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    [[rock3 | ROCK 3]] > [[rock3/hardware | Hardware]] > [[rock3/hardware/rock3a-gpio | ROCK 3A GPIO]]

== <span id="gpio">General purpose input-output (GPIO) connector</span> ==

ROCK 3 has a 40-pin expansion header. Each pin is distinguished by color.

<div class="col-md-12 ">
    <div class="panel panel-midnight-white">
        <div class="panel-heading"><h3>Hardware V1.2</h3></div>
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{| class="wikitable" style="vertical-align:middle;"
|- style="font-weight:bold; text-align:center;"
! GPIO number
! Function4
! Function3
! Function2
! Function1
! Pin#
! 
! Pin#
! Function1
! Function2
! Function3
! Function4
! GPIO number
|-
| 
| 
| 
| 
| +3.3V
| style="background-color:#FF0;" | 1
| 
| style="background-color:#F00;" | 2
| +5.0V
| 
| 
| 
| 
|-
| 32
| CAN1_RX_M0
| UART3_RX_M0
| I2C3_SDA_M0
| GPIO1_A0
| style="background-color:#008000; color:#FFF;" | 3
| 
| style="background-color:#F00;" | 4
| +5.0V
| 
| 
| 
| 
|-
| 33
| CAN1_TX_M0
| UART3_TX_M0
| I2C3_SCL_M0
| GPIO1_A1
| style="background-color:#008000; color:#FFF;" | 5
| 
| style="background-color:#000; color:#FFF" | 6
| GND
| 
| 
| 
| 
|-
| 111
| 
| UART3_TX_M1
| PWM12_M0
| GPIO3_B7
| style="background-color:#008000; color:#FFF;" | 7
| 
| style="background-color:#008000; color:#FFF;" | 8
| GPIO0_D1
| style="background-color:#FFA500;" | UART2_TXD
| 
| 
| 25
|-
| 
| 
| 
| 
| GND
| style="background-color:#000; color:#FFF" | 9
| 
| style="background-color:#008000; color:#FFF;" | 10
| GPIO0_D0
| style="background-color:#FFA500;" | UART2_RXD
| 
| 
| 24
|-
| 116
| 
| UART7_TX_M1
| PWM14_M0
| GPIO3_C4
| style="background-color:#008000; color:#FFF;" | 11
| 
| style="background-color:#008000; color:#FFF;" | 12
| GPIO3_A3
| 
| 
| 
| 99
|-
| 117
| 
| UART7_RX_M1
| PWM15_IR_M0
| GPIO3_C5
| style="background-color:#008000; color:#FFF;" | 13
| 
| style="background-color:#000; color:#FFF" | 14
| GND
| 
| 
| 
| 
|-
| 16
| 
| UART0_RX
| PWM1_M0
| GPIO0_C0
| style="background-color:#008000; color:#FFF;" | 15
| 
| style="background-color:#008000; color:#FFF;" | 16
| GPIO3_A1
| SPI1_CS0_M1
| 
| 
| 97
|-
| 17
| 
| UART0_TX
| PWM2_M0
| GPIO0_C1
| style="background-color:#FF0;" | 17
| 
| style="background-color:#008000; color:#FFF;" | 18
| GPIO3_B2
| UART4_TX_M1
| PWM9_M0
| 
| 106
|-
| 147
| CAN1_TX_M1
| SPI3_MOSI_M1
| PWM15_IR_M1
| GPIO4_C3
| style="background-color:#008000; color:#FFF;" | 19
| 
| style="background-color:#000; color:#FFF" | 20
| GND
| 
| 
| 
| 
|-
| 149
| UART9_TX_M1
| SPI3_MISO_M1
| PWM12_M1
| GPIO4_C5
| style="background-color:#008000; color:#FFF;" | 21
| 
| style="background-color:#008000; color:#FFF;" | 22
| ADC_IN5
| 
| 
| 
| 
|-
| 146
| CAN1_RX_M1
| SPI3_CLK_M1
| PWM14_M1
| GPIO4_C2
| style="background-color:#008000; color:#FFF;" | 23
| 
| style="background-color:#008000; color:#FFF;" | 24
| GPIO4_C6
| PWM13_M1
| SPI3_CS0_M1
| UART9_RX_M1
| 150
|-
| 
| 
| 
| 
| GND
| style="background-color:#000; color:#FFF" | 25
| 
| style="background-color:#008000; color:#FFF;" | 26
| GPIO4_D1
| SPI3_CS1_M1
| 
| 
| 153
|-
| 14
| PWM2_M1
| SPI0_MOSI_M0
| I2C2_SDA_M0
| GPIO0_B6
| style="background-color:#00F; color:#FFF;" | 27
| 
| style="background-color:#00F; color:#FFF;" | 28
| GPIO0_B5
| I2C2_CLK_M0
| SPI0_CLK_M0
| PWM1_M1
| 13
|-
| 95
| 
| UART8_TX_M1
| SPI2_MISO_M1
| GPIO2_D7
| style="background-color:#008000; color:#FFF;" | 29
| 
| style="background-color:#000; color:#FFF" | 30
| GND
| 
| 
| 
| 
|-
| 96
| 
| UART8_RX_M1
| SPI2_CLK_M1
| GPIO3_A0
| style="background-color:#008000; color:#FFF;" | 31
| 
| style="background-color:#008000; color:#FFF;" | 32
| GPIO3_C2
| SPI1_MISO_M1
| UART5_TX_M1
| 
| 114
|-
| 115
| 
| UART5_RX_M1
| SPI1_CLK_M1
| GPIO3_C3
| style="background-color:#008000; color:#FFF;" | 33
| 
| style="background-color:#000; color:#FFF" | 34
| GND
| 
| 
| 
| 
|-
| 100
| 
| 
| 
| GPIO3_A4
| style="background-color:#008000; color:#FFF;" | 35
| 
| style="background-color:#008000; color:#FFF;" | 36
| GPIO3_A2
| 
| 
| 
| 98
|-
| 112
| 
| UART3_RX_M1
| PWM13_M0
| GPIO3_C0
| style="background-color:#008000; color:#FFF;" | 37
| 
| style="background-color:#008000; color:#FFF;" | 38
| GPIO3_A6
| 
| 
| 
| 102
|-
| 
| 
| 
| 
| GND
| style="background-color:#000; color:#FFF" | 39
| 
| style="background-color:#008000; color:#FFF;" | 40
| GPIO3_A5
| 
| 
| 
| 101
|}

