Zero2/Hardware/GPIO
Radxa Zero 2 > Hardware > GPIO
General purpose input-output (GPIO) connector
Radxa Zero 2 has a 40-pin expansion header. Each pin is distinguished by color.
| GPIO number | Function6 | Function5 | Function4 | Function3 | Function2 | Function1 | Pin# | Pin# | Function1 | Function2 | Function3 | Function4 | Function5 | GPIO number | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| +3.3V | 1 | 2 | +5.0V | ||||||||||||
| I2C_EE_M3_SDA | WORLD_SYNC | GPIOA_14 | 3 | 4 | +5.0V | ||||||||||
| I2C_EE_M3_SCL | IR_REMOTE_IN | GPIOA_15 | 5 | 6 | GND | ||||||||||
| TDMC_DIN0 | TDMC_D0 | TSIN_B_VALID | PWM_D | GPIOZ_2 | 7 | 8 | GPIOAO_0 | UART_AO_A_TX | |||||||
| GND | 9 | 10 | GPIOAO_1 | UART_AO_A_RX | |||||||||||
| TDMC_DIN1 | TDMC_D1 | TSIN_B_SOP | GPIOZ_3 | 11 | 12 | GPIOA_1 | TDMB_SCLK | TDMB_SLV_SCLK | |||||||
| TDMC_DIN2 | TDMC_D2 | TSIN_B_DIN0 | GPIOZ_4 | 13 | 14 | GND | |||||||||
| TDMC_DIN3 | TDMC_D3 | TSIN_B_CLK | GPIOZ_5 | 15 | 16 | NC | |||||||||
| +3.3V | 17 | 18 | GPIOZ_6 | TSIN_B_FAIL | TDMC_FS | TDMC_SLV_FS | |||||||||
| SPI_B_MOSI | UART_EE_C_RTS | GPIOH_4 | 19 | 20 | GND | ||||||||||
| TDMB_DIN3 | TDMB_D3 | PWM_F | SPI_B_MISO | UART_EE_C_CTS | GPIOH_5 | 21 | 22 | SARADC_CH3 | |||||||
| PWM_B | I2C_EE_M1_SCL | SPI_B_SCLK | UART_EE_C_TX | GPIOH_7 | 23 | 24 | GPIOH_6 | UART_EE_C_RX | SPI_B_SS0 | I2C_EE_M1_SDA | IR_REMOTE_OUT | ||||
| GND | 25 | 26 | SARADC_CH2 | ||||||||||||
| PWM_B | I2C_EE_M0_SDA | GPIOZ_0 | 27 | 28 | GPIOZ_1 | I2C_EE_M0_SCL | PWM_C | ||||||||
| TDMB_SLV_FS | TDMB_FS | TSIN_A_DIN0 | GPIOAO_7 | 29 | 30 | GND | |||||||||
| TDMC_SLV_FS | TDMC_FS | GPIOA_13 | 31 | 32 | GPIOA_0 | MCLK_0 | |||||||||
| TDMB_SLV_SCLK | TDMB_SCLK | TSIN_A_CLK | UART_AO_B_TX | GPIOAO_8 | 33 | 34 | GND | ||||||||
| TDMB_SLV_FS | TDMB_FS | GPIOA_2 | 35 | 36 | GPIOC_7 | PCIECK_REQN | WORLD_SYNC | ||||||||
| MCLK_0 | TSIN_A_VALID | UART_AO_B_RX | IR_REMOTE_OUT | GPIOAO_9 | 37 | 38 | GPIOA_5 | PDM_DIN3 | TDMB_DIN2 | TDMB_D2 | |||||
| GND | 39 | 40 | GPIOZ_7 | I2C_EE_M0_SDA | TSIN_B_DIN1 | TDMC_SCLK | TDMC_SLV_SCLK |
More details about 40-pin Header
I2C devices (3)
- I2C_EE_M0 (/dev/i2c-0)
- I2C_EE_M1 (/dev/i2c-1)
- I2C_EE_M3 (/dev/i2c-3)
PWM devices (4)
- PWM_B (/sys/class/pwm/pwmchip0/pwm0)
- PWM_C (/sys/class/pwm/pwmchip1/pwm0)
- PWM_D (/sys/class/pwm/pwmchip1/pwm0)
- PWM_F (/sys/class/pwm/pwmchip2/pwm1)
To use PWM_C and PWM_D together, please use meson-g12b-pwm-c-d-gpioz-1-2 overlay instead of individual overlays. In this case PWM_D will be available at /sys/class/pwm/pwmchip1/pwm1.
UART devices (3)
- UART_AO_A (/dev/ttyAML0)
- UART_AO_B (/dev/ttyAML1)
- UART_EE_C (/dev/ttyAML4)
UART_AO_A is enabled by default even without specifying an overlay.
SPI device (1)
- SPI_B (/dev/spidev1.0)
GPIO number
| GPIO Chip |
GPIO Name |
Base | Offset | Formula |
|---|---|---|---|---|
| First | GPIOAO_x | 412 | 0-11 | Base + Offset |
| First | GPIOE_x | 424 | 0-2 | Base + Offset |
| Second | GPIOZ_x | 427 | 0-15 | Base + Offset |
| Second | GPIOH_x | 443 | 0-8 | Base + Offset |
| Second | BOOT_x | 452 | 0-15 | Base + Offset |
| Second | GPIOC_x | 468 | 0-7 | Base + Offset |
| Second | GPIOA_x | 476 | 0-15 | Base + Offset |
| Second | GPIOX_x | 492 | 0-19 | Base + Offset |
Take GPIOX_10 as an example.
The base is 492 and the offset is 10. So the GPIOX_10's GPIO number is 492+10=502.
We recommend you to use gpiod and libmraa, which support accessing GPIO pins by 40-pin header number, instead of SoC defined GPIO number.