PWMA 波形

DEVI***

大家好，请帮忙看看我的示波器波形，为啥是断续的小脉冲。输出频率应该是1KHZ互补波形。

Debu***

#include "reg51.h"
#include "intrins.h"

typedef struct TIM1_struct
{
    volatile unsigned char CR1;     /*!< control register 1 */
    volatile unsigned char CR2;     /*!< control register 2 */
    volatile unsigned char SMCR;    /*!< Synchro mode control register */
    volatile unsigned char ETR;     /*!< external trigger register */
    volatile unsigned char IER;     /*!< interrupt enable register*/
    volatile unsigned char SR1;     /*!< status register 1 */
    volatile unsigned char SR2;     /*!< status register 2 */
    volatile unsigned char EGR;     /*!< event generation register */
    volatile unsigned char CCMR1;   /*!< CC mode register 1 */
    volatile unsigned char CCMR2;   /*!< CC mode register 2 */
    volatile unsigned char CCMR3;   /*!< CC mode register 3 */
    volatile unsigned char CCMR4;   /*!< CC mode register 4 */
    volatile unsigned char CCER1;   /*!< CC enable register 1 */
    volatile unsigned char CCER2;   /*!< CC enable register 2 */
    volatile unsigned char CNTRH;   /*!< counter high */
    volatile unsigned char CNTRL;   /*!< counter low */
    volatile unsigned char PSCRH;   /*!< prescaler high */
    volatile unsigned char PSCRL;   /*!< prescaler low */
    volatile unsigned char ARRH;    /*!< auto-reload register high */
    volatile unsigned char ARRL;    /*!< auto-reload register low */
    volatile unsigned char RCR;     /*!< Repetition Counter register */
    volatile unsigned char CCR1H;   /*!< capture/compare register 1 high */
    volatile unsigned char CCR1L;   /*!< capture/compare register 1 low */
    volatile unsigned char CCR2H;   /*!< capture/compare register 2 high */
    volatile unsigned char CCR2L;   /*!< capture/compare register 2 low */
    volatile unsigned char CCR3H;   /*!< capture/compare register 3 high */
    volatile unsigned char CCR3L;   /*!< capture/compare register 3 low */
    volatile unsigned char CCR4H;   /*!< capture/compare register 3 high */
    volatile unsigned char CCR4L;   /*!< capture/compare register 3 low */
    volatile unsigned char BKR;     /*!< Break Register */
    volatile unsigned char DTR;     /*!< dead-time register */
    volatile unsigned char OISR;    /*!< Output idle register */
}TIM1_TypeDef;

#define TIM1_BaseAddress    0xFEC0

#define TIM1        ((TIM1_TypeDef xdata*)TIM1_BaseAddress)
#define PWMA_ENO    (*(unsigned char volatile xdata *)0xFEB1)
#define PWMA_PS     (*(unsigned char volatile xdata *)0xFEB2)

sfr     P0M0    =   0x94;
sfr     P0M1    =   0x93;
sfr     P1M0    =   0x92;
sfr     P1M1    =   0x91;
sfr     P3M0    =   0xb2;
sfr     P3M1    =   0xb1;
sfr     P_SW2   =   0xba;

sbit    P03     =   P0^3;

void main(void)
{
    P_SW2 = 0x80;

    P0M1 = 0x00;
    P0M0 = 0xFF;
    P1M1 = 0x00;
    P1M0 = 0xFF;

    PWMA_ENO = 0xFF;                            //IO输出PWM
    PWMA_PS = 0x00;                             //00:PWM at P1

/**********************************************************
PWMx_duty = [CCRx/(ARR + 1)]*100
***********************************************************/
    TIM1-> PSCRH = 0x00;                        //预分频寄存器
    TIM1-> PSCRL = 0x00;
    TIM1-> DTR = 0x00;                          //死区时间配置

    TIM1-> CCMR1 = 0x68;                        //通道模式配置
    TIM1-> CCMR2 = 0x68;
    TIM1-> CCMR3 = 0x68;
    TIM1-> CCMR4 = 0x68;

    TIM1-> ARRH = 0x08;                         //自动重装载寄存器，计数器overflow点
    TIM1-> ARRL = 0x00;

    TIM1-> CCR1H = 0x04;                        //计数器比较值
    TIM1-> CCR1L = 0x00;
    TIM1-> CCR2H = 0x02;
    TIM1-> CCR2L = 0x00;
    TIM1-> CCR3H = 0x01;
    TIM1-> CCR3L = 0x00;
    TIM1-> CCR4H = 0x01;
    TIM1-> CCR4L = 0x00;

    TIM1-> CCER1 = 0x55;                        //配置通道输出使能和极性
    TIM1-> CCER2 = 0x55;                        //配置通道输出使能和极性

    TIM1-> BKR = 0x80;                          //主输出使能 相当于总开关
    TIM1-> IER = 0x02;                          //使能中断
    TIM1-> CR1 = 0x01;                          //使能计数器

    EA = 1;
    while (1);
}

void PWMA_ISR() interrupt 26
{
    if(TIM1->SR1 & 0X02)
    {
        P03 = ~P03;
        TIM1->SR1 &=~0X02;
    }
}

Debu***

DEVI***

原因找到了，不能放WHILE循环里面