I need help

[Jean Paul]

Hi

someone can tell me the possible errors in my code.
my code is for pwm with pin b0 and pin b1 I change the duty cyle
of the pwm. the problem is that I cand view the changes in my scope. I dont know the reason.

thanks

my code is:


#include <16F877.h>
#use delay(clock=1843200)
#fuses XT,NOWDT,NOPROTECT

main() {
long value;
byte data;
SET_TRIS_B( 0xFF );

setup_timer_2(T2_DIV_BY_16,239,1);
setup_ccp1(CCP_PWM);
value=480;
set_pwm1_duty(value); // This sets the time the pulse is


while( TRUE ) {

data = input_b();
data = data && 0x03;
if ( data==0x01)
{
value=value+192;

}

if ( data==0x02)
{
value=value-192;

}



delay_ms(100);
set_pwm1_duty(value);

delay_ms(50);
}

}
___________________________
This message was ported from CCS's old forum
Original Post ID: 8902

[nilsener]

Dear,

I get this code running, perhaps it is a problem that your duty_cycle value (480) is greater than 239 (239 sets the time of one period) as in you setup_timer2 statement. I think you will only get PWM if the duty cycle is between 0 and 239.

regards nilsener

void PWM_INIT()
{
SETUP_CCP1(CCP_PWM); // Set PWM Mode
setup_timer_2(T2_DIV_BY_16, 26, 1); // Set Timer2
SET_PWM1_DUTY(13); // Set Duty to 50\%

} /*End if PWM_INIT*/

:=Hi
:=
:=someone can tell me the possible errors in my code.
:=my code is for pwm with pin b0 and pin b1 I change the duty cyle
:=of the pwm. the problem is that I cand view the changes in my scope. I dont know the reason.
:=
:=thanks
:=
:=my code is:
:=
:=
:=#include <16F877.h>
:=#use delay(clock=1843200)
:=#fuses XT,NOWDT,NOPROTECT
:=
:=main() {
:= long value;
:= byte data;
:= SET_TRIS_B( 0xFF );
:=
:= setup_timer_2(T2_DIV_BY_16,239,1);
:= setup_ccp1(CCP_PWM);
:= value=480;
:= set_pwm1_duty(value); // This sets the time the pulse is
:=
:=
:=while( TRUE ) {
:=
:= data = input_b();
:= data = data && 0x03;
:= if ( data==0x01)
:= {
:= value=value+192;
:=
:= }
:=
:= if ( data==0x02)
:= {
:= value=value-192;
:=
:= }
:=
:=
:=
:= delay_ms(100);
:= set_pwm1_duty(value);
:=
:= delay_ms(50);
:=}
:=
:=}
___________________________
This message was ported from CCS's old forum
Original Post ID: 8909

[Jean Paul]

thanks for your reply

but I thinks my problem is how to detect the bits b0 and b1 of the portB

I use data = (input_b()&& 0x03); to check the status of the
bits 0 an 1 but IT DOESNT WORK
can you tell me another way

thanks


:=Dear,
:=
:=I get this code running, perhaps it is a problem that your duty_cycle value (480) is greater than 239 (239 sets the time of one period) as in you setup_timer2 statement. I think you will only get PWM if the duty cycle is between 0 and 239.
:=
:=regards nilsener
:=
:=void PWM_INIT()
:={
:=SETUP_CCP1(CCP_PWM); // Set PWM Mode
:=setup_timer_2(T2_DIV_BY_16, 26, 1); // Set Timer2
:=SET_PWM1_DUTY(13); // Set Duty to 50\%
:=
:=} /*End if PWM_INIT*/
:=
:=:=Hi
:=:=
:=:=someone can tell me the possible errors in my code.
:=:=my code is for pwm with pin b0 and pin b1 I change the duty cyle
:=:=of the pwm. the problem is that I cand view the changes in my scope. I dont know the reason.
:=:=
:=:=thanks
:=:=
:=:=my code is:
:=:=
:=:=
:=:=#include <16F877.h>
:=:=#use delay(clock=1843200)
:=:=#fuses XT,NOWDT,NOPROTECT
:=:=
:=:=main() {
:=:= long value;
:=:= byte data;
:=:= SET_TRIS_B( 0xFF );
:=:=
:=:= setup_timer_2(T2_DIV_BY_16,239,1);
:=:= setup_ccp1(CCP_PWM);
:=:= value=480;
:=:= set_pwm1_duty(value); // This sets the time the pulse is
:=:=
:=:=
:=:=while( TRUE ) {
:=:=
:=:= data = input_b();
:=:= data = data && 0x03;
:=:= if ( data==0x01)
:=:= {
:=:= value=value+192;
:=:=
:=:= }
:=:=
:=:= if ( data==0x02)
:=:= {
:=:= value=value-192;
:=:=
:=:= }
:=:=
:=:=
:=:=
:=:= delay_ms(100);
:=:= set_pwm1_duty(value);
:=:=
:=:= delay_ms(50);
:=:=}
:=:=
:=:=}
___________________________
This message was ported from CCS's old forum
Original Post ID: 8910

[Tomi]

"&&" is logical AND. Use "&" to get bit-wise AND:
data = input_b() & 0x03;

