Difference between revisions of "RockpiS/hardware/gpio"

Revision as of 08:15, 26 March 2020

    ROCK Pi S >  Hardware >  GPIO

General purpose input-output (GPIO) connector

ROCK Pi S has two 26-pin expansion header. Each pin is distinguished by color.

More details about V10 Headers

• Pins marked with color orange are designed for default debug console.
• PWM: x3, PWM1/PWM2/PWM3
• SPI: x2, SPI0/SPI2
• I2C: x4, I2C0/I2C1/I2C2/I2C3
• UART: x3, UART0/UART1/UART2

More details about V11 Headers

• Pins marked with color orange are designed for default debug console.
• PWM: x3, PWM1/PWM2/PWM3
• SPI: x2, SPI0/SPI2
• I2C: x4, I2C0/I2C1/I2C2/I2C3
• UART: x3, UART0/UART1/UART2
• ADC: x1, ADC_IN0. The max input voltage is 1.8V.

More details about V12 Headers

• Pins marked with color orange are designed for default debug console.
• PWM: x2, PWM2/PWM3
• SPI: x1, SPI2
• I2C: x3, I2C0/I2C1/I2C3
• UART: x3, UART0/UART1/UART2
• ADC: x1, ADC_IN0. The max input voltage is 1.8V.

IO Voltage

RK3308 have two IO voltages, 1.8V/3.3V. For ROCK Pi S, the voltage level of GPIOs showed in the tables above are 3.3V and tolerance of those are 3.63V. For hardware V11 and V12, an ADC input is included (ADC_IN0). This ADC has an input voltage range of 0-1.8V.

GPIO number

Rockchip RK3308 GPIO has 5 banks, GPIO0 to GPIO4, each bank has 32pins, naming as below:

   GPIO0_A0 ~ A7 
   GPIO0_B0 ~ B7
   GPIO0_C0 ~ C7
   GPIO0_D0 ~ D7
   
   GPIO1_A0 ~ A7
   ....
   GPIO1_D0 ~ D7

For Rockchip 4.4 kernel, the GPIO number can be calculated as below, take GPIO4_D3(PIN8 on 26PIN GPIO) as an example:

   GPIO4_D3 = 32*4 + 8*3 + 3 = 155

To set GPIO4_D3 output

   cd /sys/class/gpio
   echo 155 > export
   cd gpio155
   echo out > direction
   echo 1 > value     # output high
   echo 0 > value     # output low