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EWS_privat/firmware/canfd_cdc_composite
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Eduard Iten b11c9958e8 Complete GS_USB implementation with simplified USB integration 
- Implemented complete gs_usb protocol structures and constants
- Added basic USB vendor request handling for gs_usb commands
- Created CAN-FD to gs_usb frame conversion functions
- Fixed deprecated USB API warnings and compilation issues
- Successfully building firmware with 42.6KB flash usage (8.13%)
- Basic framework ready for full gs_usb protocol implementation

Key components:
- gs_usb_can.c/h: CAN interface and protocol structures
- usb_gs_usb_class.c/h: USB class implementation with vendor requests
- All gs_usb protocol constants (BREQ_*, mode flags, feature flags)
- Frame conversion between Zephyr CAN and gs_usb format
- Placeholder for future USB bulk endpoint implementation
 		2025-12-08 15:18:54 +01:00
..
boards/arm/ews fix: eliminate deprecated USB API warnings 2025-12-08 14:36:16 +01:00
build Complete GS_USB implementation with simplified USB integration 2025-12-08 15:18:54 +01:00
src Complete GS_USB implementation with simplified USB integration 2025-12-08 15:18:54 +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