MC9S12XS128 ADC 例程

chiusir · 发表于 2009-2-17 17:16:34

/**************************************************************************************
龙丘MC9S12XS128 多功能开发板
Designed by Chiu Sir
E-mail:chiusir@163.com
软件版本:V1.1
最后更新:2009年2月16日
相关信息参考下列地址：
博客：  http://longqiu.21ic.org
淘宝店：http://shop36265907.taobao.com
------------------------------------
Code Warrior 4.7
Target : MC9S12XS128
Crystal: 16.000Mhz
busclock: 8.000MHz
pllclock:16.000MHz
本程序主要包括以下功能：
1.设置锁相环和总线频率；
2.IO口使用；
3.共四路ATD使用及显示方法。
LED计数，根据灯亮可以读取系统循环了多少次
*****************************************************************************************/
#include <hidef.h>    /* common defines and macros */
#include <MC9S12XS128.h>    /* derivative information */
#include "LQprintp.h"
#pragma LINK_INFO DERIVATIVE "mc9s12xs128"

#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;
}
#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; //出口波特率为9600
SCI0BD =0x68; //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
//-----------------------------------------------------
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;
}
void main(void){
  unsigned char LedCnt=0;
  int fenwei=0,gewei=0;

  setbusclock();
  SCI_Init();
  AD_Init();
  DDRA=0xFF;
  PUCR_PUPAE=1;
  putstr("\nLongQiu s.&t.\n");
  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;

//高电平灯亮用这句,注释掉上面那句
//PORTB=LedCnt;

putstr("\nWeb: shop36265907.taobao.com");

fenwei=ReadATD(0) *100/51;//参考电压5V, 500/255
gewei=fenwei/100;
fenwei=fenwei%100;
printp("\nAD0:%d.%02dV,",gewei,fenwei);

fenwei=ReadATD(1) *100/51;//参考电压5V, 500/255
gewei=fenwei/100;
fenwei=fenwei%100;
printp("\nAD1:%d.%02dV,",gewei,fenwei);

fenwei=ReadATD(2) *100/51;//参考电压5V, 500/255
gewei=fenwei/100;
fenwei=fenwei%100;
printp("\nAD2:%d.%02dV,",gewei,fenwei);

fenwei=ReadATD(3) *100/51;//参考电压5V, 500/255
gewei=fenwei/100;
fenwei=fenwei%100;
printp("\nAD3:%d.%02dV;",gewei,fenwei);
  }
}