lpc2132pwm.txt

基于菲利蒲LPC2132PWM功能的实现,

/******************************************************************/
 
PWM控制程序：
#include "config.h"
#include "new_key.h"
#include "lcd.h"
extern signed char num;
extern char keep_code[];
extern char info[];
extern char expect[];
/******************************************/
void PWM_Init()
{
    PINSEL0  = (PINSEL0&0xfffcffff)|(0x02 << 16);  // P0.8选择PWM4功能
    
    /* PWM初始化 */
    PWMPR    = 0x00;      // 不分频，计数频率为Fpclk
    PWMMCR   = 0x02;   // 设置PWMMR0匹配时复位PWMTC
    PWMPCR   = 0x1000;   // 允许PWM2输出，单边PWM
    PWMMR0   = Fpclk / 10000;
    PWMMR4   = PWMMR0 / 2;  // 50%占空比
    PWMLER   = 0x11;   // PWM0和PWM2匹配锁存
    PWMTCR   = 0x02;            // 复位PWMTC
    PWMTCR   = 0x09;            // 启动PWM输出
}
/*********************************/
void PWM_Change(void)
{   
    uint32 tmp=0;
    if(keep_code[num-1]==0x0f)
    {
     info[6]=keep_code[0]+'0';
     info[7]=keep_code[1]+'0';
     info[8]='.';
     info[9]=keep_code[3]+'0';
     tmp=keep_code[0]*10000+keep_code[1]*1000+keep_code[2]*100+keep_code[3]*10;
     PWMMR0=Fpclk/tmp;
     PWMMR4=PWMMR0/2;
    }
    if(keep_code[1]==0x0e)
    {
        expect[0]=keep_code[0];
        expect[2]=keep_code[2];
        expect[3]=keep_code[3];
    }
    
    else
    {
        info[13]=keep_code[0]+'0';
        info[14]=keep_code[1]+'0';
        tmp=keep_code[0]*10+keep_code[1];
     PWMMR4 =  PWMMR0*tmp/100; // 设置输出频率
 }
 PWMLER   = 0x11;      // 更新匹配值后，必须锁存
}
/********************************/
void PWM_Status()
{ char status; 
   status= PWMMR4*10/PWMMR0;
   info[13]=status+'0';
   info[14]=PWMMR4*10%PWMMR0*10/PWMMR0+'0';
   //   info[13]=codes[0]+'0';
   //     info[14]=codes[1]+'0';
   // data_assic[2]=data/343+48;
 // data=data%343*10;
}
/****************************/
void PWM_Up(uint16 up)
{
     PWMMR4=(PWMMR4+(PWMMR0*up)/1000);
  if(PWMMR4>(PWMMR0-5))
  PWMMR4=PWMMR0-5;
 // num=-1;
  PWMLER=0x11;

}
/****************************/
void PWM_Down(uint16 down)
{
    if(PWMMR4!=0)
    {
    PWMMR4=(PWMMR4-(down*PWMMR0)/1000);
    if(PWMMR4<5)
    PWMMR4=0;
    }
    PWMLER= 0x11; 
   // num=-1;
}

#include "config.h"

#include "music.h"
const uint32 HCMM[] = 
{    _LA,_SO,_MI,_LA,_SO,_MI,
    _LA,_LA,_SO,_LA,
    _LA,_SO,_MI,_LA,_SO,_MI,
    _RE,_RE,_DO,_RE,
    _MI,_MI,_SO,_LA,_DO1,_LA,_SO,
    _MI,_MI,_SO,_DO,
    _MI,_MI,_MI,_MI,_MI,
    _1LA,_1LA,_1SO,_1LA
};

const uint32 HCMM_L[] = 
{    _4,_8,_8,_4,_8,_8,
    _8,_4,_8,_2,
    _4,_8,_8,_4,_8,_8,
    _8,_4,_8,_2,
    _4,_8,_8,_8,_8,_8,_8,
    _8,_4,_8,_2,
    _4,_4,_4,_8,_8,
    _8,_4,_8,_2
};

void Delay(uint8 dly)
{
    uint32 i;
    for(;dly>0;dly--)
        for(i=0;i<0x7FFFF;i++);
}

int main(void)
{
    uint8 i;
    PINSEL0 = 0x02<<14;
    PWMPR = 0x00;
    PWMMCR = 0x02;
    PWMPCR = 0x0400;
    PWMMR0 = Fpclk/1000;
    PWMMR2 = PWMMR0/2;
    PWMLER = 0x05;
    PWMTCR = 0x02;
    PWMTCR = 0x09;
    
    while(1)
    {
        for(i=0;i<sizeof(HCMM);i++)
        {
            PWMMR0 = Fpclk/HCMM;
            PWMLER = 0x05;
            Delay(HCMM_L);
        }
    }            
    
    return 0;
}