loopback/
loopback.rs

1// SPDX-FileCopyrightText: 2018-2022 Joonas Javanainen <joonas.javanainen@gmail.com>
2//
3// SPDX-License-Identifier: MIT OR Apache-2.0
4
5extern crate mcp2210;
6
7use hidapi::HidApi;
8use mcp2210::{open_first, Commands, SpiMode, SpiTransferSettings};
9
10fn main() {
11    //! ##################################################################################
12    //! ##                                ⚠️ WARNING ⚠️                                   ##
13    //! ## This code sends 0xaa55 on the MCP2210's SPI bus.                             ##
14    //! ## If you have a device connected to the SPI bus, ensure this will not harm it. ##
15    //! ##################################################################################
16    //! #
17    //! This code sends 0xaa55 on the MCP2210's SPI bus MOSI pin and asserts that the same
18    //! data is simultaneously recieved at the MISO pin. The circuit required for this is
19    //! simply a wire between the MOSI and MISO pins of the MCP2210 and no real slave device.
20
21    let hidapi_context = HidApi::new().expect("Could not create hidapi context");
22    let mut mcp = open_first(&hidapi_context).expect("Failed to connect");
23    mcp.set_spi_transfer_settings(&SpiTransferSettings {
24        bit_rate: 1_000,
25        bytes_per_tx: 2,
26        spi_mode: SpiMode::Mode0,
27        ..Default::default()
28    })
29    .expect("Failed to set settings");
30    let mut buf = Vec::new();
31    mcp.spi_transfer_to_end(&[0xaa, 0x55], &mut buf)
32        .expect("SPI transfer failed");
33    assert_eq!(buf, [0xaa, 0x55]);
34}
loopback/loopback.rs

loopback/
loopback.rs