:=thanks for your reply
:=
:=but I thinks my problem is how to detect the bits b0 and b1 of the portB
:=
:=I use data = (input_b()&& 0x03); to check the status of the
:=bits 0 an 1 but IT DOESNT WORK
:=can you tell me another way
:=
:=thanks
:=
:=
:=:=Dear,
:=:=
:=:=I get this code running, perhaps it is a problem that your duty_cycle value (480) is greater than 239 (239 sets the time of one period) as in you setup_timer2 statement. I think you will only get PWM if the duty cycle is between 0 and 239.
:=:=
:=:=regards nilsener
:=:=
:=:=void PWM_INIT()
:=:={
:=:=SETUP_CCP1(CCP_PWM); // Set PWM Mode
:=:=setup_timer_2(T2_DIV_BY_16, 26, 1); // Set Timer2
:=:=SET_PWM1_DUTY(13); // Set Duty to 50\%
:=:=
:=:=} /*End if PWM_INIT*/
:=:=
:=:=:=Hi
:=:=:=
:=:=:=someone can tell me the possible errors in my code.
:=:=:=my code is for pwm with pin b0 and pin b1 I change the duty cyle
:=:=:=of the pwm. the problem is that I cand view the changes in my scope. I dont know the reason.
:=:=:=
:=:=:=thanks
:=:=:=
:=:=:=my code is:
:=:=:=
:=:=:=
:=:=:=#include <16F877.h>
:=:=:=#use delay(clock=1843200)
:=:=:=#fuses XT,NOWDT,NOPROTECT
:=:=:=
:=:=:=main() {
:=:=:= long value;
:=:=:= byte data;
:=:=:= SET_TRIS_B( 0xFF );
:=:=:=
:=:=:= setup_timer_2(T2_DIV_BY_16,239,1);
:=:=:= setup_ccp1(CCP_PWM);
:=:=:= value=480;
:=:=:= set_pwm1_duty(value); // This sets the time the pulse is
:=:=:=
:=:=:=
:=:=:=while( TRUE ) {
:=:=:=
:=:=:= data = input_b();
:=:=:= data = data && 0x03;
:=:=:= if ( data==0x01)
:=:=:= {
:=:=:= value=value+192;
:=:=:=
:=:=:= }
:=:=:=
:=:=:= if ( data==0x02)
:=:=:= {
:=:=:= value=value-192;
:=:=:=
:=:=:= }
:=:=:=
:=:=:=
:=:=:=
:=:=:= delay_ms(100);
:=:=:= set_pwm1_duty(value);
:=:=:=
:=:=:= delay_ms(50);
:=:=:=}
:=:=:=
:=:=:=}
___________________________
This message was ported from CCS's old forum
Original Post ID: 8913

[R.J.Hamlett]

:=thanks for your reply
:=
:=but I thinks my problem is how to detect the bits b0 and b1 of the portB
:=
:=I use data = (input_b()&& 0x03); to check the status of the
:=bits 0 an 1 but IT DOESNT WORK
:=can you tell me another way
:=
:=thanks
Yes. Use &, not &&. The former is the 'bitwise' AND operator (will do an 'AND' with your '3', and the input byte). The latter is the _logical_ AND operator. The operator you are using will return 'true', if input_b is logically 'true' (non zero), AND the test pattern is tre (which it is).

Best Wishes

:=
:=:=Dear,
:=:=
:=:=I get this code running, perhaps it is a problem that your duty_cycle value (480) is greater than 239 (239 sets the time of one period) as in you setup_timer2 statement. I think you will only get PWM if the duty cycle is between 0 and 239.
:=:=
:=:=regards nilsener
:=:=
:=:=void PWM_INIT()
:=:={
:=:=SETUP_CCP1(CCP_PWM); // Set PWM Mode
:=:=setup_timer_2(T2_DIV_BY_16, 26, 1); // Set Timer2
:=:=SET_PWM1_DUTY(13); // Set Duty to 50\%
:=:=
:=:=} /*End if PWM_INIT*/
:=:=
:=:=:=Hi
:=:=:=
:=:=:=someone can tell me the possible errors in my code.
:=:=:=my code is for pwm with pin b0 and pin b1 I change the duty cyle
:=:=:=of the pwm. the problem is that I cand view the changes in my scope. I dont know the reason.
:=:=:=
:=:=:=thanks
:=:=:=
:=:=:=my code is:
:=:=:=
:=:=:=
:=:=:=#include <16F877.h>
:=:=:=#use delay(clock=1843200)
:=:=:=#fuses XT,NOWDT,NOPROTECT
:=:=:=
:=:=:=main() {
:=:=:= long value;
:=:=:= byte data;
:=:=:= SET_TRIS_B( 0xFF );
:=:=:=
:=:=:= setup_timer_2(T2_DIV_BY_16,239,1);
:=:=:= setup_ccp1(CCP_PWM);
:=:=:= value=480;
:=:=:= set_pwm1_duty(value); // This sets the time the pulse is
:=:=:=
:=:=:=
:=:=:=while( TRUE ) {
:=:=:=
:=:=:= data = input_b();
:=:=:= data = data && 0x03;
:=:=:= if ( data==0x01)
:=:=:= {
:=:=:= value=value+192;
:=:=:=
:=:=:= }
:=:=:=
:=:=:= if ( data==0x02)
:=:=:= {
:=:=:= value=value-192;
:=:=:=
:=:=:= }
:=:=:=
:=:=:=
:=:=:=
:=:=:= delay_ms(100);
:=:=:= set_pwm1_duty(value);
:=:=:=
:=:=:= delay_ms(50);
:=:=:=}
:=:=:=
:=:=:=}
___________________________
This message was ported from CCS's old forum
Original Post ID: 8917