我可能只是用这些寄存器之一看不到森林，但我无法让 PWM 在dsPIC33FJ32MC102微控制器上工作（警告：大 PDF）我'米玩弄。我已经遵循了数据表和进一步的应用说明（警告：另一个 PDF）甚至代码示例，但我看不出我做错了什么，尽管在我的测试台上我得到了高输出的 Vcc 和接地低输出。我已将故障引脚都绑定到 Vcc 并禁用了注册键码，因此我的更改应该会看到一些效果。我究竟做错了什么？
#define FOSC (3686400ULL)
#define FCY (FOSC/2)
#include <xc.h>
#include <libpic30.h>
...
#pragma config PWMPIN = ON // Motor Control PWM Module Pin Mode bit (PWM module pins controlled by PORT register at device Reset)
#pragma config PWMLOCK = OFF
...
void main(void){
...
//setup PWM
//Clear faults
IFS3bits.PWM1IF = 0;
IFS3bits.FLTA1IF = 0;
IFS4bits.FLTB1IF = 0;
//Setup dead times
P1DTCON1bits.DTAPS = 0b00; //Dead time tick is 1 TCY
P1DTCON1bits.DTBPS = 0b00;
P1DTCON1bits.DTA = 10; //Dead time is 10TCY ~= 3uS
P1DTCON1bits.DTB = 10;
P1DTCON2bits.DTS1A = 0; //Active and Inactive transition dead times
P1DTCON2bits.DTS2A = 0; //0 takes A dead time
P1DTCON2bits.DTS3A = 0; //1 takes B dead time
P1DTCON2bits.DTS1I = 1;
P1DTCON2bits.DTS2I = 1;
P1DTCON2bits.DTS3I = 1;
P1TCONbits.PTOPS = 0b0000; //1 CPU tick = 1 PWM tick
P1TCONbits.PTCKPS = 0b00;
P1TCONbits.PTMOD = 0b00;
P1TCONbits.PTSIDL = 0; //Run when CPU idles
// no longer necessary since I disabled register write lock:
// __builtin_write_PWMSFR(&P1FLTACON,0x0000,&PWM1KEY);
// __builtin_write_PWMSFR(&P1FLTBCON,0x0000,&PWM1KEY);
// __builtin_write_PWMSFR(&PWM1CON1 ,0x0077,&PWM1KEY);
PWM1CON1 = 0x0077; //Enable all 3 channels
P1FLTACON = 0x0000; //Disable faults
P1FLTBCON = 0x0000;
//Setup Wave freq/duty
//Fosc = 7.3728 MHz -> Fcy = 3.6864MHz
//Desire a PWM of 20250Hz (smaller scalar error than 20kHz)
//P1TPER = [Fcy/(Fpwm*Scalar)] - 1
//Therefore P1TPER = [3.6864M/(20250*1)] - 1 = 181;
P1TPER = 181;
P1DC1 = 0x7FFF; // 0x7FFF for 50%
P1DC2 = 0x7FFF;
P1DC3 = 0x7FFF;
P1OVDCON = 0x3F00; //Disable override; override disables PWM
PWM1CON2 = 0x0000;
P1TCONbits.PTEN = 1; //Turn on
...
while(1);
}