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QPCAN USB FD firmware for Blue Pill board

Target hardware: Blue Pill board

Pinout:

PIN/PINS	DESCRIPTION
PA11/PA12	USB FS DM/DP
PC13	Status LED

Works with PEAK PCAN-View in Windows

Before connecting the device to the USB port, the following must be done in the PCAN-View window:

1. All transmissions must be disabled.
2. PCAN-View program must be disconnected from PCAN hardware.

Otherwise for unknown reasons there is a failure in USB connection.
Inside pcan_protocol_process_data() function fields pmsg->size and pmsg->type are zero.

Toolchain: GNU Arm Embedded Toolchain

It is possible to build firmware with STM32CubeIDE project (I used version 1.12.1) or make.

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Limitations.

1. Clock Frequency must be 40 MHz.
2. Error Generator does not work.

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It is possible to use the CANHacker program with the QPCAN-USB FD device.

Certainly, in classic CAN mode only.

To do this, it is need to configure the settings in the Settings window of the CANHacker program.

CAN Device - PEAKUSB
CAN Baudrate - User Def. depending on the speed. The algorithm is below.

BTR0 - upper byte Baudrate Reg field
BTR1 - lower byte Baudrate Reg field

BRP = 10 * ( BTR0 & 0x3F ) + 9

tseg1 = ( BTR1 & 0xF )
tseg2 = ( BTR1 >> 4 ) & 0x07

SYSCLK = 80000000 (80 MHz)

BitRate = SYSCLK / ( 1 + BRP ) / ( 3 + tseg1 + tseg2 )

Examples.

1 MBit/s -> Baudrate Reg = 1
500 kBit/s -> Baudrate Reg = 14
250 kBit/s -> Baudrate Reg = 114
125 kBit/s -> Baudrate Reg = 314
100 kBit/s -> Baudrate Reg = 325

License

WTFPL