EWS_privat/firmware/canfd_cdc_composite/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