Introduction

This crate provides the device driver package Wio_E5.Ham2 for the Seeed Studio Wio-E5 LoRa Transceiver Module operating in test aka P2P (so-called Peer to Peer or Point to Point) broadcast mode.

See WioE5LoRaP2P.pdf for more information about the LoRa wireless system and operating the Wio-E5 module in P2P mode.

Wio_E5.Ham2 is derived from Wio_E5.P2P (see crate wioe5_p2p). It reserves the first twenty-two bytes of the payload for address information to implement Amateur Radio Unicast Flavor #2, which creates a amateur radio Local Area Network, operated under a Technician or higher license, in the 33-cm band (902 to 928 MHz in the United States, 915 to 928 MHz in New Zealand, and possible allocations in other ITU Region 2 countries).

The code for this crate has been extracted from the Linux Simple I/O Library project.

API

The API for this device driver is documented in the Wio-E5.Ham2 package specification.

Wio-E5.Ham2 is a generic package that must be instantiated with two Positive value parameters, for maximum payload size (1 to 241 bytes) and FIFO queue depth. The default values for the generic formal parameters will prove satisfactory for most purposes. Depending on what kind of data you are going to be sending, you might want reduce the maximum payload size to match some other protocol, such as 64 bytes for the Remote I/O Protocol.

Minimal Test Program

WITH Wio_E5.Ham2;

PROCEDURE HelloWorld IS

  PACKAGE LoRa IS NEW Wio_E5.Ham2;

  dev : LoRa.Device;

BEGIN
  dev := LoRa.Create("/dev/ttyUSB0", 115200, "XX0XXX    ", 1, 915.0);
  dev.Send("Hello, World!", "YY0YYY    ", 1);
  dev.Shutdown;
END HelloWorld;

More example programs are available at: https://github.com/pmunts/libsimpleio/tree/master/ada/programs/wioe5/ham2.