embassy/examples/stm32l4/src/bin/spi.rs

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2021-06-08 16:36:47 +02:00
#![no_std]
#![no_main]
#![feature(trait_alias)]
#![feature(min_type_alias_impl_trait)]
#![feature(impl_trait_in_bindings)]
#![feature(type_alias_impl_trait)]
#![allow(incomplete_features)]
#[path = "../example_common.rs"]
mod example_common;
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use embassy_stm32::gpio::{Level, Output, Speed};
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use embedded_hal::digital::v2::OutputPin;
use example_common::*;
use cortex_m_rt::entry;
use embassy_stm32::spi::{Config, Spi};
use embassy_stm32::time::Hertz;
use embedded_hal::blocking::spi::Transfer;
use stm32l4::stm32l4x5 as pac;
#[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.ahb2enr.modify(|_, w| {
w.gpioaen().set_bit();
w.gpioben().set_bit();
w.gpiocen().set_bit();
w.gpioden().set_bit();
w.gpioeen().set_bit();
w.gpiofen().set_bit();
w
});
let p = embassy_stm32::init(Default::default());
let mut spi = Spi::new(
p.SPI3,
p.PC10,
p.PC12,
p.PC11,
Hertz(1_000_000),
Config::default(),
);
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let mut cs = Output::new(p.PE0, Level::High, Speed::VeryHigh);
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loop {
let mut buf = [0x0A; 4];
unwrap!(cs.set_low());
unwrap!(spi.transfer(&mut buf));
unwrap!(cs.set_high());
info!("xfer {=[u8]:x}", buf);
}
}