Duo

Milk-V Duo is an ultra-compact embedded development platform based on the CV1800B chip. It can run Linux and RTOS, providing a reliable, low-cost, and high-performance platform for professionals, industrial ODMs, AIoT enthusiasts, DIY hobbyists, and creators.

Introduction of CV1800B

CV1800B is a high-performance, low-power chip for residential consumer surveillance IP cameras, home intelligence and many other products, integrated with H.264/H.265 video compression encoder and ISP; supports digital broad dynamic, 3D noise reduction, defogging, lens distortion correction and other image enhancement and correction algorithms, providing customers with professional-grade video image quality.

The chip integrates self-developed intelligent reference solutions (human detection, area detection, motion detection), built-in DDR and complete peripherals and peripherals, providing a highly integrated and simple solution to support customer product development and mass production.

In addition, it also provides secure boot, secure update, secure encryption, etc., providing users with a series of security solutions from development, mass production, and product application with an 8-bit MCU subsystem integrated into the chip, which can replace the general external MCU to achieve the purpose of saving BOM cost and power consumption.

CV1800B Public Preliminary Datasheet

We have open sourced the Public Preliminary Datasheet of CV1800B to GitHub. please check it out.

Buy the CV1800B Chips

Milk-V is the Authorised Global Distributor of the CV1800B chips. You can buy samples of the CV1800B chip from our distributor online store directly. For volume order, please contact Milk-V Sales Team for the qoutation.

Getting Started

Installing the system

Please refer to the Start Up section.

USB Network Usage

Please refer to the Setup section.

Duo GPIO Pinout

GPIO pin mapping

GROUP	ADDR	PORT	CHIP	NUM	NAME	START
gpio0	gpio@03020000	porta	gpiochip0	480-511	XGPIOA	480 - XGPIOA[0]
gpio1	gpio@03021000	portb	gpiochip1	448-479	XGPIOB	448 - XGPIOB[0]
gpio2	gpio@03022000	portc	gpiochip2	416-447	XGPIOC	416 - XGPIOC[0]
gpio3	gpio@03023000	portd	gpiochip3	384-415
gpio4	gpio@05021000	porte	gpiochip4	352-383	PWR_GPIO	352 - PWR_GPIO[0]

GPIO Pinout

JTAG	SPI	SPI NOR	SD	PWM	I2C	UART	NUM	CV1800B	NAME	PIN	PIN	NAME	CV1800B	NUM	ADC	SPI NOR	SPI NAND
JTAG_TDI					I2C0_SCL	UART1/2_TX	508	XGPIOA[28]	GP0	1	40	VBUS(5V)
JTAG_TDO					I2C0_SDA	UART1/2_RX	509	XGPIOA[29]	GP1	2	39	VSYS(5V)
									GND	3	38	GND
			SD1_GP1	PWM10		UART4_TX	378	PWR_GPIO[26]	GP2	4	37	3V3_EN
			SD1_GP0	PWM11		UART4_RX	377	PWR_GPIO[25]	GP3	5	36	3V3(OUT)
		SPINOR1_HOLD_X	SD1_D2	PWM5	I2C1_SCL	UART2/3_TX	371	PWR_GPIO[19]	GP4	6	35
		SPINOR1_WP_X	SD1_D1	PWM6	I2C1_SDA	UART2/3_RX	372	PWR_GPIO[20]	GP5	7	34
									GND	8	33	GND
	SPI2_SCK	SPINOR1_SCK	SD1_CLK	PWM9	I2C3_SDA		375	PWR_GPIO[23]	GP6	9	32	GP27	XGPIOB[6]	454	ADC2(1.8V)
	SPI2_SDO	SPINOR1_MOSI	SD1_CMD	PWM8	I2C3_SCL		374	PWR_GPIO[22]	GP7	10	31	GP26	XGPIOB[3]	451	ADC1(1.8V)
	SPI2_SDI	SPINOR1_MISO	SD1_D0	PMW7	I2C1_SDA	UART3_RTS	373	PWR_GPIO[21]	GP8	11	30	RUN
	SPI2_CS_X	SPINOR1_CS_X	SD1_D3	PWM4	I2C1_SCL	UART3_CTS	370	PWR_GPIO[18]	GP9	12	29	GP22	PWR_GPIO[4]	356
									GND	13	28	GND
					I2C1_SDA		425	XGPIOC[9]	GP10	14	27	GP21	XGPIOA[26]	506		SPINOR_HOLD_X	SPINAND_HOLD
					I2C1_SCL		426	XGPIOC[10]	GP11	15	26	GP20	XGPIOA[27]	507		SPINOR_WP_X	SPINAND_WP
JTAG_TMS				PWM4		UART0/1_TX	496	XGPIOA[16]	GP12	16	25	GP19	XGPIOA[25]	505		SPINOR_MOSI	SPINAND_MOSI
JTAG_TCK				PWM5		UART0/1_RX	497	XGPIOA[17]	GP13	17	24	GP18	XGPIOA[22]	502		SPINOR_SCK	SPINAND_SCK
									GND	18	23	GND
							494	XGPIOA[14]	GP14	19	22	GP17	XGPIOA[24]	504		SPINOR_CS_X	SPINAND_CS
							495	XGPIOA[15]	GP15	20	21	GP16	XGPIOA[23]	503		SPINOR_MISO	SPINAND_MISO

							440	XGPIOC[24]		LED

Camera interface

Duo camera uses a 16-pin connector with a distance of 0.5 mm, which can be directly used with the CAM-GC2083 camera head.

Connector FPC Definition

J1	Description
1	GND
2	MIPI0_DN0
3	MIPI0_DP0
4	GND
5	MIPI0_DN1
6	MIPI0_DP1
7	GND
8	MIPI0_CKN
9	MIPI0_CKP
10	GND
11	SENSOR_RSTN (1.8V)
12	SENSOR_CLK (1.8V)
13	I2C1_SCL (1.8V)
14	I2C1_SDA (1.8V)
15
16	3V3

Duo User Guide

UART Serial Console

Duo has a reserved UART debug serial port, which can be used to view the system startup log, or to log in to the console after the system starts and execute some terminal commands.

USB-TTL Serial Cable

The serial port level of Duo series is 3.3V.

The pin definitions of common USB to TTL serial cables are as follows:

Connection

Connect the USB to TTL serial cable as shown below, leaving the red wire unconnected.

Milk-V Duo	<--->	USB to TTL
TX (pin 16)	<--->	White wire
RX (pin 17)	<--->	Green wire
GND (pin 18)	<--->	Black wire

The default serial port parameters of Duo are as follows:

baudrate: 115200
data bit: 8
stop bit: 1
parity  : none
flow control: none

Hardware Docs

Duo

Introduction of CV1800B​

CV1800B Public Preliminary Datasheet​

Buy the CV1800B Chips​

Getting Started​

Installing the system​

USB Network Usage​

Duo GPIO Pinout​

GPIO pin mapping​

GPIO Pinout​

Camera interface​

Connector FPC Definition​

Duo User Guide​

UART Serial Console​

USB-TTL Serial Cable​

Connection​

Hardware Docs​

V1.2​

V1.1​

Others​

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