embassy/embassy-stm32-examples/src/bin/spi.rs

#![no_std]
#![no_main]
#![feature(trait_alias)]
#![feature(min_type_alias_impl_trait)]
#![feature(impl_trait_in_bindings)]
#![feature(type_alias_impl_trait)]

#[path = "../example_common.rs"]
mod example_common;

use embassy_stm32::gpio::{Level, Output, Input, Pull};
use embedded_hal::digital::v2::{OutputPin, InputPin};
use example_common::*;

use cortex_m_rt::entry;
use stm32f4::stm32f429 as pac;
//use stm32l4::stm32l4x5 as pac;
use embassy_stm32::spi::{Spi, MODE_0, ByteOrder, Config};
use embassy_stm32::time::Hertz;
use embedded_hal::blocking::spi::Transfer;

#[entry]
fn main() -> ! {
    info!("Hello World, dude!");

    let pp = pac::Peripherals::take().unwrap();

    pp.DBGMCU.cr.modify(|_, w| {
        w.dbg_sleep().set_bit();
        w.dbg_standby().set_bit();
        w.dbg_stop().set_bit()
    });
    pp.RCC.ahb1enr.modify(|_, w| w.dma1en().set_bit());

    pp.RCC.apb1enr.modify(|_, w| {
        w.spi3en().enabled();
        w
    });

    pp.RCC.ahb1enr.modify(|_, w| {
        w.gpioaen().enabled();
        w.gpioben().enabled();
        w.gpiocen().enabled();
        w.gpioden().enabled();
        w.gpioeen().enabled();
        w.gpiofen().enabled();
        w
    });

    let rc = pp.RCC.cfgr.read().sws().bits();
    info!("rcc -> {}", rc);
    let p = embassy_stm32::init(Default::default());

    let mut led = Output::new(p.PA5, Level::High);
    let mut spi = Spi::new(
        Hertz(16_000_000),
        p.SPI3,
        p.PC10,
        p.PC12,
        p.PC11,
        Hertz(1_000_000),
        Config::default(),
    );

    let mut cs = Output::new( p.PE0, Level::High);
    cs.set_low();

    let mut rdy = Input::new(p.PE1, Pull::Down);
    let mut wake = Output::new( p.PB13, Level::Low);
    let mut reset = Output::new( p.PE8, Level::Low);

    wake.set_high().unwrap();
    reset.set_high().unwrap();

    loop {
        info!("loop");
        while rdy.is_low().unwrap() {
            info!("await ready")
        }
        info!("ready");
        let mut buf = [0x0A;4];
        spi.transfer(&mut buf);
        info!("xfer {=[u8]:x}", buf);
    }

    loop {
        info!("high");
        led.set_high().unwrap();
        cortex_m::asm::delay(10_000_000);
        info!("low");
        led.set_low().unwrap();
        cortex_m::asm::delay(10_000_000);
    }
}