I just got my Radxa NIO-12L set up ubuntu22.04 and I’d really like to make full use of the 40-pin header.
Right now I can’t find clear information about:
- How the 40-pin header pins are mapped to GPIO numbers
- Which device tree entries control those pins
- How to enable SPI and I2C/UART and i2s on those header pins
I have checked the available documentation and tools, but I don’t see anything that explains how to turn on SPI or how the GPIO lines are numbered for this board.
Could you please provide:
- A pinout / mapping for the 40-pin header (header pin → SoC pin → GPIO number),
- Instructions or a device tree example for enabling SPI on the header
(for example using SPIM1_CSB / SPIM1_CLK / SPIM1_MO / SPIM1_MI on GPIO136–139), - A minimal C/C++ example showing how to:
- Toggle a GPIO on the header using the recommended API,
- Use SPI from userspace (e.g. via /dev/spidevX.Y) on this board.