Control the on-board RGB LED They are active-low and shared with the iCE40:
- A LED will be bright if either the iCE40 or RP2040 are pulling its line low.
- A LED will be dark if none of the iCE40 or RP2040 are pulling its line low.
A line pulled high does not give consitent result, they are controlled with high-impedance or pulled-down.
Initialise the GPIO pins for use with open-drain LED control, shared with the iCE40.
on- sets the LED bright if true, dark if false.
Control for the individual red, green, blue LED.
Unlike the Raspberry Pi Pico board, which has a green LED attached to the GPIO pin 25, the pico-ice has three LEDs attached to the RP2040 GPIO13 (red), GPIO12 (green), GPIO15 (blue).
Moreover, the leds are “active-low”, so you would need to turn their pin down for them to be turned on.
Finally, the FPGA is also connected to these LEDs.