how to write delay routine using timer in ccs compiler

[Mickytickky]

hi
i m new to tis forum...
can anyone say how to write 10ms delay using timer in ccs compiler...
i m using PIC16F676... i m using tis controller for my project...
it will be very helpful for me.....
Thanks in advance

 

[ckshivaram]

ccs compiler have inbuilt routines for delay.. why not use it....

 

[Mickytickky]

s frd i know that..... but i need to see how it works with timer..........it will be simpler if using built in functions so i m trying with timer...if u know kindly help its very important and mean much for me..................

dont use sms or short hand typing in this forum

 

[ckshivaram]

#include <16F876.h>
#device *=16
#fuses HS, NOWDT, NOLVP, NOPROTECT
#use delay(clock=16000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

#define MY_TIMER_1_RATE 10 // Every 10 ms
#define MY_TIMER_2_RATE 50 // Every 50 ms


int8 sw_timer1;
int8 sw_timer2;

// This timer interrupt is configured to fire every 1 ms
// Inside are two software based timers that fire every x ms.
#int_timer0
void my_timer_isr(void)
{
set_timer0( get_timer0() + (256 - 250)); // Adjust timer0 value to assure it overflows
// every 1000us instead of 1024us

if (--sw_timer1 == 0)
{
sw_timer1 = MY_TIMER_1_RATE;
// Do your timer 1 thing here
}

if (--sw_timer2 == 0)
{
sw_timer2 = MY_TIMER_2_RATE;
// Do your timer 2 thing here
}
}

void main(void)
{
sw_timer1 = MY_TIMER_1_RATE;
sw_timer2 = MY_TIMER_2_RATE;

setup_timer_0(RTCC_INTERNAL | RTCC_DIV_16); // 1 tick every 4 us (at 16MHz)
enable_interrupts(INT_TIMER0);
enable_interrupts(GLOBAL);

while(TRUE);
}

 

[are]

///////////////////////////////////////////////////////////////////////////
//// EX_PULSE.C ////
//// ////
//// This program uses the RTCC (timer0) to time a single pulse ////
//// input to the PIC. ////
//// ////
//// Configure the CCS prototype card as follows: ////
//// Connect pulse generator to pin B1 ////
//// ////
//// Jumpers: ////
//// PCB pin A2 to RS232 RX, pin A3 to RS232 TX ////
//// PCM,PCH pin C7 to RS232 RX, pin C6 to RS232 TX ////
//// ////
//// This example will work with the PCB, PCM, PCH and PCD compilers. ////
//// The following conditional compilation lines are used to ////
//// include a valid device for each compiler. Change the device, ////
//// clock and RS232 pins for your hardware if needed. ////
///////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2003 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS ////
//// C compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, ////
//// reproduction or distribution is permitted without written ////
//// permission. Derivative programs created using this software ////
//// in object code form are not restricted in any way. ////
///////////////////////////////////////////////////////////////////////////


#if defined(__PCB__)
#include <16C56.h>
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_A3, rcv=PIN_A2)

#elif defined(__PCM__)
#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

#elif defined(__PCH__)
#include <18F452.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

#elif defined(__PCD__)
#include <30F2010.h>
#fuses HS, NOWDT, NOPROTECT
#use delay(clock=20000000)
#use rs232(baud=9600, UART1A)
#endif

#include <ctype.h>

char get_scale() {
char scale;

do {
printf("\n\rPress S for short or L for long: ");
scale = getc();
scale = toupper(scale);
} while ( (scale!='S') && (scale!='L') );

return(scale);
}

void wait_for_low_to_high() {

while(input(PIN_B1)) ; /* if it's high, wait for a low */

delay_us(3); /* account for fall time */

while(!input(PIN_B1)); /* wait for signal to go high */
}

void wait_for_low() {

delay_us(3); /* account for rise time */

while(input(PIN_B1)); /* wait for signal to go low */
}


void main() {

char scale;
int16 time;

do {

scale = get_scale();
#if defined(__PCD__)
if(scale == 'S')
{
/* The user specified the smaller timer division */
setup_timer1(TMR_INTERNAL | TMR_DIV_BY_8);
}
else
{
/* The user specified the larger timer division */
setup_timer1(TMR_INTERNAL | TMR_DIV_BY_256);
}
#else
if(scale == 'S')
{
/* The user specified the smaller timer division */
setup_timer_1(TMR_INTERNAL | T1_DIV_BY_1);
}
else
{
/* The user specified the larger timer division */
setup_timer_1(TMR_INTERNAL | T1_DIV_BY_8);
}
#endif

wait_for_low_to_high();
set_timer1(0);
wait_for_low();
time = get_timer1();

printf("Counter value: %2X\n\n\r", time);

} while (TRUE);
}