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#![no_std]
#![no_main]
use core::fmt::Write;
use core::str::from_utf8;
use cortex_m_rt::entry;
use defmt::*;
use embassy_executor::Executor;
use embassy_stm32::mode::Blocking;
use embassy_stm32::time::mhz;
use embassy_stm32::{Config, spi};
use heapless::String;
use static_cell::StaticCell;
use {defmt_rtt as _, panic_probe as _};
#[embassy_executor::task]
async fn main_task(mut spi: spi::Spi<'static, Blocking, spi::mode::Master>) {
for n in 0u32.. {
let mut write: String<128> = String::new();
core::write!(&mut write, "Hello DMA World {}!\r\n", n).unwrap();
unsafe {
let result = spi.blocking_transfer_in_place(write.as_bytes_mut());
if let Err(_) = result {
defmt::panic!("crap");
}
}
info!("read via spi: {}", from_utf8(write.as_bytes()).unwrap());
}
}
static EXECUTOR: StaticCell<Executor> = StaticCell::new();
#[entry]
fn main() -> ! {
info!("Hello World!");
let mut config = Config::default();
{
use embassy_stm32::rcc::*;
config.rcc.hsi = Some(HSIPrescaler::DIV1);
config.rcc.csi = true;
config.rcc.pll1 = Some(Pll {
source: PllSource::HSI,
prediv: PllPreDiv::DIV4,
mul: PllMul::MUL50,
divp: Some(PllDiv::DIV2),
divq: Some(PllDiv::DIV8), // used by SPI3. 100Mhz.
divr: None,
});
config.rcc.sys = Sysclk::PLL1_P; // 400 Mhz
config.rcc.ahb_pre = AHBPrescaler::DIV2; // 200 Mhz
config.rcc.apb1_pre = APBPrescaler::DIV2; // 100 Mhz
config.rcc.apb2_pre = APBPrescaler::DIV2; // 100 Mhz
config.rcc.apb3_pre = APBPrescaler::DIV2; // 100 Mhz
config.rcc.apb4_pre = APBPrescaler::DIV2; // 100 Mhz
config.rcc.voltage_scale = VoltageScale::Scale1;
}
let p = embassy_stm32::init(config);
let mut spi_config = spi::Config::default();
spi_config.frequency = mhz(1);
let spi = spi::Spi::new_blocking(p.SPI3, p.PB3, p.PB5, p.PB4, spi_config);
let executor = EXECUTOR.init(Executor::new());
executor.run(|spawner| {
spawner.spawn(unwrap!(main_task(spi)));
})
}
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