wspr 0.1.0

WSPR encoder
Documentation 
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### WSPR

`wspr` is a Rust crate for encoding a callsign, a four character Maidenhead
grid square, and a power level (in dBm) into the 162 symbols needed for a WSPR
transmission. Each resulting symbol is in the range 0-3 and may be transmitted
using 4 tone FSK.

Each tone is separated by 1.464Hz and is 683ms in length.

Only Type 1 WSPR messages are supported.

### no_std

The `wspr` crate is `no_std` by default.

### Optional Features

The `wspr` crate provides the following optional Cargo features:
  - `defmt-03`: Implements `defmt::Format` for `wspr::Error`

### Example

```rust

if let Ok(symbols) = wspr::encode("KA1BCD", "FM17", 37) {
    // 20m WSPR dial frequency in KHz
    let dial = 14095.6;

    // WSPR transmit frequencies are 1.5KHz above the dial frequency
    let offset = 1.5;

    for symbol in symbols.iter() {
        let frequency = dial + offset + (0.001464 * symbol);
        // A notional WSPR transmission
        // set_frequency(frequency);
        // enable_tx();
        // sleep_ms(683);
    }
    // disable_tx();
}
```