Rock3/CM3/raspcm4io

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

Resource

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_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