei=fenwei%100;    
    sprintf(txtbuf,"\nAD2:%d.%02dV,",gewei,fenwei);
    putstr(txtbuf);
    
    fenwei=ReadATD(3) *100/51;//参考电压5V, 500/255    
    gewei=fenwei/100;
    fenwei=fenwei%100;    
    sprintf(txtbuf,"\nAD3:%d.%02dV;",gewei,fenwei);
    putstr(txtbuf);
  }
}