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PWM shuts off unexpectedly for 16LF1503

 
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randy.shaffer



Joined: 21 Mar 2018
Posts: 51

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PWM shuts off unexpectedly for 16LF1503
PostPosted: Fri Oct 11, 2024 12:21 pm     Reply with quote
Code:
#include <16LF1503.h> // device file
#fuses NOWDT, NOBROWNOUT
#use delay(internal = 16MHZ)
#use PWM(PWM1, FREQUENCY = 15.625kHz, OUTPUT = PIN_C5, PWM_OFF, STREAM = IN1)
#byte PORTC = 0x00E
#bit IN2 = PORTC.3
void main()
{
 set_tris_c(0b00000100); // X: C7,C6. Inputs: C2. Outputs: C5,C4,C3,C1,C0.
 IN2 = FALSE;
 delay_ms(100); // supply voltage settling time
 pwm_set_duty_percent(IN1, 1000);
 pwm_on(IN1);
 delay_ms(1000); // 100% duty for 1 second
 pwm_set_duty_percent(IN1, 500); // after 1 second, reduce duty to 50%
 pwm_on(IN1);
 while(TRUE);
}


Compiler is v5.118. Program outputs 100% duty initially. After one second, I wanted to drop the duty ratio to 50%, but it drops to zero instead. Thanks for having a look.
Ttelmah



Joined: 11 Mar 2010
Posts: 19495

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PostPosted: Sat Oct 12, 2024 7:48 am     Reply with quote
Cannot see any reason why. Looking at the assembly this generates the
value is sensible.
You don't need to enable the PWM a second time.

I think you need to narrow down whether the chip might be stopping
for some other reason. Leave the 100% running for 5 seconds. Does the
output stay running?.
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