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Rock3/CM3/raspcm4io/gpio

< Rock3‎ | CM3‎ | raspcm4io
Revision as of 12:55, 12 February 2022 by Stephen (Talk | contribs)

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    ROCK 3 >  Compute Module 3 >   Raspberry Pi CM4 IO Board >   GPIO

General purpose input-output (GPIO) connector

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

GPIO number Function4 Function3 Function2 Function1 Pin# Pin# Function1 Function2 Function3 Function4 GPIO number
+3.3V 1 2 +5.0V
14 SPI0_MOSI_M0 I2C2_SDA_M0 PWM2_M1 GPIO0_B6 3 4 +5.0V
13 SPI0_CLK_M0 I2C2_SCL_M0 PWM1_M1 GPIO0_B5 5 6 GND
125 I2S1_SDI3_M1 SDMMC2_PWREN_M0 GPIO3_D5 7 8 GPIO0_D1 UART2_TX_M0 25
GND 9 10 GPIO0_D0 UART2_RX_M0 24
23 UART0_CTSn PWM0_M1 GPIO0_C7 11 12 GPIO3_C7 I2S1_SCLK_TX_M1 119
15 PWM0_M0 GPIO0_B7 13 14 GND
19 PWM4 VOP_PWM_M0 GPIO0_C3 15 16 GPIO3_D4 I2S1_SDI2_M1 124
+3.3V 17 18 GPIO3_D3 I2S1_SDI1_M1 123
138 I2S2_SDI_M1 SPI3_MOSI_M0 I2C4_SDA_M0 GPIO4_B2 19 20 GND
136 SPI3_MISO_M0 I2S1_SDO1_M1 GPIO4_B0 21 22 GPIO3_C6 I2S1_MCLK_M1 118
139 I2S2_SDO_M1 SPI3_CLK_M0 I2C4_SCL_M0 GPIO4_B3 23 24 GPIO4_A6 I2S1_SCLK_RX_M1 SPI3_CS0_M0 134
GND 25 26 SARADC_IN3
140 I2C2_SDA_M1 GPIO4_B4 27 28 GPIO4_B5 I2S1_SDO3_M1 I2C2_SCL_M1 141
137 I2S1_SDO2_M1 ISP_PRELIGHT_TRIG GPIO4_B1 29 30 GND
21 SPI0_MISO_M0 PWM6 GPIO0_C5 31 32 GPIO4_C0 PWM11_IR_M1 144
22 SPI0_CS0_M0 PWM7_IR GPIO0_C6 33 34 GND
120 I2S1_LRCK_TX_M1 GPIO3_D0 35 36 GPIO4_A7 I2S1_LRCK_RX_M1 SPI3_CS1_M0 135
18 PWM3_IR GPIO0_C2 37 38 GPIO3_D2 I2S1_SDI0_M1 122
GND 39 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.

| GPIO       | Voltage Level | Tolerance |
| ---------- | ------------- | --------- |
| SARADC_IN3    | 1.8V          | 1.98V     |

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