Open hardware RP2040 dev board in a Raspberry Pi Zero compatible form factor. Includes Mini HDMI (via bitbanged DVI) and microSD.
This board aids with migrating a project from the Pi Zero to the RP2040 while retaining the option of moving back to the Pi Zero in the future. It has the same footprint as the Pi Zero and a partially compatible pinout, making it convenient to support both the RP2040 and Pi Zero in the same design.
Works, but 1 of 2 boards received by JLCPCB had a solder bridge on the RP2040. Looking at JLCPCB's EasyEDA footprints, it looks like JLCPCB used longer pads for the RP2040. I'd recommend using a custom footprint and extending the pads, which hopefully will avoid defects.
A couple other things I'd change in retrospect:
- Expose UART TX/RX on the debug header and reorder pins so you can plug a picoprobe into the board w/o wires.
- Remove the hacky activity LED from the microSD since the lib already blinks GP25.
- Try for a 2 layer board to reduce cost
- Reduce buttons to 6 x 3.5 and maybe try to squeeze in an optional wireless module
DVI and microSD both appear to work with a basic test. I've exercised DVI, USB (host), SPI1, and the debug header quite a bit (all good). Other functionality is either lightly tested or untested.
- Compatible footprint:
- Mini HDMI (via bitbanged DVI)
- Micro SD (via SPI mode. Cards must be <2TB)
- Micro USB
- Power (via Micro USB)
- Partially compatible pinout
- 16MB Flash
- Green status LED on GP25 (same as Pico)
- Red SD activity LED on GP9
- BOOTSEL and RESET buttons
- SWD Header
See schematic for more details.
| Pi Pin | Pico Pin | Pi GPIO | Pico GP | Function | Notes |
|---|---|---|---|---|---|
| 1, 17 | 36 | 3V3 (Out) | |||
| 2, 4 | 39 | VSYS | |||
| 2, 4 | 40 | VBUS | |||
| 3 | 4 | GPIO 02 | GP 02 | I2C_SDA | |
| 5 | 5 | GPIO 03 | GP 03 | I2C_SCL | |
| 6, 9, 14, 20, 25, 30, 34, 39 | 3, 8, 13, 18, 23, 28, 33, 38, DBG-2 | GND | |||
| 7 | GPIO 04 | GP 24 | |||
| 8 | 1 | GPIO 14 | GP 00 | UART0 TX | |
| 10 | 2 | GPIO 15 | GP 01 | UART0 RX | |
| 11 | 12 | GPIO 17 | GP 09 | SD_CSn | Can be used as GP with SD card removed. Note 10k pullup. |
| 12 | 17 | GPIO 18 | GP 13 | SPI1_CSn | Can be used to share SPI1 with SD card. |
| 13 | 11 | GPIO 27 | GP 08 | SD_DET | Can be used as GP with SD card removed. |
| 15 | 14 | GPIO 22 | GP 10 | DVI_CEC | DVI_CEC when JP3 closed. See schematic. |
| 16 | 15 | GPIO 23 | GP 11 | ||
| 18 | DBG-3 | GPIO 24 | SWD | ||
| 19 | 6/10 | GPIO 10 | GP 04/07 | SPI0_RX/TX | Select controller or peripheral via JP1 and JP2. See schematic. |
| 21 | 10/6 | GPIO 09 | GP 07/04 | SPI0_TX/RX | Select controller or peripheral via JP1 and JP2. See schematic. |
| 22 | DBG-1 | GPIO 25 | SWCLK | ||
| 23 | 9 | GPIO 11 | GP 06 | SPI0_SCLK | |
| 24 | 7 | GPIO 08 | GP 05 | SPI0_CSn | |
| 26 | GPIO 07 | ||||
| 27 | 34 | GPIO 00 | GP 28 | I2C_SCL | DVI_SDA when JP4 closed. See schematic. |
| 28 | GPIO 01 | GP 29 | |||
| 29 | 31 | GPIO 05 | GP 26 | ||
| 31 | 32 | GPIO 06 | GP 27 | I2C_SDA | DVI_SDA when JP5 closed. See schematic. |
| 32 | GPIO 12 | ||||
| 33 | GPIO 13 | ||||
| 35 | 16 | GPIO 19 | GP 12 | SPI1_RX / SD_DAT | Can be used as GP with SD card removed. Note 10k pullup. |
| 36 | GPIO 16 | BOOTSEL | |||
| 37 | 30 | GPIO 26 | RUN | ||
| 38 | 20 | GPIO 20 | GP 15 | SPI1_TX / SD_CMD | Can be used as GP with SD card removed. |
| 40 | 19 | GPIO 21 | GP 14 | SPI1_SCLK / SD_CLK | Can be used as GP with SD card removed. |
| GP 23 | DVI_D2+ | ||||
| 21 | GP 16 | DVI_CK- | |||
| 22 | GP 17 | DVI_CK+ | |||
| 24 | GP 18 | DVI_D0- | |||
| 25 | GP 19 | DVI_D0+ | |||
| 26 | GP 20 | DVI_D1- | |||
| 27 | GP 21 | DVI_D1+ | |||
| 29 | GP 22 | DVI_D2- | |||
| 35 | N/C | ||||
| 37 | 3V3_EN | ||||
| LED | GP 25 |
(Click image to view PDF)
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