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pio_encode_wait_gpio does not respect gpiobase=16 #2377

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opened 2025-03-27 10:30:58 -05:00 by qdotme · 2 comments

qdotme commented

2025-03-27 10:30:58 -05:00

(Migrated from github.com)

Consider the following (equivalent) blocks - one stalling on PIO, one on SIO. Got it to working by manually substracting the 16 from the GPIO pin number (pin_vsync = 45 in my design).

The PIO is correctly configured for supporting gpio_base=16, compiling the pioasm instructions correctly - but not when generated through pio_encode_wait_gpio

#if 1
pio_sm_exec(config->pio, config->pio_sm, 
	pio_encode_wait_gpio(1, config->pin_vsync - 16));
#else
while (gpio_get(config->pin_vsync) == 0);
#endif

Consider the following (equivalent) blocks - one stalling on PIO, one on SIO. Got it to working by manually substracting the 16 from the GPIO pin number (pin_vsync = 45 in my design). The PIO is correctly configured for supporting gpio_base=16, compiling the pioasm instructions correctly - but not when generated through `pio_encode_wait_gpio` ``` #if 1 pio_sm_exec(config->pio, config->pio_sm, pio_encode_wait_gpio(1, config->pin_vsync - 16)); #else while (gpio_get(config->pin_vsync) == 0); #endif ```

kilograham commented

2025-03-27 11:16:48 -05:00

(Migrated from github.com)

I guess this is really a documentation issue

Worth looking at any similar functions and see if it is worth adding a variant which takes a PIO instance

I guess this is really a documentation issue Worth looking at any similar functions and see if it is worth adding a variant which takes a PIO instance

kilograham commented

2025-07-25 09:45:48 -05:00

(Migrated from github.com)

fix merged into develop; will be in next docs release

fix merged into develop; will be in next docs release

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