Rock3/CM3/raspcm4io
ROCK 3 > Compute Module 3 > Raspberry Pi CM4 IO Board
Contents
Status
Features
Getting Started
What you need
Necessary
- Radxa CM3
- Raspberry Pi CM4 IO 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.
- USB Male A to Micro USB cable
- If you want write image on CM4 IO from USB port, 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
Hardware Documentation
Radxa CM3 RPI 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
System images and usage
Get your favorite system images from Radxa CM3 RPI CM4 IO Downloads.
And check the features of Ubuntu or Debian.
Flash images
Radxa CM3 RPI CM4 IO board supports two boot methods including booting from eMMC and booting from MicroSD. Select one of the following methods.
Troubleshooting
Check ROCK 3 FAQs first, if it doesn't help, start a new post on the forum https://forum.radxa.com/c/rock3.