esp-hal/hil-test/tests/spi_full_duplex.rs

//! SPI Full Duplex Test
//!
//! Folowing pins are used:
//! SCLK    GPIO0
//! MISO    GPIO2 / GPIO9  (esp32s2 / esp32s3) / GPIO26 (esp32)
//! MOSI    GPIO3 / GPIO10 (esp32s2 / esp32s3) / GPIO27 (esp32)
//!
//! Connect MISO and MOSI pins.

//% CHIPS: esp32 esp32c2 esp32c3 esp32c6 esp32h2 esp32s2 esp32s3

#![no_std]
#![no_main]

use embedded_hal::spi::SpiBus;
use esp_hal::{
    gpio::Io,
    prelude::*,
    spi::{master::Spi, FullDuplexMode, SpiMode},
};
use hil_test as _;

struct Context {
    spi: Spi<'static, esp_hal::peripherals::SPI2, FullDuplexMode>,
}

#[cfg(test)]
#[embedded_test::tests]
mod tests {
    use defmt::assert_eq;

    use super::*;

    #[init]
    fn init() -> Context {
        let peripherals = esp_hal::init(esp_hal::Config::default());

        let io = Io::new(peripherals.GPIO, peripherals.IO_MUX);

        let sclk = io.pins.gpio0;
        let (miso, mosi) = hil_test::common_test_pins!(io);

        let spi = Spi::new(peripherals.SPI2, 1000u32.kHz(), SpiMode::Mode0)
            .with_sck(sclk)
            .with_mosi(mosi)
            .with_miso(miso);

        Context { spi }
    }

    #[test]
    #[timeout(3)]
    fn test_symmetric_transfer(mut ctx: Context) {
        let write = [0xde, 0xad, 0xbe, 0xef];
        let mut read: [u8; 4] = [0x00u8; 4];

        SpiBus::transfer(&mut ctx.spi, &mut read[..], &write[..])
            .expect("Symmetric transfer failed");
        assert_eq!(write, read);
    }

    #[test]
    #[timeout(3)]
    fn test_asymmetric_transfer(mut ctx: Context) {
        let write = [0xde, 0xad, 0xbe, 0xef];
        let mut read: [u8; 4] = [0x00; 4];

        SpiBus::transfer(&mut ctx.spi, &mut read[0..2], &write[..])
            .expect("Asymmetric transfer failed");
        assert_eq!(write[0], read[0]);
        assert_eq!(read[2], 0x00u8);
    }

    #[test]
    #[timeout(3)]
    fn test_symmetric_transfer_huge_buffer(mut ctx: Context) {
        let mut write = [0x55u8; 4096];
        for byte in 0..write.len() {
            write[byte] = byte as u8;
        }
        let mut read = [0x00u8; 4096];

        SpiBus::transfer(&mut ctx.spi, &mut read[..], &write[..]).expect("Huge transfer failed");
        assert_eq!(write, read);
    }

    #[test]
    #[timeout(3)]
    fn test_symmetric_transfer_huge_buffer_no_alloc(mut ctx: Context) {
        let mut write = [0x55u8; 4096];
        for byte in 0..write.len() {
            write[byte] = byte as u8;
        }

        ctx.spi
            .transfer_in_place(&mut write[..])
            .expect("Huge transfer failed");
        for byte in 0..write.len() {
            assert_eq!(write[byte], byte as u8);
        }
    }
}