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