Rock3/CM3/raspcm4io

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

Getting Started

What you need

Necessary

• CM4 IO main board
• CM4 IO top board

• One of the Storage media below:
  • microSD, larger than 8GB.

• Power supply
  • The CM4 is powered by DC port and has a wide range of input voltage, 12V.

• USB Keyboard and Mouse
  • With four USB-A connectors, CM4 IO can be equipped with a full sized keyboard and mouse.

• Monitor and HDMI Cable
  • CM4 IO is equipped with a full sized HDMI connector. HDMI capable monitor is recommended.
  • HDMI EDID display data is used to determine the best display resolution. On monitors and TVs that support 1080p (or 4K) this resolution will be selected. If 1080p is not supported the next available resolution reported by EDID will be used. This selected mode will work with MOST but not all monitors/TVs.

• Micro USB
  • If you want write image on CM4 IO from USB port , commands you need an USB Male A to Micro USB cable to connect CM4 IO and PC.

Optional

• microSD Card Reader
  • For flashing the image into microSD Card

• USB type A to type Micro USB
  • Write image on CM4 IO from USB port

• USB to TTL serial cable
  • This is needed for serial console.

• Ethernet cable
  • CM4 IO supports Internet access via WIFI or Ethernet.
  • An Ethernet cable is used to connect your CM4 IO to a local network and the Interne

• Audio cable
  • Audio can be played through speaker or headphones using a standard 3.5mm jack.

• WiFi/BT Cards

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