timer.c

ST7540 Demo 下位机C程序

//*********************************************************************************
//*               ST 7538 DEMOBOARD SOFTWARE 	  timer.c                           *
//*                                                                               *
//*               timer functions                      V1.2                       *
//*********************************************************************************

#include "global.h"

// OCMP1: Timer 1ms



#pragma DATA_SEG APP_RAM


typedef struct {
	unsigned short stop;		 //absolute stop time (when timer expired)
	unsigned short period;	 //timer period
}timeout_s;

volatile timeout_s      Timeout[TIMEOUT_NUM];
volatile unsigned short tim_ms;

unsigned char TSR_L;
unsigned short int TCR;

/**********************************************************************************
* TIMER_Interrupt function updates the 1ms timer and the RS232 timer
**********************************************************************************/
#pragma TRAP_PROC SAVE_REGS
void TIMER_Interrupt(void)
{

	TSR_L = TSR;
	
	if(TSR_L&OCF2) {					
	TCR = CRH;
	TCR = CRL;      //clear Overflow bit
	TCR = OCLR2;		//clear Output Compare bit
	}
	if(TSR_L&OCF1) {						// 1ms Timer interrupt
		TCR = CRH;
		TCR = (TCR<<8);
		TCR = TCR + CRL;
		TCR = TCR + TIMER_STEP;
		OCHR1 =  (unsigned char) (TCR>>8);
		OCLR1 =  (unsigned char) TCR;
		tim_ms = tim_ms + 1;
//		Button = ADC_ReadButton();			// Buttons Reading
	}
	
 // return;
}

/**********************************************************************************
* TIMER_Init initializates the HW timer and enable the interrupt
**********************************************************************************/
void TIMER_Init(void)
{
	unsigned short int TCR;

	TCR1 = 0x00;
	TCR2 = 0x08;							// ftimer = fclock/8

	TCR = CRH;
	TCR = (TCR<<8) + CRL;
	TCR = TCR + (unsigned short)TIMER_STEP;
	OCHR1 = (unsigned char) (TCR>>8);
	OCLR1 = (unsigned char)  TCR;

	TCR1 |= 0x40; 							// Enables OCIE

}

/**********************************************************************************
*TIMEOUT_Init initializes (close) all the SW timeouts (which depend on 1ms timer)
**********************************************************************************/
void TIMEOUT_Init()
{
	char i;
  for(i=0;i<TIMEOUT_NUM;i++) {
		Timeout[i].period = 0;
	}
	tim_ms = 0;
}

/**********************************************************************************
*TIMEOUT_Open opens a timeout with a user selected period (in ms) and returns the tout number
**********************************************************************************/
unsigned char  TIMEOUT_Open(unsigned short period)
{
	unsigned char i;

	for(i=0;i<TIMEOUT_NUM;i++) {
		if(Timeout[i].period==0) {
			Timeout[i].period = period;
			Timeout[i].stop = (unsigned short)(tim_ms + Timeout[i].period);
			return (i+1);
		}
	}
	return 0;
}

/**********************************************************************************
*TIMEOUT_Close closes a timeout 
**********************************************************************************/
void  TIMEOUT_Close(unsigned char timer)
{

	if((timer>0)&&(timer<=TIMEOUT_NUM))
		Timeout[timer-1].period = 0;

}

/**********************************************************************************
*TIMEOUT_Expired checks if the timeout is expired. return "1" if timeout if tout is expired,
*"0" otherwise
**********************************************************************************/
unsigned char  TIMEOUT_Expired(unsigned char timer)
{
  
	return  ( ((short int) tim_ms - (short int) Timeout[timer-1].stop >= 0) && ( tim_ms - Timeout[timer-1].stop <= 32767));  

}

/**********************************************************************************
*TIMEOUT_Refresh restart the timer updating the stop time
**********************************************************************************/
void __stack_call TIMEOUT_Refresh(unsigned char timer)
{
 DI;
	if((timer>0)&&(timer<=TIMEOUT_NUM)) {
		Timeout[timer-1].stop = (unsigned short) (tim_ms + Timeout[timer-1].period);
	}
EI;
}