CANBED DUAL

Introduction¶

CANBed Dual is a CAN Bus development board with 2 independent CAN FD interface based on RP2040. RP2040 has 2MB of Flash and 264KB of RAM. The operating frequency is up to 133MHz, which is suitable for most embedded applications.

CANBed Dual uses the GD32E103CBT6 as the CAN controller. There is a Micro USB connector on the board, through which you can program the board or supply power to the board. There are one I2C, one UART, one SPI interface, 3 analog input interfaces and 8 digital IO on the board.

There's a 6PIN Terminal for connecting CAN Bus interface. The voltage input range of the CAN interface is 4.5-28V, which can provide a stable 5V/1A output.

Note

For transportation considerations, the plug-in components of the kit are not soldered by default. After you receive the kit, you need to do some soldering work. If necessary, you can also contact info@longan-labs.cc after purchasing the board, then we can send it to you after the board is soldered well.

Application Ideas¶

With CANBed Dual, you can，

To learn CAN Bus communication
To build product prototypes. After you complete the product prototype, we can help you integrate it into a product and assist you in production
To read the data from the car
As a part of your product, you don't need to design the MCU and CAN Bus separately, only need to complete other hardware design

CANBed Family¶

Currently we have 6 CANBeds, you can choose the right one according to your needs.

VRESION	CANBed V1	CANBed FD	CANBed M0	CANBed M4	CANBed RP2040	CANBed Dual
MCU	Atmega32U4	Atmega32U4	ATSAMD21G18	ATSAME51G19A	RP2040	RP2040
CORE	AVR 8 bit	AVR 8 bit	ARM Cortex M0+ 32bit	ARM Cortex M4 32bit	Dual ARM Cortex-M0+	Dual ARM Cortex-M0+
PROTOCOL	CAN2.0	CANFD & CAN2.0	CAN2.0	CANFD & CAN2.0	CAN2.0	CANFD & CAN2.0
CLOCK	16MHz	16MHz	48MHz	133MHz	133MHz	133MHz
FLASH	32KB	32KB	256KB	2MKB	2MKB	2MKB
RAM	2.5KB	2.5KB	32KB	192KB	264KB	264KB
PRICE	$24.9	$29.9	EoL	$49.9	$15.9	$24.9
LINK	GET ONE	GET ONE	GET ONE	GET ONE	GET ONE	GET ONE

Note

The above price may not be the latest price, please refer to the price on the product page.

CAN BUS PRODUCTS LIST OF LONGAN LABS¶

We have made a lot of can bus products, you can get more information through the following list, so as to choose a product suitable for you.

PRODUCT NAME	LINK	PRICE	MCU	CHIP	PROTOCOL
Serial CAN Bus Module	LINK	$19.9	ATMEGA168PA	MCP2515	CAN2.0
I2C CAN Bus Module	LINK	$19.9	ATMEGA168PA	MCP2515	CAN2.0
OBD-II Serial CAN Bus Dev Kit	LINK	$20.9	ATMEGA168PA	MCP2515	CAN2.0
OBD-II CAN Bus GPS Dev Kit	LINK	$29.9	ATMEGA32U4	MCP2515	CAN2.0
OBD-II CAN Bus Basic Dev Kit	LINK	$24.9	ATMEGA32U4	MCP2515	CAN2.0
CAN-FD Shield	LINK	$19.9	NO MCU	MCP2517FD	CAN-FD
CAN Bus Shield	LINK	$9.9	NO MCU	MCP2515	CAN2.0
CANBed	LINK	$24.9	ATMEGA32U4	MCP2515	CAN2.0
CANBed-FD	LINK	$29.9	ATMEGA32U4	MCP2517FD	CAN-FD
CANBed M4	LINK	$49.9	ATSAME51	-	CAN-FD
OBD-II RF Dev Kit	LINK	$19.9	ATmega168PA	MCP2515	CAN2.0

Note

The above price may not be the latest price, please refer to the price on the product page.

Features¶

Powerful RP2040 processor
2 Independent CAN FD interface
Up to 5Mb/s CAN FD baudrate
2x3 Pin SPI Interface
2x9 Pin IOs pinout
Power input from 4.5-28V

Specifications¶

Parameter	Value
MCU	RP2040
Clock Speed	flexible clock running up to 133 MHz
Flash Memory	2MB
RAM	264KB
Operate Voltage	4.5-28V
Output Current @ 3.3V	1A
Input Interface	sub-D

Hardware Overview¶

Part List¶

Note

For transportation considerations, the plug-in components of the kit are not soldered by default. After you receive the kit, you need to do some soldering work. If necessary, you can also contact info@longan-labs.cc after purchasing the board, then we can send it to you after the board is soldered well.

CANBed Dual PCBA x 1
6 Pin Terminal connector x 1
6 Pin Switch x 2
9x2 2.54 Header x 1
3x2 2.54 Header x 1

Pin out¶

Note

Click to get larger image.

1. GPIO - 9x2 I/O Pin OUT:

The I/Os of RP2040 list out here, which is consist of,

1 x UART
1 x I2C
4 x Analog Input(can be used us Digital IO)
7 x Digital I/O

2. Micro USB connector for programming

3. SPI Interface

4. CAN1 RX/TX Indicator

LED blinks when there's data communication.

5. CAN1 120Ω Switch

If you use this board on the end of the CAN bus, please put this switch to 120Ω. For more detail about the CAN bus protocol, please refer to the NI CAN Physical Layer and Termination Guide

6. 6Pin Terminal for CAN Interface

7. BOOT

8. RST

Click to reset the board.

