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akin54
Joined: 11 Jan 2021
Posts: 7
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| GENERATING PWM USING THE TIMER |
 Posted: Fri Mar 04, 2022 12:27 am |
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Hello everyone.
I want to generate pwm from this processor (PIC12F683) without using the ccp1 leg. I want to use the GP5(A5) pin for this operation. The electronic card circuit I have drawn does not allow other conditions. When I try to generate pwm with interrupt using timer, the while loop of my program starts to crash. While I am creating a continuous pwm signal, I want to operate comfortably in my while loop. I would be glad if you help. Thanks in advance.
| Code: | #include <12F683.h>
#device ADC=10
#use delay(internal=8000000) |
| Code: | #include <main.h>
#FUSES NOMCLR //MCLR = A3 pin
void main()
{
setup_adc_ports(sAN2, VSS_VDD);
setup_adc(ADC_CLOCK_DIV_2);
port_a_pullups(0x0A);
set_tris_a(0x0E);
output_a(0x00);
while(TRUE)
{
if(input(pin_a3)==0)
{
output_high(pin_a1);
delay_ms(1000);
output_low(pin_a1);
}
}
} |
_________________
@electsoftware |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Fri Mar 04, 2022 1:08 am |
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| Quote: |
When I try to generate pwm with interrupt using timer, the while loop
of my program starts to crash.
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Post your code for the timer interrupt. Post the code in main() that
enables it, and post the interrupt routine. You left that code out of
your posted program.
| Quote: | | port_a_pullups(0x0A); |
Here, you think a weak pullup is enabled on pins A1 and A3.
But pin A3 doesn't have that ability. Look at this diagram on page 36:
REGISTER 4-4: WPU: WEAK PULL-UP REGISTER
It shows no pullup is available on pin A3 when using the NOMCLR fuse.
12F683 data sheet:
https://ww1.microchip.com/downloads/en/DeviceDoc/41211D_.pdf
This line sets all pins as outputs, unless you have a secret
#use fast_io(a) statement that you didn't post. |
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akin54
Joined: 11 Jan 2021
Posts: 7
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| Posted: Fri Mar 04, 2022 1:49 am |
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| Code: | #include <main.h>
#FUSES NOMCLR //MCLR = A3 pin
#int_timer2
void timer2 ()
{
output_high(pin_a5);
delay_us(12);
output_low(pin_a5);
}
void main()
{
setup_timer_2(T2_DIV_BY_1,1,1);
setup_adc_ports(sAN2, VSS_VDD);
setup_adc(ADC_CLOCK_DIV_2);
port_a_pullups(0x02);
set_tris_a(0x0E);
output_a(0x0E);
enable_interrupts(INT_timer2) ;
enable_interrupts(GLOBAL);
while(TRUE)
{
if(input(pin_a3)==0)
{
output_high(pin_a0);
delay_ms(1000);
output_low(pin_a0);
}
}
} |
_________________
@electsoftware |
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akin54
Joined: 11 Jan 2021
Posts: 7
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| Posted: Fri Mar 04, 2022 1:50 am |
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Yes, now I see. I made the MCLR pin a hardware button.
_________________
@electsoftware |
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