GPIOs
GPIO Pins
| Assigned To | Pin Nr. | Pin Nr. | Assigned To |
|---|---|---|---|
| 3.3 V | 1 | 2 | 5 V |
| GPIO1_C4 (I2C8_SDA) ^a^ | 3 | 4 | 5 V |
| GPIO1_C5 (I2C8_SCL) ^a^ | 5 | 6 | GND |
| GPIO4_D0 (CPU_GPCLK) | 7 | 8 | GPIO4_C4 (UART2_TX) |
| GND | 9 | 10 | GPIO4_C3 (UART2_RX) |
| GPIO1_C6 | 11 | 12 | GPIO3_D0 (I2S0_CLK) |
| GPIO1_C2 | 13 | 14 | GND |
| GPIO1_A1 | 15 | 16 | GPIO1_A4 |
| 3.3 V | 17 | 18 | GPIO4_C5 [SPDIF] |
| [UART4_TX] GPIO1_B0 (SPI1_TXD) | 19 | 20 | GND |
| [UART4_RX] GPIO1_A7 (SPI1_RXD) | 21 | 22 | GPIO4_D1 |
| GPIO1_B1 (SPI1_CLK) | 23 | 24 | GPIO1_B2 (SPI1_CSN0) |
| GND | 25 | 26 | GPIO1_B5 |
| GPIO1_B3 (I2C4_SDA) | 27 | 28 | GPIO1_B4 (I2C4_SCL) |
| GPIO4_D3 | 29 | 30 | GND |
| GPIO4_D4 | 31 | 32 | GPIO3_D4 (I2S0_SDI1SDO3) |
| GPIO3_D5 (I2S0_SDI2SDO2) | 33 | 34 | GND |
| GPIO3_D2 (I2S0_LRCKTX) | 35 | 36 | GPIO3_D6 (I2S0_SDI3SDO1) |
| GPIO3_D1 (I2S0_LRCKRX) | 37 | 38 | GPIO3_D3 (I2S0_SDI0) |
| GND | 39 | 40 | GPIO3_D7 (I2S0_SDO0) |
Notes:
- pulled high to 3.3V through 2.2kOhm resistor
Linux /dev/gpiochip Assignments
| Pin Nr. | Chip | Line |
|---|---|---|
| 3 | 1 | 20 |
| 5 | 1 | 21 |
| 7 | 4 | 24 |
| 8 | 4 | 20 |
| 10 | 4 | 19 |
| 11 | 1 | 22 |
| 12 | 3 | 24 |
| 13 | 1 | 18 |
| 15 | 1 | 1 |
| 16 | 1 | 4 |
| 18 | 4 | 21 |
| 19 | 1 | 8 |
| 21 | 1 | 7 |
| 22 | 4 | 25 |
| 23 | 1 | 9 |
| 24 | 1 | 10 |
| 26 | 1 | 13 |
| 27 | 1 | 11 |
| 28 | 1 | 12 |
| 29 | 4 | 27 |
| 31 | 4 | 28 |
| 32 | 3 | 28 |
| 33 | 3 | 29 |
| 35 | 3 | 26 |
| 36 | 3 | 30 |
| 37 | 3 | 25 |
| 38 | 3 | 27 |
| 40 | 3 | 31 |
On Linux, using the new /dev/gpiochip API, the _n_ in GPIO_n___XX_ appears to correlate to the number of the /dev/gpiochip_n_, and the _XX_ to the definition RK_P_XX_ of lines in include/dt-bindings/pinctrl/rockchip.h of the Linux kernel source. Having these named in the dts would be nice.
You can use libgpiod to drive them, and test them with the included tools (gpioinfo, gpioset, …)
For example, gpioset 4 25=1 (run as root) would turn pin 22 on. Do beware that poking the wrong GPIO pin can lock up your system.
The conversion table at right is also available as a C header file.
