#![no_std]
#![no_main]
use embedded_hal_1::spi::SpiBus;
use esp32_hal::{
clock::ClockControl,
gpio::IO,
peripherals::Peripherals,
prelude::*,
spi::{master::Spi, SpiMode},
Delay,
};
use esp_backtrace as _;
use esp_println::{print, println};
#[entry]
fn main() -> ! {
let peripherals = Peripherals::take();
let system = peripherals.SYSTEM.split();
let clocks = ClockControl::boot_defaults(system.clock_control).freeze();
let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
let sclk = io.pins.gpio19;
let miso = io.pins.gpio25;
let mosi = io.pins.gpio23;
let cs = io.pins.gpio22;
let mut spi = Spi::new(peripherals.SPI2, 1000u32.kHz(), SpiMode::Mode0, &clocks).with_pins(
Some(sclk),
Some(mosi),
Some(miso),
Some(cs),
);
let mut delay = Delay::new(&clocks);
println!("=== SPI example with embedded-hal-1 traits ===");
loop {
print!("Starting symmetric transfer...");
let write = [0xde, 0xad, 0xbe, 0xef];
let mut read: [u8; 4] = [0x00u8; 4];
SpiBus::transfer(&mut spi, &mut read[..], &write[..]).expect("Symmetric transfer failed");
assert_eq!(write, read);
println!(" SUCCESS");
delay.delay_ms(250u32);
print!("Starting asymetric transfer (read > write)...");
let mut read: [u8; 4] = [0x00; 4];
SpiBus::transfer(&mut spi, &mut read[0..2], &write[..])
.expect("Asymmetric transfer failed");
assert_eq!(write[0], read[0]);
assert_eq!(read[2], 0x00u8);
println!(" SUCCESS");
delay.delay_ms(250u32);
print!("Starting huge transfer...");
let mut write = [0x55u8; 4096];
for byte in 0..write.len() {
write[byte] = byte as u8;
}
let mut read = [0x00u8; 4096];
SpiBus::transfer(&mut spi, &mut read[..], &write[..]).expect("Huge transfer failed");
assert_eq!(write, read);
println!(" SUCCESS");
delay.delay_ms(250u32);
print!("Starting huge transfer (in-place)...");
let mut write = [0x55u8; 4096];
for byte in 0..write.len() {
write[byte] = byte as u8;
}
SpiBus::transfer_in_place(&mut spi, &mut write[..]).expect("Huge transfer failed");
for byte in 0..write.len() {
assert_eq!(write[byte], byte as u8);
}
println!(" SUCCESS");
delay.delay_ms(250u32);
}
}