Question

我开发了一个简单的程序来在dsPIC33EV256GM002上产生PWM波形，但我无法禁用它。我使用PWM1和PWM2，我会在PWM1L1引脚（DIP封装上的引脚26）上产生PWM波形，将PWM1H1（DIP封装上的引脚25）保持为数字I / O. 完全是PWM寄存器设置： IOCON1bits.PENL = 1; / * PWM1L由PWM模块 /控制 IOCON1bits.PENH = 0; / PWM1H由GPIO模块控制* / 应该这样做，但是，使用和示波器，我注意到PWM1H1引脚上的PWM波形，具有相反的值（当PWM1L为1时PWM1H为0且veceversa），即使它应该是数字I / O.

您是否发现任何类似的问题？

非常感谢您的帮助与合作

问候

我使用了以下代码：

TRISBbits.TRISB10 = 0;                  /* Set as a digital output */
TRISBbits.TRISB11 = 0;                  /* Set as a digital output */
TRISBbits.TRISB12 = 0;                  /* Set as a digital output */
TRISBbits.TRISB13 = 0;                  /* Set as a digital output */
TRISBbits.TRISB14 = 0;                  /* Set as a digital output */
TRISBbits.TRISB15 = 0;                  /* Set as a digital output */

LATBbits.LATB10 = 0;                /* Set as a digital output */
LATBbits.LATB11 = 0;                /* Set as a digital output */
LATBbits.LATB12 = 0;                /* Set as a digital output */
LATBbits.LATB13 = 0;                /* Set as a digital output */
LATBbits.LATB14 = 0;                /* Set as a digital output */
LATBbits.LATB15 = 0;                /* Set as a digital output */

  PORTBbits.RB10=0;
  PORTBbits.RB11=0;
  PORTBbits.RB12=0;
  PORTBbits.RB13=0;
  PORTBbits.RB14=0;
  PORTBbits.RB15=0;

  PTPER = 4000; 
/*~~~~~~~~~~ PWM1 Configuration ~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/    
IOCON1bits.PENL      = 1;   /* PWM1L is controlled by PWM module */ 
IOCON1bits.PENH      = 0;   /* PWM1H is controlled by GPIO module */
IOCON1bits.PMOD      = 0;   /* Select Independent Output PWM mode */
PDC1 = 500;                 /* Initial Duty cycle */ 
DTR1    = 0;                /* Deadtime setting */
ALTDTR1 = 0;                /* Deadtime setting */
PHASE1 = 0;                 /* No phase shift */

/*~~~~~~~~~~~ PWM2 Configuration ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
IOCON2bits.PENH      = 1;  /* PWM2H is controlled by PWM module */
IOCON2bits.PENL      = 0;  /* PWM2L is controlled by GPIO module */
IOCON2bits.PMOD      = 0;  /* Select Independent Output PWM mode */
PDC2 = 2000;               /* Initial Duty cycle */ 
DTR2    = 0;               /* Deadtime setting */
ALTDTR2 = 0;               /* Deadtime setting */
PHASE2 = 0;                /* */

PTCONbits.PTEN       = 1; /* Enable the PWM Module */

Answer 1

我遇到了与dspic33ev32GP002相同的问题并更改了配置位，如下所示：

// FDEVOPT
#pragma config PWMLOCK = OFF

这对我有用。

Answer 2

问题与IOCONxbits寄存器的写保护有关。我添加了以下行：

_FDEVOPT( PWMLOCK_OFF );

这解决了这个问题。

dsPIC33EV256GM002 PWM设置

2 个答案: