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EWS/firmware/canfd_cdc_composite
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Eduard Iten ed6023141a Complete candleLight-compatible gs_usb implementation 
- Added full candleLight VID/PID (0x1D50:0x606F) compatibility
- Implemented complete gs_usb protocol structures
- Enhanced bidirectional CAN-USB frame conversion
- Added vendor request handling for device configuration
- Integrated with Zephyr legacy USB device stack
- Support for CAN-FD frames with proper flag handling
- Echo frame functionality for gs_usb compliance
 		2025-12-08 16:26:02 +01:00
..
boards/arm/ews fix: eliminate deprecated USB API warnings 2025-12-08 14:36:16 +01:00
build Complete candleLight-compatible gs_usb implementation 2025-12-08 16:26:02 +01:00
src Complete candleLight-compatible gs_usb implementation 2025-12-08 16:26:02 +01:00
CMakeLists.txt feat: working basic firmware with legacy USB API 2025-12-08 14:06:01 +01:00
README.md Rename board from ews_board to ews and fix board discovery 2025-12-08 11:32:22 +01:00
prj.conf fix: eliminate deprecated USB API warnings 2025-12-08 14:36:16 +01:00

README.md

CAN FD CDC Composite Firmware

A Zephyr-based firmware for the EWS board that provides:

  • CAN FD to gs_usb interface (similar to candlelight)
  • USB CDC interface for PFET control
  • USB composite device functionality

Features

  • CAN FD Support: Full CAN FD protocol support via gs_usb interface
  • USB Composite: Single USB device with multiple interfaces:
    • gs_usb interface for CAN communication
    • CDC ACM interface for PFET control and status
  • PFET Control: Control both output PFETs via CDC commands
  • Status LEDs: Control status LEDs for visual feedback
  • Compatible: Works with standard CAN utilities (can-utils, etc.)

Hardware Target

  • MCU: STM32G0B1KBU6 (on EWS board)
  • CAN: CAN FD via FDCAN1 (PB0/PB1) with SN65HVD230 transceiver
  • USB: USB 2.0 Full Speed (PA11/PA12)
  • GPIOs:
    • PFET1 control: PA8
    • PFET2 control: PB2
    • Status LED: PB4

Build Requirements

  • Zephyr RTOS (v3.5+)
  • West build tool
  • ARM GCC toolchain

Building

west build -b ews

CDC Protocol

The CDC interface uses simple text commands:

  • PFET1_ON\n - Turn on PFET1
  • PFET1_OFF\n - Turn off PFET1
  • PFET2_ON\n - Turn on PFET2
  • PFET2_OFF\n - Turn off PFET2
  • STATUS\n - Get current PFET status