Pin Changes when going for Pico W

[Myrmi123]

@NuclearPhoenixx : You mention several times that some internal pins change from the Pico to the Pico W board so the software needs to be modified. Which pins are this for example? I did a quick check and couldn't spot any difference.

[NuclearPhoenixx]

Hi there, there are a couple differences between internal pins.

Just had a quick google and copied text from the first result: https://core-electronics.com.au/guides/raspberry-pi-pico-w-vs-pico-whats-the-difference/... Quote:

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Of course, this is the big one. The major upgrade in the Pico W is support for wireless connectivity (2.4GHz wireless LAN b/g/n). The wireless interface (Infineon CYW43439) is driven by pins internal to the Pico W (not broken out to the headers). These are:

• GPIO29 (Input/Output) wireless SPI CLK/ADC mode (ADC3) measures VSYS/3
• GPIO25 SPI CS (Output) when high also enables GPIO29 ADC pin to read VSYS
• GPIO24 (Input/Output) wireless SPI data / IRQ
• GPIO23 (Output) wireless power-on signal

The wireless interface also brings a few new user-controllable pins to the mix:

• WL_GPIO2 – (Input) VBUS sense. HIGH when VBUS is present
• WL_GPIO1 – (Output) Controls onboard SMPS Power Save pin
• WL_GPIO0 – (Output) Controls user LED

This means that some internal pins on the Pico W are now repurposed for communication with the CYW43439, and have been replaced by GPIO present on the CY43439.

In summary, internal functions that have changed between models are:

Function	Pico	Pico W
User LED	GPIO25	WL_GPIO0
Power Supply PS	GPIO20	WL_GPIO1
VBUS sense	GPIO24	WL_GPIO2

On-board LED

Looking closer at the Wireless section, we can see that the user-LED is now controlled by the wireless module on pin WL_GPIO0. On the original Pico this was GPIO25, which is now reserved for SPI communication with the wireless module. This difference will probably affect the most users, because the onboard LED is a convenient debugging tool / status indicator.

[Myrmi123]

Ah, many thanks :)
Didn't see that. So VBUS cannot be measured anymore on the Pico W while using the wireless module. This shouldn't really matter as VBUS_MEAS is not necessary for operation according to your code. The LED can still be acessed through the wireless interface. I think I will order the Pico W and try to get it running.

[NuclearPhoenixx]

Yeah there aren't any important changes, so you should absolutely be able to use it with a Pico W by slightly altering the code. Glad I could help!