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pwillard
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Joined: 07/06/2022
Location: United States
Posts: 329

Posted: 07:16pm 02 Jan 2026

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Trying new version 6 firmware on my old RP2040.

Now I'm confused.

Using the MANUAL example:

SETPIN GP21, DOUT
DO
PIN(GP21) = 1
PAUSE 300
PIN(GP21) = 0
PAUSE 300
LOOP

I get blinking on GPIO pin 16

Using this code:

SETPIN GP16, DOUT

DO
PIN(16) = 1
PAUSE 100
PIN(16) = 0
PAUSE 100
LOOP

I get fast blinking on pin 12.

???

lizby
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Joined: 17/05/2016
Location: United States
Posts: 3540

Posted: 07:29pm 02 Jan 2026

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Pin(16) is GP12. You must use either the pin numbers or the GP numbers--they aren't the same.

PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed

pwillard
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Joined: 07/06/2022
Location: United States
Posts: 329

Posted: 07:31pm 02 Jan 2026

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I think I forgot that... its been a while.

Mixtel90

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Joined: 05/10/2019
Location: United Kingdom
Posts: 8430

Posted: 08:14am 03 Jan 2026

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Please don't use hardware pin numbers at all if you can avoid it. Doing so can completely screw up compatibility between your software and different hardware platforms. :( The chip itself uses the GPIOxx format, which MMBasic kindly abbreviates to GPxx to save our poor fingers, the I and O keys.

Mick

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Canada_Cold
Regular Member

Joined: 11/01/2020
Location: Canada
Posts: 50

Posted: 12:31pm 09 Jan 2026

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Hi,

Regarding using GPxx numbers rather than pin numbers, is there a way to address the GPxx as a variable?

In the following code snippet I used the pin number;

DIM INTEGER PINOUT
PINOUT = 14 ' GPIO10
SETPIN PINOUT, DOUT
PIN(PINOUT) = 0 ' Pinout = low

Is there a better way to do this?

Don

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 5601

Posted: 12:40pm 09 Jan 2026

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Hi Don,

there is a way using pin numbers derived from GPxx.

CONST pinout=MM.INFO(PINNO GP10) 'there is a number associated to GP10
SETPIN pinout,DOUT
PIN(pinout)=0

Why is this better ? Simply because pin 14 is connected to GP10 in a genuine RP pico, but in a different board it could be on a different pin (i.e. 16). And GP10 is universal.

Volhout
Edited 2026-01-09 22:50 by Volhout

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