47 lines
1.2 KiB
Markdown
47 lines
1.2 KiB
Markdown
# CAN FD CDC Composite Firmware
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A Zephyr-based firmware for the EWS board that provides:
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- CAN FD to gs_usb interface (similar to candlelight)
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- USB CDC interface for PFET control
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- USB composite device functionality
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## Features
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- **CAN FD Support**: Full CAN FD protocol support via gs_usb interface
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- **USB Composite**: Single USB device with multiple interfaces:
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- gs_usb interface for CAN communication
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- CDC ACM interface for PFET control and status
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- **PFET Control**: Control both output PFETs via CDC commands
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- **Status LEDs**: Control status LEDs for visual feedback
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- **Compatible**: Works with standard CAN utilities (can-utils, etc.)
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## Hardware Target
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- **MCU**: STM32G0B1KBU6 (on EWS board)
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- **CAN**: CAN FD via FDCAN1 (PB0/PB1) with SN65HVD230 transceiver
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- **USB**: USB 2.0 Full Speed (PA11/PA12)
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- **GPIOs**:
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- PFET1 control: PA8
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- PFET2 control: PB2
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- Status LED: PB4
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## Build Requirements
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- Zephyr RTOS (v3.5+)
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- West build tool
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- ARM GCC toolchain
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## Building
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```bash
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west build -b ews
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```
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## CDC Protocol
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The CDC interface uses simple text commands:
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- `PFET1_ON\n` - Turn on PFET1
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- `PFET1_OFF\n` - Turn off PFET1
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- `PFET2_ON\n` - Turn on PFET2
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- `PFET2_OFF\n` - Turn off PFET2
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- `STATUS\n` - Get current PFET status |