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Trying to generat 2 PWM in port C using PIC18F2431

 
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sonicdeejay



Joined: 20 Dec 2005
Posts: 112

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Trying to generat 2 PWM in port C using PIC18F2431
PostPosted: Thu Jan 12, 2006 6:28 am     Reply with quote

My code is as followed....

and I can't measure any square wave in my oscilloscope,,,



#include <18F2331.h>
#device adc=8 //Where x is the number of bits read_adc() should return
#use delay(clock = 4000000)
//#use delay(clock=20000000)
#fuses XT,NOWDT,WDT128,HS, NOPROTECT, IESO, BROWNOUT, BORV27, NOPUT, NOCPD, STVREN, NODEBUG, LVP, NOWRT, NOWRTD, FCMEN, NOWINEN, T1LOWPOWER, HPOL_HIGH, NOWRTC, NOWRTB, NOEBTR, NOEBTRB, NOCPB, LPOL_HIGH, PWMPIN, NOMCLR, FLTAC1, SSP_RC


void main()
{

//setup_adc_ports(NO_ANALOGS|VSS_VDD);

setup_adc(ADC_OFF|ADC_TAD_MUL_0);

setup_spi(FALSE);

setup_wdt(WDT_ON);

setup_timer_0(RTCC_INTERNAL);

setup_timer_1(T1_DISABLED);

setup_timer_2(T2_DISABLED,0,1);

SET_TRIS_A( 0x0F ); //Declare as Output

//setup_adc_ports( RA0_ANALOG );
//setup_adc( ADC_CLOCK_INTERNAL );
//set_adc_channel( 0 );

//int i, value, min, max;
while(1)
{

output_high(PIN_A0);
delay_ms(1000);
output_low(PIN_A0);
delay_ms(1000);
output_high(PIN_A0);
delay_ms(500);
output_low(PIN_A0);
delay_ms(500);


//PWM test Drive
output_low(PIN_C1); // Set CCP2 output low
output_low(PIN_C2); // Set CCP1 output low

setup_ccp1(CCP_PWM); // Configure CCP1 as a PWM
setup_ccp2(CCP_PWM); // Configure CCP2 as a PWM

setup_timer_2(T2_DIV_BY_16, 124, 1); // 500 Hz
set_pwm1_duty(31); // 25% duty cycle on pin C2
set_pwm2_duty(62); // 50% duty cycle on pin C1



}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Jan 12, 2006 1:37 pm     Reply with quote

Make the changes shown in bold below:

Quote:
#fuses XT,NOWDT,WDT128,HS, NOPROTECT, IESO, BROWNOUT, BORV27, NOPUT, NOCPD, STVREN, NODEBUG, NOLVP, NOWRT, NOWRTD, FCMEN, NOWINEN, T1LOWPOWER, HPOL_HIGH, NOWRTC, NOWRTB, NOEBTR, NOEBTRB, NOCPB, LPOL_HIGH, PWMPIN, NOMCLR, FLTAC1, SSP_RC


Quote:
void main()
{

//setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_OFF|ADC_TAD_MUL_0);
setup_spi(FALSE);
setup_wdt(WDT_ON);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
SET_TRIS_A( 0x0F ); //Declare as Output

//setup_adc_ports( RA0_ANALOG );
//setup_adc( ADC_CLOCK_INTERNAL );
//set_adc_channel( 0 );
//int i, value, min, max;

// while(1) // Comment out these two lines.
//{

output_high(PIN_A0);
delay_ms(1000);
output_low(PIN_A0);
delay_ms(1000);
output_high(PIN_A0);
delay_ms(500);
output_low(PIN_A0);
delay_ms(500);

//PWM test Drive
output_low(PIN_C1); // Set CCP2 output low
output_low(PIN_C2); // Set CCP1 output low

setup_ccp1(CCP_PWM); // Configure CCP1 as a PWM
setup_ccp2(CCP_PWM); // Configure CCP2 as a PWM

setup_timer_2(T2_DIV_BY_16, 124, 1); // 500 Hz
set_pwm1_duty(31); // 25% duty cycle on pin C2
set_pwm2_duty(62); // 50% duty cycle on pin C1


while(1); // Add this line
}
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