DM-USBCU1 USB-CAN converter module

Original user manual（Chinese）

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USB-CAN converter software

Please refer to the USB-CAN converter software here.

Specifications

Size	4x2x1cm
Model	DM-USBCU1
Type	CAN bus
Brand	Damiao
Production	China
Use case	USB-UART conversion USB-CAN conversion CAN analyzing
Description	Module【V3.0】 + UART-3P cable + CAN-2P cable CAN isolation upgraded

Conversion of USB to CAN frame（V2.0）

CAN frame data format

CAN frame data format
Frame header		Frame length	Command	Number of transmission				Time period				ID type	CAN ID				Frame type	idAcc	dataAcc	len	data[len]	CRC
Data0	Data1	Data2	Data3	Data4	Data5	Data6	Data7	Data8	Data9	Data10	Data11	Data12	Data13	Data14	Data15	Data16	Data17	Data18	Data19	Data20	Data21~Data28	Data29
16bit		8bit	8bit	32bit				16bit				8bit	32bit				8bit			8bit	8bit * 8	8bit
55	AA	1e	01	01	00	00	00	0a	00	00	00	00	00	00	00	00	00	00	00	08	data[8]	crc

• Command
  • 0x01 CAN data frame transmit
  • 0x02 Handshake PC and device, device returns OK
  • 0x03 Non-feedback CAN forwarding, no feedback on transmission status
• ID type
  • 00 Standard frame
  • 01 Extended frame
• Frame type
  • 00 Data frame
  • 01 Remote frame

Note: Other formats are serial transmission data

e.g.

55 aa 1e 01 01 00 00 00 0a 00 00 00 00 00 00 00 00 00 08 00 00 12 23 34 45 56 67 78 89 88

Baud rate setup command for serial port

Baud rate setting command for serial port
Frame header		baudrate				databit	stopbit	parity	Frame footer
Data0	Data1	Data2	Data3	Data4	Data5	Data6	Data7	Data8	Data9	Data10
16bit		32bit				8bit	8bit	8bit	16bit
0x55	0xAA								0xAA	0x55

typedef struct {
  uint32_t baudrate; // Baud rate
  uint8_t databit; // Data bit
  uint8_t stopbit; // Stop bit
  uint8_t parity; // Parity
} Baudrate_set_data;

// Data length setting
// 0: 8bit
// 1: 9bit
switch(setdata_t->databit)
{
case 0u:
  stcInitCfg.enDataLength = UsartDataBits8;
  break;
case 1u:
  stcInitCfg.enDataLength = UsartDataBits9;
  break;
default:
  stcInitCfg.enDataLength = UsartDataBits8;
  break;
}

// Parity setting
switch(setdata_t->parity)
{
case 0u:
  stcInitCfg.enParity = UsartParityNone;
  break;
case 1u:
  stcInitCfg.enParity = UsartParityEven;
  break;
case 2u:
  stcInitCfg.enParity = UsartParityOdd;
  break;
default:
  stcInitCfg.enParity = UsartParityNone;
  break;
}

// Stop bit setting
switch(setdata_t->stopbit)
{
case 0u:
  stcInitCfg.enStopBit = UsartOneStopBit;
  break;
case 1u:
  stcInitCfg.enStopBit = UsartTwoStopBit;
  break;
default:
  stcInitCfg.enStopBit = UsartTwoStopBit;
  break;
}

CAN baudrate setting command

CAN baudrate setting command
Frame header		Index	Frame footer
Data0	Data1	Data2	Data3	Data4
16bit		8bit
0x55	0x05		0xAA	0x55

Index	Baud rate	Ideal CIA	Real CIA
index0	1000kbps	75%	75%
index1	800kbps	80%	80%
index2	666kbps	80%	83.3%
index3	500kbps	87.5%	87.5%
index4	400kbps	87.5%	85%
index5	250kbps	87.5%	87.5%
index6	200kbps	87.5%	85%
index7	125kbps	87.5%	87.5%
index8	100kbps	87.5%	87.5%
index9	80kbps	87.5%	86.5%
index10	50kbps	87.5%	87.5%
index11	40kbps	87.5%	85%
index12	20kbps	87.5%	85%
index13	10kbps	87.5%	85%
index14	5kbps	87.5%	87.5%

Heart beat communication between PC and device

Heart beat communication between PC and device
Frame header		Frame footer
Data0	Data1	Data3	Data4
16bit
0x55	0x04	0xAA	0x55

Note: IF CMD is 00 in CAN data, other CAN data are invalid.

CAN transmission terminate（when transmitting periodically）

CAN transmission terminate（when transmitting periodically）
Frame header		Frame footer
Data0	Data1	Data3	Data4
16bit
0x55	0x03	0xAA	0x55

Note: This will terminate current transmission

CAN receive data frame format

CAN frame data format
Frame header	Command	Format	CAN ID				Data								Frame footer
Data0	Data1	Data2	Data3	Data4	Data5	Data6	Data7	Data8	Data9	Data10	Data11	Data12	Data13	Data14	Data15
AA															55

CAN command:

• 00 Heartbeat
• 0x01 Receive failed
• 0x11 Receive succeeded
• 0x02 Transmit failed
• 0x12 transmit succeeded
• 0x03 Baud rate setting failed
• 0x13 Baud rate setting succeeded

Format: It includes data length and data frame type.

See the structure below for details.

// CAN return data format
typedef struct // CAN send function related structures 16 bytes
{
  uint8_t frameHeader;  // Send flag 0xAA
  uint8_t CMD;          // CAN command
  uint8_t canDataLen:6; // Data length
  uint8_t canIde:1;     // ide: 0 Standard、1 Extended
  uint8_t canRtr:1;     // rtr: 0 Data frame、1 Remote frame
  uint32_t CANID;       // CAN ID
  uint8_t canData[8];   // CAN data
  uint8_t freamEnd;     // End 0x55
} CAN_Fream;

e.g.

AA 11 08 00 00 00 00 00 01 02 03 04 05 06 07 55