ftdi_embedded_hal SPI example

spi.rs

use std::path::Path;
use ftdi_embedded_hal as hal;

#[derive(Debug)]
pub enum Error {
    GeneralError(String)
}

trait SPIBus {
    fn transfer<'w>(&mut self, words: &'w mut [u8]) -> Result<&'w [u8], Error>;
}

impl<'a> SPIBus for ftdi_embedded_hal::Spi<'a, ftdi::Device>
{
    fn transfer<'w>(&mut self, words: &'w mut [u8]) -> Result<&'w [u8], Error> {
        embedded_hal::blocking::spi::Transfer::transfer(self, words).map_err(|_| Error::GeneralError("foo".to_string()))
    }
}


fn init_spi_device(config_file: &Path) -> Box<dyn SPIBus> {
    // .. load device depending on configuration file
    
    let device = ftdi::find_by_vid_pid(0x0403, 0x6010)
        .interface(ftdi::Interface::A)
        .open()
        .unwrap();

    let hal = hal::FtHal::init_freq(device, 3_000_000).unwrap();
    let spi = hal.spi().unwrap();

    Box::new(spi)
}


fn main() {
    let spi_device = init_spi_device(todo!());
    
    // ... use spi device and pass it to drivers
}