Getting Started with Arduino IDE¶

Here we use the Arduino IDE as a demonstration, through this chapter you can learn how to get started with CANBed Dual. You need a micro USB cable to connect the CANBed Dual to the computer.

In this demo, CAN FD will send a frame to CAN 2.0 every 100ms.

Arduino IDE Steup¶

First download the Arduino IDE from https://www.arduino.cc/en/Main/Software. Arduino IDE can be installed and run on Windows, Linux, and Mac OS X operating systems. Download the installer or zip file (Windows only) and install (if you have the zip file, extract it to your Windows computer’s hard drive) it on your operating system.

Once finished, start the Arduino IDE.

Copy and paste the link below into the Additional Boards Manager URLs option in the Arduino IDE preferences (File > Preferences).

https://raw.githubusercontent.com/Longan-Labs/Longan-RP2040/main/package_rp2040_index.json

Once done, click OK button to save the new preference settings.

Now open the Boards Manager by navigating to the Tools -> Board menu.

Select All from the Type drop-down menu. Then type longan in the top search bar. While typing, you will see the Longan RP2040 Boards package.

Click on the Longan RP2040 Boards by Longan Labs and then click on Install button.

Once installed, close the Boards Manager window.

Download the install the library¶

Get the Arduino library for CANBed Dual

Open the Arduino IDE, navigate to Sketch > Include Library > Add .ZIP Library to install the Library.

Hardware Connection¶

Please conect CAN0H to CAN1H, CAN0L to CAN1L.

Open the code and upload it to the board¶

Open the Arduino IDE, here we open the CAN20_SendRecv example. This example can continuously send data to the CAN Bus.

// CANBED DUAL TEST EXAMPLE
// CAN 0 Send, CAN 1 Recv

#include <Wire.h>
#include <stdio.h>
#include "canbed_dual.h"

CANBedDual CAN0(0);
CANBedDual CAN1(1);


void setup()
{
    Serial.begin(115200);
    pinMode(18, OUTPUT);

    Wire1.setSDA(6);
    Wire1.setSCL(7);
    Wire1.begin();

    CAN0.init(500000);          // CAN0 baudrate: 500kb/s
    CAN1.init(500000);          // CAN1 baudrate: 500kb/s
}

void loop()
{
    sendData();

    unsigned long id = 0;
    int ext = 0;
    int rtr = 0;
    int fd = 0;
    int len = 0;

    unsigned char dtaGet[100];

    if(CAN1.read(&id, &ext, &rtr, &fd, &len, dtaGet))
    {
        Serial.println("CAN1 GET DATA");
        Serial.print("id = ");
        Serial.println(id);
        Serial.print("ext = ");
        Serial.println(ext);
        Serial.print("rtr = ");
        Serial.println(rtr);
        Serial.print("fd = ");
        Serial.println(fd);
        Serial.print("len = ");
        Serial.println(len);

        for(int i=0; i<len; i++)
        {
            Serial.print(dtaGet[i]);
            Serial.print("\t");
        }
        Serial.println();
    }
}

void sendData()
{
    static unsigned int cnt = 0;
    cnt++;
    if(cnt > 99)cnt = 0;
    unsigned char str[8];
    for(int i=0; i<8; i++)str[i] = cnt;
    CAN0.send(0x01, 0, 0, 0, 8, str);
}

// ENDIF

You need to select CANBed Dual on the Arduino IDE boards and select the correct COM port. Then you can upload the program to the CANBed Dual Dev board by pressing the Upolading button on Arduino IDE.

After the uploading is done, open the Serial monitor, you will see data printed to the monitor.

Arduino Code¶

We provide an Arduino libraries for CANBed Dual

CAN20_SendRecv - Send and Recv a frame under CAN2.0
CANFD_SendRecv - Send and Recv a frame under CANFD
MaskandFilt - Receive a frame from CAN Bus with mask and filter setting

How to Use¶

As the CANBed Dual uses the same chip as the Raspberry Pi Pico (RP2040), please to to Getting Started with Pico for details.

FAQ¶

I can't upload code to CANBed Dual

When the board is connected to the computer via the Micro USB cable, a new COM device will appear on the computer. If the new device does not appear on your computer, you can try a different USB cable or try another computer.

The RX/TX led light up and never turn off

Check if the baudrate of CAN Bus is setting correct
Try turning on/off the switch for the 120Ω terminal resistor
Check if CANH and CANL is well connected, H to H and L to L

How to find the tech support

Please contact support@longan-labs.cc for technical support. Our technical support engineer will usually reply you within 24 hours on working days. In order to get faster support, we hope that when you send us an email, you need to include at least the following content,

When and how to buy the product
Product version information
Take a high-definition picture of the product you use, including the connection
Describe in detail the problem you encountered and what kind of help you would like to get

CANBED DUAL

Introduction¶

Application Ideas¶

CANBed Family¶

CAN BUS PRODUCTS LIST OF LONGAN LABS¶

Features¶

Specifications¶

Hardware Overview¶

Part List¶

Pin out¶

Getting Started with Arduino IDE¶

Arduino IDE Steup¶

Download the install the library¶

Hardware Connection¶

Open the code and upload it to the board¶

Arduino Code¶

How to Use¶

FAQ¶

Schematic Online Viewer¶

Reference¶