# IO Module Blazor Dashboard

A Blazor Server web application for monitoring and controlling the STM32H723ZG Nucleo IO module over CAN bus and serial.

## What This App Does

- **Button Status** — Live indicators for the three push buttons (User/Button1/Button2) received via CAN
- **Termination Control** — Toggle TERM_ON and TERM_OFF outputs on the CAN hat (sends CAN `0x240`)
- **CAN Monitor** — Full CAN management: connect/disconnect, live message stream, filter and signal decoder, manual message sender
- **Serial Terminal** — Connect to the STM32's ST-Link VCP for NVMEM EEPROM read/write commands

## Requirements

- **.NET 10 SDK**
- **PEAK PCAN adapter** (e.g. PCAN-USB) with PCAN-Basic drivers installed
- STM32H723ZG Nucleo board running the [IOModuleBlazorTest firmware](../STM32Nucleo/)

## Running the App

```
cd IOModuleTestBlazor
dotnet run
```

Then open `https://localhost:5001` in a browser.

## Pages

| Page | Route | Description |
|------|-------|-------------|
| Home | `/` | Button status, termination control, CAN message list |
| CAN Monitor | `/can-monitor` | Full CAN management — connect, filters, signal decoder, send |
| Serial Terminal | `/serial` | ST-Link VCP terminal for NVMEM EEPROM commands |

## CAN Bus Setup

1. Connect the PCAN-USB adapter to the Nucleo CAN transceiver
2. Open the app and navigate to **CAN Monitor**
3. Select the PCAN channel and set bitrate to **500 kbps**
4. Click **Connect** — the app auto-scans for available PCAN USB channels

## Termination Control (Home page)

Two independent toggles map directly to the CAN hat's termination relay outputs:

| Button | CAN `0x240` bit | STM32 pin |
|--------|-----------------|-----------|
| TERM_ON | Bit 0 | PB10 (CN10-32) |
| TERM_OFF | Bit 1 | PB11 (CN10-34) |

Clicking a toggle immediately sends a `0x240` frame. Buttons are disabled when not connected.

## Serial Terminal (NVMEM Commands)

Connect to the Nucleo's ST-Link USB virtual COM port at **115200 baud**.

| Command | Description |
|---------|-------------|
| `r <addr> <len>` | Read `len` bytes (1–5) from EEPROM at hex address |
| `w <addr> <b0> [b1...]` | Write 1–5 bytes to EEPROM |
| `?` | Show help |

Example: `r 0000 4` reads 4 bytes at address 0x0000.

See [STM32 firmware docs/NVMEMCommands.md](../STM32Nucleo/docs/NVMEMCommands.md) for the full reference.

## Project Structure

```
IOModuleTestBlazor/
├── Components/
│   ├── Layout/
│   │   └── NavMenu.razor          # Navigation sidebar
│   └── Pages/
│       ├── Home.razor             # Dashboard: buttons + termination + messages
│       ├── CanMonitor.razor       # Full CAN management UI
│       └── SerialTerminal.razor   # NVMEM serial command terminal
├── Services/
│   ├── ICanService.cs / CanService.cs     # PCAN adapter wrapper
│   └── ISerialPortService.cs / SerialPortService.cs  # Serial port wrapper
├── Models/
│   └── CanModels.cs               # CanMessageDto, CanFilter, CanBitmask
├── CanWorker.cs                   # Background CAN message reader
└── Program.cs                     # DI registration, middleware
```

## Dependencies

| Package | Purpose |
|---------|---------|
| `Peak.PCANBasic.NET` | PCAN hardware CAN adapter driver |
| `Microsoft.AspNetCore.SignalR.Client` | Real-time Blazor Server transport |