timer.c

WAV 数字输出播放器

//Timer.c
#include <p33FJ64GP306.h>
#include "integer.h"

//there are button timer routine here
#include "button.h"

//implements timer initialize and interrupt

//Flag in main.c
extern BYTE Timer_Flag;


void Timer_Init(void)
{
	//Timer 1: main timer. about 0.226ms
	//Disable Timer
	T1CONbits.TON = 0;
	//Select Clock = Prescaled Fcy
	T1CONbits.TGATE = 0;
	T1CONbits.TCS = 0;
	//Initialize Timer Value
	TMR1 = 0x0000;
	//Prescaler for Fcy = 1/64
	T1CONbits.TCKPS = 0b10;
	//Comparator Value
	PR1 = 100;
	//Fcy 28,224,000Hz / 64 / 100 = 4410Hz
	//T1IF Gate = Comparator
	T1CONbits.TGATE = 0;
	//Set Timer 1 interrupt Priority
	IPC0bits.T1IP = 0x04;
	//Clear Timer 1 Int Flag
	IFS0bits.T1IF = 0;
	//Enable Timer 1 interrupt
	IEC0bits.T1IE = 1;

	
	//Timer 2: Key Button Timer. 10ms.
	//Disable Timer
	T2CONbits.TON = 0;
	//16bit mode
	T2CONbits.T32 = 0;
	//Select Clock = Prescaled Fcy
	T2CONbits.TGATE = 0;
	T2CONbits.TCS = 0;
	//Initialize Timer Value
	TMR2 = 0x0000;
	//Prescaler for Fcy = 1/256
	T2CONbits.TCKPS = 0b11;
	//Comparator Value
	PR2 = 1000;
	//Fcy 28,224,000Hz / 256 / 1000 = 110.25 Hz Timer
	//T2IF Gate = Comparator
	T2CONbits.TGATE = 0;
	//Set Timer 2 interrupt Priority
	IPC1bits.T2IP = 0x06;
	//Clear Timer 2 Int Flag
	IFS0bits.T2IF = 0;
	//Enable Timer 2 interrupt
	IEC0bits.T2IE = 1;
	
	//Clear External Timer Flag
	Timer_Flag = 0;
	
	//This is Test Pin, for Timer 1
	PORTFbits.RF3 = 0;
	TRISFbits.TRISF3 = 0;
	
	//Enable Timer
	T1CONbits.TON = 1;
	T2CONbits.TON = 1;
	
}	

void __attribute__((interrupt, no_auto_psv)) _T1Interrupt(void)
{
	//Set Timer Flag
	Timer_Flag = 1;
	
	//This is Test Pin, for Timer
	PORTFbits.RF3 = 1;

	//Clear Timer 1 interrupt Flag
	IFS0bits.T1IF = 0;
}

void __attribute__((interrupt, no_auto_psv)) _T2Interrupt(void)
{
	//Call Button Check routine;
	Read_Buttons();
	
	//Clear Timer 2 interrupt Flag
	IFS0bits.T2IF = 0;
}