Crate umsh_radio_loraphy 

lora-phy-backed LoRa radio driver implementing umsh_hal::Radio.

Works with any chip that implements lora_phy::mod_traits::RadioKind (SX126x, LR11xx, etc.). Per-board parameters (frequency, modulation, preamble, TCXO, RF switch) are supplied by the caller — this crate only owns the RX/TX state machine.

Architecture

Two concurrent actors share a Channels bundle:

1. runner — an Embassy task that owns the lora_phy::LoRa instance. It loops between continuous RX and TX: when a TX request arrives on the TX channel it exits RX, transmits, signals the result, then re-enters RX. A request that arrives while a frame is being received is refused with TxError::CadTimeout (up to RX_GATE_MAX_STRIKES times) instead of tearing down the reception — the channel is busy either way, and the MAC already backs off and retries on that error.

2. LoraphyRadio — a lightweight handle used by the MAC coordinator. It borrows &'static Channels for transmit() (sends request, awaits result signal) and poll_receive() (non-blocking probe of the RX channel with waker registration via AtomicWaker).

Usage

use umsh_radio_loraphy::{Channels, LoraphyRadio};
use embassy_sync::blocking_mutex::raw::ThreadModeRawMutex;

static RADIO_CH: Channels<ThreadModeRawMutex, 4, 2> = Channels::new();
// Spawn runner(lora, &RADIO_CH, mdltn, rx_pkt, tx_pkt, power_dbm).
// Pass LoraphyRadio::new(&RADIO_CH, t_frame_ms) to the MAC.

Structs

Channels

Shared state between LoraphyRadio and runner. Place in a static.

DeviceControl

Control handle for device_runner: latest-wins settings updates and on-demand instantaneous-RSSI sampling. Place in a static next to the Channels.

DeviceSettings

Radio settings applied at runtime by the ULCP session.

LoraphyRadio

Implements umsh_hal::Radio over the shared Channels.

RxFrame

A received frame plus signal metadata.

TxRequest

A queued transmit request from the MAC to the runner task.

Enums

CadPolicy

Channel-activity-detection (CAD) policy applied before a transmit.

TxError

Error returned by [Radio::transmit].

Constants

MAX_PAYLOAD

Maximum SX1262 LoRa payload: 255 bytes.

MESHCORE_US_FREQUENCY_HZ

MeshCore US band frequency (confirmed from MeshCore source).

RX_GATE_MAX_STRIKES

Maximum consecutive TX requests refused with TxError::CadTimeout while a reception appears to be in progress (preamble seen, frame not finished).

UMSH_FREQUENCY_HZ

Frequency used by default for UMSH in the 915 MHz ISM band.

Functions

airtime_ms

Conservative upper bound on LoRa on-air time in milliseconds.

bandwidth_from_hz

Convert a bandwidth in Hz (the ULCP representation) to the lora-phy enum. Returns None for unsupported values.

coding_rate_from_denom

Convert a coding-rate denominator (5 for 4/5 .. 8 for 4/8) to the lora-phy enum.

default_params

Build the default modulation and packet parameters for UMSH bringup.

device_runner

Device variant of runner: same RX/TX state machine, but the modulation parameters, frequency, and power come from an DeviceControl at runtime instead of being fixed at spawn.

meshcore_us_params

Build modulation + packet parameters matching MeshCore US (915 MHz band).

runner

Background loop: owns the lora_phy::LoRa instance, switches between continuous RX and TX as requests arrive. Never returns.

spreading_factor_from_u8

Convert a numeric spreading factor (5-12) to the lora-phy enum.