pwm.c

实现了dsPIC30f6012a通过SPC3与PLC通信

//************************************************************************
//File Name:   PWM.c
//Include:     Tremble_Frequency  -- PWM Wave Genreration Fucn
//Description: 
//************************************************************************
#include "Headfiles.h"

//************************************************************************
//Func. Name:        PWM wave generation Func.
//Input variables:   frequency -- PWM tremble frequency(Hz)
//Output variables:  None
//Use sub-func.list: None
//Used by list:      MainFunc.c - main
//Description:       Input frequency and drive Timer-B for PWM wave, ...
//    100~200Hz for proportional valve. >300Hz for sevo valve.
//                  ---------------------
//                 | MSP430              |
//                 |  F167      P4.1/TB1 |37pin--> PWM for valve 1
//                 |            P4.2/TB2 |38pin--> PWM for valve 2
//************************************************************************
void Tremble_Frequency(unsigned int frequency)
{
    unsigned int digital_frequency;
    
    digital_frequency = 8000000 / frequency;
        
    OC2R = digital_frequency;
    PR2 = digital_frequency;
}