to pic mastres

[aamir]

Hello
 
 
I am beginner to Pic Microcontoller .I am using timer1 to count 8 clik pulses using
 
 
interrupts and then toggle RB0 to output Frequency at RB0 should be 32 KiloHz
 
 
 
but it is 14 KiloHz only what is wrong wit code. Pic is 16f877A. frequency at TICK is
 
256KiloHz.
 
 
 
#include "D:\Timer\Timer.h"
#bit TimerOn = 0x10.0
#bit TimerFlag = 0x0C.0
#byte TimerLow = 0x0E
#BYTE TimerHigh = 0x0F
#bit Clk = 0x6.0
unsigned char Flag = 0;
void Check(void);
#use fast_io(B)
#int_TIMER1
TIMER1_isr()
{
Clk = ~Clk;or //output_toggle(Pin_b0);
set_timer1(0xFFFF);
Flag = 1;
}
 
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_EXTERNAL|T1_DIV_BY_1);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(VREF_LOW|-2);
enable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL);
TimerOn = 0;
SET_TRIS_B(0xF0 );
SET_TRIS_D(0xFF );
TimerFlag = 0;
Clk = 1;
 
set_timer1(0xFFFF);
//TimerHigh = 0xFF;
//TimerLow = 0xFF;
 
Check();
Flag = 0;
TimerOn = 1;
//while(Clk);
do
{
do
{
}while(!Flag);
 
Flag = 0;
 
}while(1);
}
void Check(void)
{
int i;
for(i = 1 ;i<10;i++)
{
output_toggle(PIN_B1);
delay_ms(100);
}
}

[telfo2007]

it could be a problem with your clock configuration. For example I used to begin with CCS compiler like this...


#include <18F4620.h>  <-- procesor type
//#device *=16

#device adc=8

#FUSES NOWDT                    //No Watch Dog Timer
//#FUSES HS                       //High speed Osc (> 4mhz)
#fuses INTRC_IO
//#FUSES PLL                       //High speed Osc * 4 (> 4mhz)
#FUSES NOFCMEN                  //Fail-safe clock monitor disabled
#FUSES NOBROWNOUT               //No brownout reset
#FUSES NOPUT                    //No Power Up Timer
#FUSES NODEBUG                  //No Debug mode for ICD
#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOWRT                    //Program memory not write protected
#FUSES MCLR                     //Master Clear pin enabled
#FUSES NOPROTECT                //Code not protected from reading
#FUSES NOXINST

#use delay(clock=32000000)

I hope it helps you.
Bye

[drovik]

May be PWM solve you problem

[vibrex2007]

What version of CCS do you have?

[BLK]

the clock is 256 divide with 32 = 8, divide with 2 is 4
                    setup_timer_1(T1_EXTERNAL|T1_DIV_BY_4);
for intrerupt use fast code :
            #int_global
             isr()
or #int_xxx FAST


#include <16F877A.h>
#use delay (clock=20000000)
#bit TimerOn = 0x10.0
#bit TimerFlag = 0x0C.0
#byte TimerLow = 0x0E
#BYTE TimerHigh = 0x0F
#bit Clk = 0x6.0
unsigned char Flag = 0;
void Check(void);
#use fast_io(B)

#int_global
isr()
{
   TimerFlag = 1;
   Clk = ~Clk; //output_toggle(Pin_b0);
   Flag = 0;
   set_timer1(0xFFFF);   
   TimerFlag = 0;
}
 
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_EXTERNAL|T1_DIV_BY_4);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(VREF_LOW|-2);
enable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL);
TimerOn = 0;
SET_TRIS_B(0xF0 );
SET_TRIS_D(0xFF );
TimerFlag = 0;
Clk = 1;
 
set_timer1(0xFFFF);

// Check();
Flag = 0;
TimerOn = 1;
do{
   do{ }while(!Flag);
 
   Flag = 0;
  }while(1);
}

void Check(void)
{
   int i;   
   for(i = 1 ;i<10;i++)
      {
         output_toggle(PIN_B1);
         delay_ms(1);
      }
}