        </div>
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</div>

<div class="clearfix"></div>

==== More details about 40-pin Header ====

* Pins marked with color orange are designed for debug console.
* PWM; x6, PWM1/PWM2/PWM12/PWM13/PWM14/PWM15
* SPI: x1, SPI3
* I2C: x2, I2C2/I2C3
* UART: x5, UART0/UART3/UART5/UART7/UART9
* ADC: x1, ADC_IN5
* CAN: x1, CAN1

=== IO Voltage ===

RK3568 have three IO voltages, 1.8V/3.3V. For ROCK 3, the high level voltage of GPIO pin on 40-PIN HEADER is 3.3V.

<pre>
| GPIO       | Voltage Level | Tolerance |
| ---------- | ------------- | --------- |
| GPIO3_C0   | 3.3V          | 3.63V     |
| ADC_IN5    | 1.8V          | 1.98V     |
</pre>

=== GPIO number ===

Rockchip RK3568 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 4.19 kernel, the GPIO number can be calculated as below, take GPIO4_D1 (PIN26 on 4-0PIN HEADER) as an example:

 GPIO4_D1 = 4*32 + 3*8 + 1 = 153
 (A=0, B=1, C=2, D=3)

To set GPIO4_D1 output

 cd /sys/class/gpio
 echo 153 > export
 cd gpio153
 echo out > direction
 echo 1 > value     # output high
 echo 0 > value     # output low