#include "reg51.h"
#define CYCLE 0x1000L //定义PWM周期
#define PWMC (*(unsigned int volatile xdata *)0xfff0)
#define PWMCH (*(unsigned char volatile xdata *)0xfff0)
#define PWMCL (*(unsigned char volatile xdata *)0xfff1)
#define PWMCKS (*(unsigned char volatile xdata *)0xfff2)
#define PWM2T1 (*(unsigned int volatile xdata *)0xff00)
#define PWM2T1H (*(unsigned char volatile xdata *)0xff00)
#define PWM2T1L (*(unsigned char volatile xdata *)0xff01)
#define PWM2T2 (*(unsigned int volatile xdata *)0xff02)
#define PWM2T2H (*(unsigned char volatile xdata *)0xff02)
#define PWM2T2L (*(unsigned char volatile xdata *)0xff03)
#define PWM2CR (*(unsigned char volatile xdata *)0xff04)
#define PWM3T1 (*(unsigned int volatile xdata *)0xff10)
#define PWM3T1H (*(unsigned char volatile xdata *)0xff10)
#define PWM3T1L (*(unsigned char volatile xdata *)0xff11)
#define PWM3T2 (*(unsigned int volatile xdata *)0xff12)
#define PWM3T2H (*(unsigned char volatile xdata *)0xff12)
#define PWM3T2L (*(unsigned char volatile xdata *)0xff13)
#define PWM3CR (*(unsigned char volatile xdata *)0xff14)
#define PWM4T1 (*(unsigned int volatile xdata *)0xff20)
#define PWM4T1H (*(unsigned char volatile xdata *)0xff20)
#define PWM4T1L (*(unsigned char volatile xdata *)0xff21)
#define PWM4T2 (*(unsigned int volatile xdata *)0xff22)
#define PWM4T2H (*(unsigned char volatile xdata *)0xff22)
#define PWM4T2L (*(unsigned char volatile xdata *)0xff23)
#define PWM4CR (*(unsigned char volatile xdata *)0xff24)
#define PWM5T1 (*(unsigned int volatile xdata *)0xff30)
#define PWM5T1H (*(unsigned char volatile xdata *)0xff30)
#define PWM5T1L (*(unsigned char volatile xdata *)0xff31)
#define PWM5T2 (*(unsigned int volatile xdata *)0xff32)
#define PWM5T2H (*(unsigned char volatile xdata *)0xff32)
#define PWM5T2L (*(unsigned char volatile xdata *)0xff33)
#define PWM5CR (*(unsigned char volatile xdata *)0xff34)
#define PWM6T1 (*(unsigned int volatile xdata *)0xff40)
#define PWM6T1H (*(unsigned char volatile xdata *)0xff40)
#define PWM6T1L (*(unsigned char volatile xdata *)0xff41)
#define PWM6T2 (*(unsigned int volatile xdata *)0xff42)
#define PWM6T2H (*(unsigned char volatile xdata *)0xff42)
#define PWM6T2L (*(unsigned char volatile xdata *)0xff43)
#define PWM6CR (*(unsigned char volatile xdata *)0xff44)
#define PWM7T1 (*(unsigned int volatile xdata *)0xff50)
#define PWM7T1H (*(unsigned char volatile xdata *)0xff50)
#define PWM7T1L (*(unsigned char volatile xdata *)0xff51)
#define PWM7T2 (*(unsigned int volatile xdata *)0xff52)
#define PWM7T2H (*(unsigned char volatile xdata *)0xff52)
#define PWM7T2L (*(unsigned char volatile xdata *)0xff53)
#define PWM7CR (*(unsigned char volatile xdata *)0xff54)
sfr PIN_SW2 = 0xba;
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
sfr P1M1 = 0x91;
sfr P1M0 = 0x92;
sfr P2M1 = 0x95;
sfr P2M0 = 0x96;
sfr P3M1 = 0xb1;
sfr P3M0 = 0xb2;
sfr P4M1 = 0xb3;
sfr P4M0 = 0xb4;
sfr P5M1 = 0xC9;
sfr P5M0 = 0xCA;
sfr P6M1 = 0xCB;
sfr P6M0 = 0xCC;
sfr P7M1 = 0xE1;
sfr P7M0 = 0xE2;
sfr PWMCFG = 0xf1;
sfr PWMCR = 0xf5;
sfr PWMIF = 0xf6;
sfr PWMFDCR = 0xf7;
void pwm_isr() interrupt 22 using 1
{
static bit dir = 1;
static int val = 0;
if (PWMIF & 0x40)
{
PWMIF &= ~0x40;
if (dir)
{
val++;
if (val >= CYCLE) dir = 0;
}
else
{
val--;
if (val <= 1) dir = 1;
}
PIN_SW2 |= 0x80;
PWM2T2 = val;
PIN_SW2 &= ~0x80;
}
}
void main()
{
P0M0 = 0x00;
P0M1 = 0x00;
P1M0 = 0x00;
P1M1 = 0x00;
P2M0 = 0x00;
P2M1 = 0x00;
P3M0 = 0x00;
P3M1 = 0x00;
P4M0 = 0x00;
P4M1 = 0x00;
P5M0 = 0x00;
P5M1 = 0x00;
P6M0 = 0x00;
P6M1 = 0x00;
P7M0 = 0x00;
P7M1 = 0x00;
PIN_SW2 |= 0x80; //使能访问XSFR
PWMCFG = 0x00; //配置PWM的输出初始电平为低电平
PWMCKS = 0x00; //选择PWM的时钟为Fosc/1
PWMC = CYCLE; //设置PWM周期
PWM2T1 = 0x0000; //设置PWM2第1次反转的PWM计数
PWM2T2 = 0x0001; //设置PWM2第2次反转的PWM计数
//占空比为(PWM2T2-PWM2T1)/PWMC
PWM2CR = 0x00; //选择PWM2输出到P3.7,不使能PWM2中断
PWMCR = 0x01; //使能PWM信号输出
PWMCR |= 0x40; //使能PWM归零中断
PWMCR |= 0x80; //使能PWM模块
PIN_SW2 &= ~0x80;
EA = 1;
while (1);
} |
