Quick Start Guide

Flashing

The reset button will be the first thing you have to use when getting your Gemini. You can reset the board with a short click and enter the bootloader with a long (>500ms) click of the button. reset-button

ESD protection

Gemini has an ESD protection chip onboard. This way your controller is protected against electrostatic discharge. The D+ and D- pads can also be used while maintaining ESD protection by using all 4 pads under the usb port to connect an external usb port. ESD

Split capability

Gemini also supports VBUS detection for split keyboards by connecting the jumper and sensing on GP19. Read more about that here. VBUS

LEDs

It features a aRGB LED, that you can program yourself. It’s connected to the 3.3V to 5V signal levelshifter (SN74LVC1T45) to improve stability and longevity of the LEDs. If you want to disable the onboard LED and just control the LEDs conneted to GP16 you skip the first LED in firmware. (RP2040.GP16 -> levelshifter -> onboard LED -> Gemini.GP16) LED

Pinout

Top

top-pinout

Bottom

bottom-pinout

Alternate functions

Each pin on the rp2040 serves multiple purposes - enabling extremely flexible I/O:

GPIOF1F2F3F4F5F6F7F8F9
0SPI0 RXUART0 TXI2C0 SDAPWM0 ASIOPIO0PIO1USB OVCUR DET
1SPI0 CSnUART0 RXI2C0 SCLPWM0 BSIOPIO0PIO1USB VBUS DET
2SPI0 SCKUART0 CTSI2C1 SDAPWM1 ASIOPIO0PIO1USB VBUS EN
3SPI0 TXUART0 RTSI2C1 SCLPWM1 BSIOPIO0PIO1USB OVCUR DET
4SPI0 RXUART1 TXI2C0 SDAPWM2 ASIOPIO0PIO1USB VBUS DET
5SPI0 CSnUART1 RXI2C0 SCLPWM2 BSIOPIO0PIO1USB VBUS EN
6SPI0 SCKUART1 CTSI2C1 SDAPWM3 ASIOPIO0PIO1USB OVCUR DET
7SPI0 TXUART1 RTSI2C1 SCLPWM3 BSIOPIO0PIO1USB VBUS DET
8SPI1 RXUART1 TXI2C0 SDAPWM4 ASIOPIO0PIO1USB VBUS EN
9SPI1 CSnUART1 RXI2C0 SCLPWM4 BSIOPIO0PIO1USB OVCUR DET
10SPI1 SCKUART1 CTSI2C1 SDAPWM5 ASIOPIO0PIO1USB VBUS DET
11SPI1 TXUART1 RTSI2C1 SCLPWM5 BSIOPIO0PIO1USB VBUS EN
12SPI1 RXUART0 TXI2C0 SDAPWM6 ASIOPIO0PIO1USB OVCUR DET
13SPI1 CSnUART0 RXI2C0 SCLPWM6 BSIOPIO0PIO1USB VBUS DET
14SPI1 SCKUART0 CTSI2C1 SDAPWM7 ASIOPIO0PIO1USB VBUS EN
15SPI1 TXUART0 RTSI2C1 SCLPWM7 BSIOPIO0PIO1USB OVCUR DET
16SPI0 RXUART0 TXI2C0 SDAPWM0 ASIOPIO0PIO1USB VBUS DET
17SPI0 CSnUART0 RXI2C0 SCLPWM0 BSIOPIO0PIO1USB VBUS EN
18SPI0 SCKUART0 CTSI2C1 SDAPWM1 ASIOPIO0PIO1USB OVCUR DET
19SPI0 TXUART0 RTSI2C1 SCLPWM1 BSIOPIO0PIO1USB VBUS DET
20SPI0 RXUART1 TXI2C0 SDAPWM2 ASIOPIO0PIO1CLOCK GPIN0USB VBUS EN
21SPI0 CSnUART1 RXI2C0 SCLPWM2 BSIOPIO0PIO1CLOCK GPOUT0USB OVCUR DET
22SPI0 SCKUART1 CTSI2C1 SDAPWM3 ASIOPIO0PIO1CLOCK GPIN1USB VBUS DET
23SPI0 TXUART1 RTSI2C1 SCLPWM3 BSIOPIO0PIO1CLOCK GPOUT1USB VBUS EN
24SPI1 RXUART1 TXI2C0 SDAPWM4 ASIOPIO0PIO1CLOCK GPOUT2USB OVCUR DET
25SPI1 CSnUART1 RXI2C0 SCLPWM4 BSIOPIO0PIO1CLOCK GPOUT3USB VBUS DET
26SPI1 SCKUART1 CTSI2C1 SDAPWM5 ASIOPIO0PIO1USB VBUS EN
27SPI1 TXUART1 RTSI2C1 SCLPWM5 BSIOPIO0PIO1USB OVCUR DET
28SPI1 RXUART0 TXI2C0 SDAPWM6 ASIOPIO0PIO1USB VBUS DET
29SPI1 CSnUART0 RXI2C0 SCLPWM6 BSIOPIO0PIO1USB VBUS EN
Edit this page on GitHub
Information →