pwmtest.c

单片机输出PWM波形电机驱动 mc338865

#include<msp430x16x.h>
#include"pwm_timer_b.h"
#include"setclock.h"
#include"7290.h"
#include"lcd.h"
//使用MCLOCK时钟8MHz产生可调频率和站空比的方波，
//频率：8M/f
//占空比：c/f
void pwm();
unsigned char which=0;  //判断模式
unsigned char  go;//判断结束


unsigned int f=20000;
unsigned int c=10000;
char temp1=0;
char temp2=0;
unsigned long display_frq;
unsigned char  ReadBuf[3];
unsigned char display1[]="";
unsigned char display2[]="";
unsigned char display_f[]="";
unsigned char display_scal[]="";
unsigned char display_Hz[]="";
unsigned char display_KHz[]="";


int main() {
    which=1;
    pwm();
    return 1;
    }
    

void pwm(){
  WDTCTL=WDTPW+WDTHOLD;
  open_XT2();            //7290需要MCLK
  BCSCTL2 =SELM_2+SELS;	
  _EINT ( ); 
  ini_7290();
  TimerBInit();
  LCD_LcmInit();
  LCD_LcmClearTXT();
  LCD_PutStr(0,0,display1); 
  LCD_PutStr(1,0,display2);                      
  while(0==GoPwm(100,c,f));
  LCD_PutNum(0,3,8000/f); 
  LCD_PutStr(0,6,display_KHz); 
  LCD_PutNum(0,4,c*100/f); 
  LCD_PutStr(0,6,display_scal); 
  go=1;
  
  while(go)  {
    //LPM3;       //若PWM用ACLK,可进入低功耗
    //LMP0;      //若PWM用SMCLK,可进入低功耗
    if(temp1!=temp2)  {       //只有进入中断函数重新设置c,f后才更新输出，否则由于不断更新会使波形混乱
    
      if(f>100)  {   
         LCD_LcmClearTXT();
         LCD_PutStr(0,0,display1); 
         LCD_PutStr(1,0,display2);
         display_frq=8000000/f;
         LCD_PutNum(0,3,display_frq); 
         LCD_PutStr(0,6,display_Hz); 
         LCD_PutNum(0,4,(unsigned int)c*100/f); 
         LCD_PutStr(0,6,display_scal); 
         }
      else  {
         LCD_LcmClearTXT();
         LCD_PutStr(0,0,display1); 
         LCD_PutStr(1,0,display2);
         display_frq=8000/f;
         LCD_PutNum(0,3,display_frq); 
         LCD_PutStr(0,6,display_KHz); 
         LCD_PutNum(0,4,(unsigned int)c*100/f); 
         LCD_PutStr(0,6,display_scal); 
       }
      
         
      while(0==GoPwm(100,c,f));
      temp1=temp2;
    }
  }
   
  while((0==GoPwm(0,c,f)));  //关闭PWM

    
  }  
  



     
#pragma vector = PORT2_VECTOR
__interrupt void l7289do ()  {

   uchar key_num;
   IRcvStr(0x70,0x01,(uchar*)ReadBuf,3);
   key_num=ReadBuf[0] ;  
   
 if(which==1)  {
   if(ReadBuf[1]==0) {    //禁止连按
      switch (key_num)  {
        case 6: if((f>1)&&(c>1))  {
                           f=f/2; 
                           c=c/2;
                          }
                break;
        case 14: if(f<=0xef)  {
                            f=f*2; 
                            c=c*2;
                            }
                break;
        case 13:  if(c>1)  c=c/2; 
                break;
        case 15:  if(c<f/2) c=c*2;
                break;
        case 7:  go=0; break;
        default :break;
      }    
  temp2=~temp2;
  }
 }  
  P2IFG&=~0X10;                                 
}