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1.8 KiB

#![no_main]
#![no_std]
use panic_halt as _;
use stm32f0xx_hal as hal;
use crate::hal::{
pac,
prelude::*,
serial::Serial,
spi::Spi,
spi::{Mode, Phase, Polarity},
};
use nb::block;
use cortex_m_rt::entry;
/// A basic serial to spi example
///
/// If you connect MOSI & MISO pins together, you'll see all characters
/// that you typed in your serial terminal echoed back
///
/// If you connect MISO to GND, you'll see nothing coming back
#[entry]
fn main() -> ! {
const MODE: Mode = Mode {
polarity: Polarity::IdleHigh,
phase: Phase::CaptureOnSecondTransition,
};
if let Some(p) = pac::Peripherals::take() {
let mut flash = p.FLASH;
let mut rcc = p.RCC.configure().freeze(&mut flash);
let gpioa = p.GPIOA.split(&mut rcc);
let (sck, miso, mosi, tx, rx) = cortex_m::interrupt::free(move |cs| {
(
// SPI pins
gpioa.pa5.into_alternate_af0(cs),
gpioa.pa6.into_alternate_af0(cs),
gpioa.pa7.into_alternate_af0(cs),
// USART pins
gpioa.pa9.into_alternate_af1(cs),
gpioa.pa10.into_alternate_af1(cs),
)
});
// Configure SPI with 1MHz rate
let mut spi = Spi::spi1(p.SPI1, (sck, miso, mosi), MODE, 1.mhz(), &mut rcc);
let serial = Serial::usart1(p.USART1, (tx, rx), 115_200.bps(), &mut rcc);
let (mut tx, mut rx) = serial.split();
let mut data = [0];
loop {
let serial_received = block!(rx.try_read()).unwrap();
spi.try_write(&[serial_received]).ok();
let spi_received = spi.try_transfer(&mut data).unwrap();
block!(tx.try_write(spi_received[0])).ok();
}
}
loop {
continue;
}
}