View source for Rock3/CM3/raspcm4io/gpio

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{{Languages|rock3/cm3/raspcm4io/gpio}}

    [[rock3 | ROCK 3]] > [[rock3/CM3 | Compute Module 3]] >  [[Rock3/CM3/raspcm4io | Raspberry Pi CM4 IO Board]] >  [[Rock3/CM3/raspcm4io/gpio | GPIO]]

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

CM4 IO has a 40-pin expansion header. Each pin is distinguished by color.

{| 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
| 
| 
| 
| 
|-
| 14
| SPI0_MOSI_M0
| I2C2_SDA_M0
| PWM2_M1
| GPIO0_B6
| style="background-color:#008000; color:#FFF;" | 3
| 
| style="background-color:#F00;" | 4
| +5.0V
| 
| 
| 
| 
|-
| 13
| SPI0_CLK_M0
| I2C2_SCL_M0
| PWM1_M1
| GPIO0_B5
| style="background-color:#008000; color:#FFF;" | 5
| 
| style="background-color:#000; color:#FFF" | 6
| GND
| 
| 
| 
| 
|-
| 125
| 
| I2S1_SDI3_M1
| SDMMC2_PWREN_M0
| GPIO3_D5
| style="background-color:#008000; color:#FFF;" | 7
| 
| style="background-color:#008000; color:#FFF;" | 8
| GPIO0_D1
| style="background-color:#FFA500;" | UART2_TX_M0
| 
| 
| 25
|-
| 
| 
| 
| 
| GND
| style="background-color:#000; color:#FFF" | 9
| 
| style="background-color:#008000; color:#FFF;" | 10
| GPIO0_D0
| style="background-color:#FFA500;" | UART2_RX_M0
| 
| 
| 24
|-
| 23
| 
| UART0_CTSn
| PWM0_M1
| GPIO0_C7
| style="background-color:#008000; color:#FFF;" | 11
| 
| style="background-color:#008000; color:#FFF;" | 12
| GPIO3_C7
| I2S1_SCLK_TX_M1
| 
| 
| 119
|-
| 15
| 
| 
| PWM0_M0
| GPIO0_B7
| style="background-color:#008000; color:#FFF;" | 13
| 
| style="background-color:#000; color:#FFF" | 14
| GND
| 
| 
| 
| 
|-
| 19
| 
| PWM4
| VOP_PWM_M0
| GPIO0_C3
| style="background-color:#008000; color:#FFF;" | 15
| 
| style="background-color:#008000; color:#FFF;" | 16
| GPIO3_D4
| I2S1_SDI2_M1
| 
| 
| 124
|-
| 
| 
| 
| 
| +3.3V
| style="background-color:#FF0;" | 17
| 
| style="background-color:#008000; color:#FFF;" | 18
| GPIO3_D3
| I2S1_SDI1_M1
| 
| 
| 123
|-
| 138
| I2S2_SDI_M1
| SPI3_MOSI_M0
| I2C4_SDA_M0
| GPIO4_B2
| style="background-color:#008000; color:#FFF;" | 19
| 
| style="background-color:#000; color:#FFF" | 20
| GND
| 
| 
| 
| 
|-
| 136
| 
| SPI3_MISO_M0
| I2S1_SDO1_M1
| GPIO4_B0
| style="background-color:#008000; color:#FFF;" | 21
| 
| style="background-color:#008000; color:#FFF;" | 22
| GPIO3_C6
| I2S1_MCLK_M1
| 
| 
| 118
|-
| 139
| I2S2_SDO_M1
| SPI3_CLK_M0
| I2C4_SCL_M0
| GPIO4_B3
| style="background-color:#008000; color:#FFF;" | 23
| 
| style="background-color:#008000; color:#FFF;" | 24
| GPIO4_A6
| I2S1_SCLK_RX_M1
| SPI3_CS0_M0
| 
| 134
|-
| 
| 
| 
| 
| GND
| style="background-color:#000; color:#FFF" | 25
| 
| style="background-color:#008000; color:#FFF;" | 26
| SARADC_IN3
|
| 
| 
| 
|-
| 140
| 
| 
| I2C2_SDA_M1
| GPIO4_B4
| style="background-color:#00F; color:#FFF;" | 27
| 
| style="background-color:#00F; color:#FFF;" | 28
| GPIO4_B5
| I2S1_SDO3_M1
| I2C2_SCL_M1
| 
| 141
|-
| 137
| 
| I2S1_SDO2_M1
| ISP_PRELIGHT_TRIG
| GPIO4_B1
| style="background-color:#008000; color:#FFF;" | 29
| 
| style="background-color:#000; color:#FFF" | 30
| GND
| 
| 
| 
| 
|-
| 21
| 
| SPI0_MISO_M0
| PWM6
| GPIO0_C5
| style="background-color:#008000; color:#FFF;" | 31
| 
| style="background-color:#008000; color:#FFF;" | 32
| GPIO4_C0
| PWM11_IR_M1
| 
| 
| 144
|-
| 22
| 
| SPI0_CS0_M0
| PWM7_IR
| GPIO0_C6
| style="background-color:#008000; color:#FFF;" | 33
| 
| style="background-color:#000; color:#FFF" | 34
| GND
| 
| 
| 
| 
|-
| 120
| 
| 
| I2S1_LRCK_TX_M1
| GPIO3_D0
| style="background-color:#008000; color:#FFF;" | 35
| 
| style="background-color:#008000; color:#FFF;" | 36
| GPIO4_A7
| I2S1_LRCK_RX_M1
| SPI3_CS1_M0
| 
| 135
|-
| 18
| 
| 
| PWM3_IR
| GPIO0_C2
| style="background-color:#008000; color:#FFF;" | 37
| 
| style="background-color:#008000; color:#FFF;" | 38
| GPIO3_D2
| I2S1_SDI0_M1
| 
| 
| 122
|-
| 
| 
| 
| 
| GND
| style="background-color:#000; color:#FFF" | 39
| 
| style="background-color:#008000; color:#FFF;" | 40
| GPIO3_D1
| I2S1_SDO0_M1
| 
| 
| 121
|}

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

* Pins marked with color orange are designed for debug console.
* PWM:x7,PWM0/PWM1/PWM2/PWM3/PWM6/PWM7/PWM11
* SPI:X2,SPI0/SPI3
* I2C:X2,I2C2/I2C4
* UART:X2,UART0/UART2
* ADC:X1, SARADC_IN3
* I2S:X2, I2S1/I2S2

=== IO Voltage ===

RK3566 have three IO voltages, 1.8V/3.3V. For CM4 IO, the high level voltage of GPIO pin on 40-PIN HEADER is 3.3V.

<pre>
| GPIO       | Voltage Level | Tolerance |
| ---------- | ------------- | --------- |
| SARADC_IN3    | 1.8V          | 1.98V     |
</pre>

=== GPIO number ===

Rockchip RK3566 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

The GPIO number can be calculated as below, take GPIO4_C0 (PIN32 on 4-0PIN HEADER) as an example:

 GPIO4_C0 = 4*32 + 2*8 + 0 = 144
 (A=0, B=1, C=2, D=3)

To set GPIO4_C0 output

 cd /sys/class/gpio
 echo 144 > export
 cd 144
 echo out > direction
 echo 1 > value     # output high
 echo 0 > value     # output low