Function autd3_driver::cpu::gain_stm_legacy_body

pub fn gain_stm_legacy_body(
    gain: &[&[LegacyDrive]], 
    is_first_frame: bool, 
    freq_div: u32, 
    is_last_frame: bool, 
    mode: Mode, 
    tx: &mut TxDatagram
) -> Result<()>