Built-in LED

Pico W/Pico 2 W use reserved GPIOs 23, 24, 25, and 29 to control the CYW43 chip. GPIO25, used for the built-in LED on Pico/Pico 2, is now used for CYW43 control, so the built-in LED is connected to the CYW43 chip’s GPIO. To control the LED on Pico W/Pico 2 W, you must communicate with the CYW43 chip, which is tricky. The Pico SDK provides cyw43_arch_gpio_get() and cyw43_arch_gpio_put() APIs for this purpose.