Hardware Peripherals

Human can interact with hardware boards through the hu_peripheral_t vtable. Peripherals expose read, write, and flash operations.

Peripheral vtable interface

| Method | Description | | ----------------- | ---------------------------------------- | | name | Peripheral identifier | | board_type | Board type (e.g. arduino, stm32, rpi) | | health_check | Report connectivity | | init_peripheral | Initialize connection | | read | Read byte at address | | write | Write byte to address | | flash | Flash firmware from path | | capabilities | Board capabilities (GPIO, flash, serial) | | destroy | Cleanup |

Supported peripherals

Arduino

• Transport: Serial (JSON protocol)
• Config: serial_port (e.g. /dev/ttyUSB0, COM3)
• Protocol: JSON commands over serial; responses in JSON
• Capabilities: GPIO, serial, ADC (model-dependent)

STM32 / Nucleo

• Transport: probe-rs CLI (SWD/JTAG)
• Config: chip (e.g. STM32F401RETx)
• Flash: probe-rs for flashing firmware
• Capabilities: Flash, read/write memory maps

Raspberry Pi

• Transport: GPIO (Linux sysfs or similar)
• Config: No serial/chip; uses system GPIO
• Capabilities: GPIO read/write

Enabling peripherals

Config:

{
  "peripherals": {
    "enabled": true,
    "datasheet_dir": "/path/to/datasheets"
  },
  "hardware": {
    "enabled": true,
    "transport": "serial",
    "serial_port": "/dev/ttyUSB0",
    "baud_rate": 115200,
    "probe_target": "STM32F401RETx"
  }
}

Build: Peripherals are included when the main binary is built; no separate flag for Arduino/STM32/RPi.

Tools using peripherals

• hardware_memory — Read/write memory maps via probe-rs or serial
• hardware_info — Query system and peripheral info

Non-Linux platforms

On macOS/Windows, peripheral support may return HU_ERR_NOT_SUPPORTED for serial or probe-rs–based backends. Use explicit error handling rather than silent no-ops.