General • Re: Can PWM count output pulses from PIO?

I verified that pwm_get_counter always returns 0
if I do not call gpio_set_function(gpio, GPIO_FUNC_PWM);
This is expected: peripherals can be connected to a pin only one at a time, so PWM cannot read output of PIO or SIO.
Note that SIO is special - SIO input is always connected, so software can check the state of GPIOs at any time.
(The same is true for most modern MCUs).

So, for now I will use second SM on PIO to count outputs of the first one:
set x, 0
next:
mov isr, x
wait 0 gpio x
wait 1 gpio x
jmp x-- next
jmp next
or, may be:
wait 1 irq 4

Statistics: Posted by jhnlmn — Fri Sep 27, 2024 8:18 am

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