ask433 0.2.1

A no_std, embedded-hal ASK/OOK modem driver for 433 MHz RF modules (e.g., FS1000A). Supports RX/TX, 4b6b encoding, and software PLL demodulation.
Documentation 
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pub(crate) fn crc_ccitt_update(crc: u16, data: &u8) -> u16 {
    let mut d = *data as u16;
    d = d ^ lo8(crc);
    d = d ^ (d << 4);
    d = (d as u8) as u16; // Ensure d is treated as a u8 for the next operations

    ((d << 8) | hi8(crc)) ^ (((d >> 4) as u8) as u16) ^ (d << 3)
}

pub(crate) fn lo8(x: u16) -> u16 {
    x & 0xff
}

pub(crate) fn hi8(x: u16) -> u16 {
    x >> 8
}