N79E815A的pwm设置问题

只看该作者 · 2018-11-7 15:50

#define PWMP          0x0DD
#define PWM0_Duty    0x06F
#define PWM1_Duty    0x06F
#define PWM2_Duty    0x06F
#define PWM3_Duty    0x06F
#define P00_Quasi_Mode P0M1&=~SET_BIT0;P0M2&=~SET_BIT0  //将P0.0口设置为准双向模式，作为输入
#define P30_Quasi_Mode P3M1&=~SET_BIT0;P3M2&=~SET_BIT0  //将P3.0口设置为准双向模式，作为输入
#define P01_PushPull_Mode    P0M1&=~SET_BIT1;P0M2|=SET_BIT1//将P0.1口设置为准双向模式，作为输出

typedef enum
{
E_CHANNEL0,
E_CHANNEL1,
E_CHANNEL2,
E_CHANNEL3,
} E_PWMCNL_SEL;

#include <stdio.h>
#include "N79E81x.h"
#include "Typedef.h"
#include "Define.h"
#include "Common.h"
#include <intrins.h>
#include "Version.h"
#include "Delay.h"
#include <string.h>

sbit key=P0^0;
bit flag=0;
UINT16 PWM_shadow;

void Init_PWM(void)
{
//AUXR1 |= Uart_Port_Sel;          // Select P10/P11 as UART pin(default)
//InitialUART0_Timer1(9600);       // 9600 Baud Rate @ 11.0592MHz
//printf ("\n*===================================================================");
//printf ("\n*  Name: N79E81x Series PWM Sample Code.");
//printf ("\n*===================================================================");
//printf ("\nPWM Demo Start.\n");

PWM_shadow = PWMP;
PWMPH = HIBYTE(PWM_shadow);       // PWM Period，根据PWMP可求出周期，分别放在计数寄存器高八位和低八位
PWMPL = LOBYTE(PWM_shadow);
PWMCON0 = 0xD0;                   // Enable PWM and select auto reload mode  使能且计数器溢出后，PWMP自动加载
}
void PWM_Pin_Recover_IO(void)  //复位函数
{
PWMCON0 = 0x00;//
PWMCON1 = 0x00;//
PWMCON2 = 0x00;//
PWMPH = 0x00;//
PWMPL = 0x00;//
PWM0H = 0x00;//
PWM0L = 0x01;//
PWM1H = 0x00;//
PWM1L = 0x01;//
PWM2H = 0x00;//
PWM2L = 0x01;//
PWM3H = 0x00;//
PWM3L = 0x01; // PWMP < PWMn Duty, PWM Pin Output High(no-active)
PWMCON0 = 0xD0;// PWM Run  运行PWM
_nop_ ();    // NOP
PWMCON0 = 0x2F;// PWM Stop
}
void PWM_Channel(E_PWMCNL_SEL Channel)//选择PWM通道
{
switch(Channel)
{
      case E_CHANNEL0:
         PWM_shadow=PWM0_Duty;
         PWM0H = HIBYTE(PWM_shadow);// PWM0 Duty (P0.1)
         PWM0L = LOBYTE(PWM_shadow);
         break;
      case E_CHANNEL1:
         PWM_shadow=PWM1_Duty;
         PWM1H = HIBYTE(PWM_shadow);// PWM1 Duty (P1.6)
         PWM1L = LOBYTE(PWM_shadow);
         break;
      case E_CHANNEL2:
         PWM_shadow=PWM2_Duty;
         PWM2H = HIBYTE(PWM_shadow);// PWM2 Duty (P1.7)
         PWM2L = LOBYTE(PWM_shadow);
         break;
      case E_CHANNEL3:
         PWM_shadow=PWM3_Duty;
         PWM3H = HIBYTE(PWM_shadow);// PWM3 Duty (P0.0)
         PWM3L = LOBYTE(PWM_shadow);
         break;
}

}
void Enabled_Brake_Function(void)    //钳位函数
{
PWMCON1 = 0x30;    // PWM is running. PWM will be stopped when P0.2 is low level.
}       //打开钳位，当声明为钳位引脚，没有pwm输出，PWMRUN将被清零（0：pwm没有运行）且BKF标志置位。PWM输出条件依据PWMNB设置
//-----------------------------------------------------------------------------------------------------------

//按键启停子函数
void Scan(void)
{
if(key==0)
   {
   Delay1ms(300);
   if(key==0)
   {
   flag=~flag;
   }
   while(key==0);//检测松手

}
}
//程序运行子函数
void Disp(void)
  {
if(flag==1)
{
P30=0;
PWM_Channel(E_CHANNEL0);       // Select PWM channel.
      Init_PWM();                   // Enable PWM function and set PWM period.
      Enabled_Brake_Function();       // Enable Brake function.
}
else if(flag==0)
{
P30=1;
P01=0;
}
  }

void main(void)
{
      P00_Input_Mode;
      P30_Quasi_Mode;
      P01_PushPull_Mode;
      flag=0;


   while(1)
{
         Scan();//循环检测是否有按键按下启停子程序
      Disp();
}

}

只看该作者 · 2018-11-7 16:27

我现在把else if 里面的P01=0去掉后，虽然是有pwm输出，占空比也对，正向峰值将近5v，但pwm的最低值不是0v.是1v.所以不知道为什么

只看该作者 · 2018-11-7 23:17

你用官方原版的例子跑一个，看看是多少，先确定是软件问题还是硬件。

只看该作者 · 2018-11-8 15:53

没看懂你用P3.0还是内置RC