# ESP32 LoRa (SX127*)

Provides SPI driver for SX1276/SX1278 LoRa radio

## Install

Designed to be used as `esp-idf component`. Suggested using as `git submodule`

```
git submodule add https://gitlab.com/morganrallen/esp32-lora.git components/esp32-lora/
git submodule init
git submodule update
```

## Configure

Uses built in KConfig. Run `make menuconfig` and find config under `Component config` -> `LORA32`.
Defaults targeted to TTGO LoRa OLED boards.

## Use
This is the most basic usage. Setting up the LoRa instance, setting it's receive handler, running init then sending a message.

```
  lora32_cfg_t lora;
  lora = lora32_create();
  lora.receive = &handle_lora_receive;

  lora32_init(&lora);

  lora32_send(&lora, "Hello, LoRa", 11);

```

## API

### `lora32_cfg_t static lora32_create()`
Creates a new LoRa instance

### `uint8_t lora32_init(lora32_cfg_t *config)`
Initialized LoRa instance. This configures GPIOs, SPI, LoRa radio and receive handlers

Returns 1 on success.

### `uint8_t lora32_data_available(lora32_cfg_t *lora)`
Indicates if data is presently available.

### `uint8_t lora32_parse_packet(lora32_cfg_t *lora, uint8_t size)`

### `void lora32_send(lora32_cfg_t *config, uint8_t *data, uint8_t len)`
Transmits data over the LoRa radio.

### `void lora32_set_spreadfactor(lora32_cfg_t *lora, uint8_t factor)`
Sets LoRa Spread Factor.

Accepts `6`-`12`.

### `void lora32_dump_regs(lora32_cfg_t *lora)`
Dumps all registers from SX1276