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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 Function6 GPIO number
+3.3V 1 2 +5.0V
490 I2C_EE_M3_SDA WORLD_SYNC GPIOA_14 3 4 +5.0V
491 I2C_EE_M3_SCL IR_REMOTE_IN GPIOA_15 5 6 GND
429 TDMC_DIN0 TDMC_D0 TSIN_B_VALID PWM_D GPIOZ_2 7 8 GPIOAO_0 UART_AO_A_TX 412
GND 9 10 GPIOAO_1 UART_AO_A_RX 413
430 TDMC_DIN1 TDMC_D1 TSIN_B_SOP GPIOZ_3 11 12 GPIOA_1 TDMB_SCLK TDMB_SLV_SCLK 477
431 TDMC_DIN2 TDMC_D2 TSIN_B_DIN0 GPIOZ_4 13 14 GND
432 TDMC_DIN3 TDMC_D3 TSIN_B_CLK GPIOZ_5 15 16 GPIOZ_8 ETH_RGMII_TX_CLK BT656_A_DIN4 TSIN_B_DIN2 MCLK_1 I2C_EE_M0_SCL 435
+3.3V 17 18 GPIOZ_6 TSIN_B_FAIL TDMC_FS TDMC_SLV_FS 433
447 SPI_B_MOSI UART_EE_C_RTS GPIOH_4 19 20 GND
448 TDMB_DIN3 TDMB_D3 PWM_F SPI_B_MISO UART_EE_C_CTS GPIOH_5 21 22 GPIOZ_9 ETH_TXEN BT656_A_DIN5 TSIN_B_DIN3 436
450 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 449
GND 25 26 SARADC_CH2
427 PWM_B I2C_EE_M0_SDA GPIOZ_0 27 28 GPIOZ_1 I2C_EE_M0_SCL PWM_C 428
419 TDMB_SLV_FS TDMB_FS TSIN_A_DIN0 GPIOAO_7 29 30 GND
480 PWM_D TDMB_DIN1 TDMB_D1 GPIOA_4 31 32 GPIOA_0 MCLK_0 476
420 TDMB_SLV_SCLK TDMB_SCLK TSIN_A_CLK UART_AO_B_TX GPIOAO_8 33 34 GND
478 TDMB_SLV_FS TDMB_FS GPIOA_2 35 36 GPIOA_3 TDMB_D0 TDMB_DIN0 479
421 MCLK_0 TSIN_A_VALID UART_AO_B_RX IR_REMOTE_OUT GPIOAO_9 37 38 GPIOA_5 PDM_DIN3 TDMB_DIN2 TDMB_D2 481
GND 39 40 GPIOZ_7 I2C_EE_M0_SDA TSIN_B_DIN1 TDMC_SCLK TDMC_SLV_SCLK 434

More details about 40-pin Header

The device number listed below is for reference only. Depending on how many devices you have enabled the number for each can change.

I2C devices (3)

  • I2C_EE_M0 (/dev/i2c-0)
  • I2C_EE_M1 (/dev/i2c-1)
  • I2C_EE_M3 (/dev/i2c-3)

I2S device (1)

  • TDMB

PWM devices (4)

  • PWM_B (/sys/class/pwm/pwmchip6/pwm1)
  • PWM_C (/sys/class/pwm/pwmchip4/pwm0)
  • PWM_D (/sys/class/pwm/pwmchip4/pwm1)
  • 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.

UART devices (3)

  • UART_AO_A (/dev/ttyAML0)
  • UART_AO_B (/dev/ttyAML6)
  • UART_EE_C (/dev/ttyAML7)

if you enable UART_AO_B only or only enable UART_EE_C, the UART device is /dev/ttyAML6, if you enable UART_AO_B and UART_EE_C at the same time, the device of UART_AO_B is /dev/ttyAML6, and UART_EE_C is /dev/ttyAML7

SPI device (1)

  • SPI_B (/dev/spidev0.0)

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.