美好的一天，我正在使用 PIC24FJ64GA002 微控制器，并且正在努力让 PWM 为我想要使用的伺服系统工作。我的代码如下：
// PIC24FJ64GA002 Configuration Bit Settings
// 'C' source line config statements
// CONFIG2
#pragma config POSCMOD = NONE // Primary Oscillator Select (Primary oscillator disabled)
#pragma config I2C1SEL = PRI // I2C1 Pin Location Select (Use default SCL1/SDA1 pins)
#pragma config IOL1WAY = ON // IOLOCK Protection (Once IOLOCK is set, cannot be changed)
#pragma config OSCIOFNC = OFF // Primary Oscillator Output Function (OSC2/CLKO/RC15 functions as CLKO (FOSC/2))
#pragma config FCKSM = CSDCMD // Clock Switching and Monitor (Clock switching and Fail-Safe Clock Monitor are disabled)
#pragma config FNOSC = FRC // Oscillator Select (Fast RC Oscillator (FRC))
#pragma config SOSCSEL = SOSC // Sec Oscillator Select (Default Secondary Oscillator (SOSC))
#pragma config WUTSEL = LEG // Wake-up timer Select (Legacy Wake-up Timer)
#pragma config IESO = ON // Internal External Switch Over Mode (IESO mode (Two-Speed Start-up) enabled)
// CONFIG1
#pragma config WDTPS = PS32768 // Watchdog Timer Postscaler (1:32,768)
#pragma config FWPSA = PR128 // WDT Prescaler (Prescaler ratio of 1:128)
#pragma config WINDIS = ON // Watchdog Timer Window (Standard Watchdog Timer enabled,(Windowed-mode is disabled))
#pragma config FWDTEN = ON // Watchdog Timer Enable (Watchdog Timer is enabled)
#pragma config ICS = PGx1 // Comm Channel Select (Emulator EMUC1/EMUD1 pins are shared with PGC1/PGD1)
#pragma config GWRP = OFF // General Code Segment Write Protect (Writes to program memory are allowed)
#pragma config GCP = OFF // General Code Segment Code Protect (Code protection is disabled)
#pragma config JTAGEN = OFF // JTAG Port Enable (JTAG port is disabled)
// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.
/*
* File: 34660046LAB2.c
* Author: leone
*
* Created on 06 September 2021, 1:27 PM
*/
#include "p24FJ64GA002.h"
#include "xc.h"
#define _LATR15 OC1R
int main(void) {
T2CON = 0x8010;
TMR2=0;
PR2=9999;
_T2IP=4; //Default priority value
_T2IF=0; //Clears interrupt flag before interrupt
_T2IE=1; //Enables interrupt
OC1CONbits.OC = 0; // Output compare channel is disabled
OC1R = 0x1388 ; // Initialize Compare Register1 with 50% duty cycle
OC1CONbits.OCSIDL = 0; // Output capture will continue to operate in CPU Idle mode
OC1CONbits.OCFLT = 0; // No PWM Fault condition has occurred (this bit is only used when OCM<2:0> = 111)
OC1CONbits.OCTSEL = 0; // Timer2 is the clock source for output Compare
OC1CONbits.OCM = 0x6; // PWM mode on OC, Fault pin disabled
TRISBbits.TRISB15=0;
_LATB15=0;
while(1)
{
if(TMR2>OC1R)
{
_LATB15=1;
}
else
{
_LATB15=0;
}
}
return 0;
}
我将 T1CON 的周期设置为 2 ms，而 OC1R 的周期为该周期的一半，这将导致占空比为 50%。我正在使用 FRC 振荡器 (8MHz)，我的预分频器值为 <0,1>。我知道是 OC1R 引脚给出了周期为高的周期，但在数据表中，他们将其称为引脚，但是他们没有给出它是什么引脚（即 A0、A1、R15 等）。我也可以找到很少的示例代码来解释如何很好地编码。如果有人是某种帮助的PIC专家，将不胜感激！MCU 的数据表可在https://www.microchip.com/en-us/product/PIC24FJ64GA002下载。
