Lichee RV - Nezha CM

Edit on 2022.05.13

Overview

Lichee RV - Nezha CM is a compute module with modular design, equipped with Allwinner D1 chip (based on T-Head XuanTie C906 core), 512MB DDR3 RAM. It can boot from TF card or SD-NAND, uses two sets of M.2 b key 67 pin connectors to route all IO, making it convient for wide use and easy to replace.

Specifications

Item Value
CPU Allwinner D1 chip (Based on T-Head XuanTie C906 core) up to 1GHZ
RAM 16bits 512MB DDR3,Up to 792MHz
Storge Onboard TF card slot,can use tf card for storing,1TB storage capacity have been tested ok
Reserve SD-NAND pads (Conflict with 8pins lcd interface. using for business custom made )
Display MIPI:4-lane MIPI DSI
RGB:RGB888 interface(partially multiplexed with DSI)
MCU : I80 interface
SPI:Onboard 8pins SPI screen interface,can be used for 1.14 inch screen
Audio Analog audio headphone output(HPOUT);
Analog audio line input(LINEIN);
Digital Audio (I2S/SPDIF);
Analog microphone interface(MIC3);
Digital microphone interface(DMIC);
All above pin out to connecting finger
Ethernet Pin out RMII/RGMII to connecting finger (Multiplexed with some GPIOs)
USB Onboard TYPE-C USB-OTG interface(USB0)
USB-HOST pins out to connecting finger(USB1)
GPIO Other GPIOs all pin out to connecting finger
Key • FEL key (Enter to download mode)
Led • A power led
• A user led (active high)
PCB 4 layers
Fixed
way
Connect the core board and bottom board by two sets of M.2B connecting finger and fasten with a M2 screw
Development lanuguge C/C++, Python, Golang, etc...
System Mirrors Tina Linux (Based on OpenWRT 14.07), Debian, YoC (RTOS )

Comparison between the bottom board

Item Lichee RV Dock Lichee RV Panel
SOC Allwinner D1(XuanTie C906 RISC-V) Allwinner D1(XuanTie C906 RISC-V)
Ram 1GByte 1GByte
Wireless network Choosable:
-2.4G WIFI+BT
- none (You can weld other WiFi modules but need debug by yourself)
2.4G WIFI+BT
Wired network None Support 100M Ethernet
Video out HDMI connector;
SPI screen interface;
Screen convert board can be used for:
- common RGB screen connector(include TP pins)(support 4.3inch/5.0inch screen we sell
- MIPI screen interface connector(compatible with 8-inch screen of NeZha development board)
sRGB screen interface connector(include TP pins)(support standard 4 inch ips screen with TP )
MIPI screen interface connector(compatible with 8-inch screen of NeZha development board)
USB port One USB OTG(Type-C port on core board)
One USB Host(USB-A port on bottom board)
One USB OTG(Type-C port on core board)
One USB Host(USB-C port on bottom board)
Expand interface Support microphone arrays
Most GPIOs are connected with 2x20P pin pads
Part GPIOs are connected to 2x20P pin pads出
Audio Onboard 3W Audio amplifier
Onboard electret microphone circuit
Onboard 3W Audio amplifier
Onboard 2 MEMS digital microphones
Key One FEL key(Enter to download mode)
One RST key(Reset)
One user key
One FEL key(Enter to download mode)
LED One power led
One 2812 RGB LED
One power led
Shell None 3D print shell
Size 65.0mm x 40.0mm 86.0mm x 86.0mm

Connect 1.14 inch screen

Up to now 1.14 inch screen is not able to display and need to wait for updating

Burn system

Flash tutorial

Notice

The USB TYPE-C connector of the core board uses the CC pin as an automatic OTG identification pin, so it conflicts with the identification when using the USB C to C data line, and it only works with the USB A to C data line. There are two ways to solve this problem and the steps are as follows

Type-C work mode OTG (Factory default product) CC identification(Need to change hardware)
Resistance R30 and resistance R31 Blank weld 5.1K 1% 0402 resistance
Diode D3 and D4 weld 4148 diode Blank
Compatible with C to C cables no yes
Compatible with A to C cables yes yes
Whether supports automatic OTG switching yes no

To use C to C data line, a physical modification to the device is required to be made around the type-c connector in order to use the corresponding CC identification mode. A manual switch to Host mode using OTG cables will be required from then on should you wish to attach the external USB devices, as automatic OTG switching is disabled.

If you want to use USB C to C data line, you need do two things:

① add two 5.1K 1% 0402 Resistances at R30 and R31 ,② Remove Diode

Download

Please download the Debian system image from Mega netdisk:

https://mega.nz/folder/lx4CyZBA#PiFhY7oSVQ3gp2ZZ_AnwYA

If you want to build your own custom image, you can visit the BSP SDK in the following link.

BSP SDK