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lokeshbhatt
Joined: 16 Mar 2010
Posts: 11
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| PIC16f690 Timer1 not working properly |
 Posted: Wed Apr 21, 2010 11:51 pm |
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Hi,
What is the maximum clock can I get using internal oscillator? What is
that noclear in ISR? Is this Timer code right?
| Code: |
#include <16f690.h>
//#inlcude "stdio.h"
//#fuses NOWDT,NOPROTECT,CPD,NOMCLR,NOIESO,NOFCMEN // preprocessor directive that defines fuses for the chip
#fuses INTRC_IO,NOWDT,NOPROTECT,CPD,NOMCLR,NOIESO,NOFCMEN
#use delay(clock=8000000)
#priority timer1//#use rs232(baud=9600, xmit=PIN_B7, rcv=PIN_B5) // preprocessor directive that includes the rs232 libraries
#define Square_Pulse PIN_B4
#define LED_Blink PIN_B5
#define test PIN_B6
unsigned char fStartOfPolling;
/*****************************************************
************** TIMER ISR FUNCTION *****************
******************************************************/
#INT_TIMER1 noclear
void my_timer()
{
static int tCountFor20msec,tCountFor1sec,fFor12Sec,CountForLEDBlink;
// disable_interrupts(GLOBAL);
// clear_interrupt(INT_TIMER1);
//SET_TIMER1(25536);
// OUTPUT_TOGGLE(test);
if( tCountFor20msec++ == 50 )
{
// output_toggle( Square_Pulse);
if( CountForLEDBlink == 0)
output_toggle(LED_Blink);
else if (CountForLEDBlink == 5)
OUTPUT_LOW(LED_Blink);
if( tCountFor1sec++ == 12)
{
output_toggle( Square_Pulse);
fStartOfPolling = 1;
tCountFor1sec = 0;
CountForLEDBlink = 5;
}
tCountFor20msec=0;
}
// puts("micro");
//enable_interrupts(GLOBAL);
}
void main()
{
int InputPortValue = 0;
SET_TRIS_C(0b00000000); // 3 OUTPUT
SET_TRIS_A(0b11111111); // 4 INPUT
SET_TRIS_B(0b00000000); // FOR SQUARE WAVE, LED BLINK
//setup_oscillator(OSC_INTRC);
setup_adc_ports(NO_ANALOGS | VSS_VDD);
setup_adc(ADC_OFF);
setup_comparator(NC_NC_NC_NC);
//setup_adc_ports(sAN8 | VSS_VDD);
// for 20msec 40000 count required
//disable_interrupts(INT_TIMER1);
//SET_TIMER1(0);
//clear_interrupt(INT_TIMER1);
SET_TIMER1(25536);
SETUP_TIMER_1(T1_INTERNAL | T1_DIV_BY_1 );
enable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL);
/************ LOW-HIGH-LOW PULSE ON PWRKEY PIN OF GSM */
OUTPUT_C(0x00);
OUTPUT_LOW(Square_Pulse);
OUTPUT_HIGH(LED_Blink);
OUTPUT_HIGH(test);
while(1)
{
if( fStartOfPolling == 1)
{
InputPortValue = INPUT_A();
InputPortValue = (InputPortValue & 0x0F );
if(InputPortValue == 0x08 ) // INPUT 1 IS HIGH
OUTPUT_C(0x04);
else if(InputPortValue == 0x0C )
OUTPUT_C(0x02);
else if(InputPortValue == 0x0E )
OUTPUT_C(0x06);
else if(InputPortValue == 0x0F )
OUTPUT_C(0x01);
}
}
}
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Thanx in anticipation
Lokesh
_________________
Thanks & Regards
Lokesh Bhatt |
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dyeatman
Joined: 06 Sep 2003
Posts: 1933
Location: Norman, OK
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| Posted: Thu Apr 22, 2010 5:39 am |
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Answers to your questions:
1. See the data sheet page 48 for the max oscillator speed.
2. See page 116 of the current manual for the meaning of noclear
3. no
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Ttelmah
Joined: 11 Mar 2010
Posts: 19504
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| Posted: Thu Apr 22, 2010 9:33 am |
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And, because noclear is used, the code as posted cannot work. It'll hang forever in the timer1 interrupt...
Best Wishes |
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