PIO program refuse to load: wait instruction need to have the GPIO nb-16 if pio_gpio_base is 16

[FreddyVRetro]

Hi,

I did a code that need pio_gpio_base set to 16.
However, we must use the GPIO pin number -16 in the wait instruction.

if we do this, the pio asm set the used_gpio_range to 2, and the sdk refuse to load the program with the return code -11

GPIO used for the wait : Pin 30 then goes to 14 when we remove 16.

I had to send the instruction via the register X, then do "mov exec,X" to have it doing the wait on the correct pin.
(It works like that)

[lurch]

Are you using the RP2350B ?

[FreddyVRetro]

Yes of course Le lun. 10 mars 2025, 14:12, Andrew Scheller ***@***.***> a écrit :

…

Are you using the RP2350B ? — Reply to this email directly, view it on GitHub <#2342 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ASCSLB7TGCATENCFHBARCHD2TWFTVAVCNFSM6AAAAABYWCB4LCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDOMJQGU2TKNJYGM> . You are receiving this because you authored the thread.Message ID: ***@***.***> [image: lurch]*lurch* left a comment (raspberrypi/pico-sdk#2342) <#2342 (comment)> Are you using the RP2350B ? — Reply to this email directly, view it on GitHub <#2342 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ASCSLB7TGCATENCFHBARCHD2TWFTVAVCNFSM6AAAAABYWCB4LCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDOMJQGU2TKNJYGM> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[peterharperuk]

Is PICO_PIO_USE_GPIO_BASE == 1 ?

[FreddyVRetro]

Yes as well. Envoyé à partir de Outlook pour Android<https://aka.ms/AAb9ysg>

…

________________________________ From: Peter Harper ***@***.***> Sent: Monday, March 10, 2025 2:41:57 PM To: raspberrypi/pico-sdk ***@***.***> Cc: FreddyV ***@***.***>; Author ***@***.***> Subject: Re: [raspberrypi/pico-sdk] PIO program refuse to load: wait instruction need to have the GPIO nb-16 if pio_gpio_base is 16 (Issue #2342) Is PICO_PIO_USE_GPIO_BASE == 1 ? — Reply to this email directly, view it on GitHub<#2342 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ASCSLB4WZTUQ6O3VU53GB7D2TWJCLAVCNFSM6AAAAABYWCB4LCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDOMJQGYZTQNBXHA>. You are receiving this because you authored the thread.Message ID: ***@***.***> [peterharperuk]peterharperuk left a comment (raspberrypi/pico-sdk#2342)<#2342 (comment)> Is PICO_PIO_USE_GPIO_BASE == 1 ? — Reply to this email directly, view it on GitHub<#2342 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ASCSLB4WZTUQ6O3VU53GB7D2TWJCLAVCNFSM6AAAAABYWCB4LCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDOMJQGYZTQNBXHA>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[FreddyVRetro]

Hi again.

it is not that it does not work.
I did prove that it work by modifying the PIO code from the Core, after loading the PIO program.

It is just the PIO program load that return an error, but it is correct... the wait instruction need a value <32, then the gpio number need to be reduced by 16.

Maybe the PIO asm does it if the pio_gpio_offset is set in the C portion of the .pio code ?

[kilograham]

would be helpful to know what SDK version you are using, and to give some example code

[FreddyVRetro]

Hi,
SDK 12.2.1

This is simple to reproduce, just set pio_gpio_base to 16

if we do a "wait 0 gpio 30" for example, it will be compiles as 30, not 14....
if we do "wait 0 gpio 14", the sdk will refuse it because 14 is < 16....

This is when the pio_gpio_base fonction is called in the main c code, not in the .pio file.

So, my question is are we obliged to do the pio_gpio_base in the .pio file, so that the asm detect it ?

[kilograham]

you do have to set the gpio base before you load the program.

Example code is still helpful, even if a few lines of loading, and the source PIO, because otherwise we have to write it again to try and repro

[kilograham]

Please attach a snippet of an actual .pio file and .c code that show the problem. Even your "simple" repro steps are far from clear.

"just set pio_gpio_base to 16" - where in the code?
"This is when the pio_gpio_base fonction is called in the main c code, not in the .pio file." presumably you mean pio_set_gpio_base - what does "called from the .pio file" mean? if you mean in c code embedded in the .pio file then these are largely equivalent

Also, how are you loading the PIO program and initializing the PIO instance? (hence why .c code is helpful)

Note, if you call pio_set_gpio_base(pio, 16) then try to load a program with a wait 0 gpio 14 then of course the function refuses as you cannot reference pin 14 when gpio base is 16