90 lines
2.4 KiB
Rust
90 lines
2.4 KiB
Rust
#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_stm32::sdmmc::{DataBlock, Sdmmc};
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use embassy_stm32::time::mhz;
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use embassy_stm32::{interrupt, Config};
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use {defmt_rtt as _, panic_probe as _};
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/// This is a safeguard to not overwrite any data on the SD card.
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/// If you don't care about SD card contents, set this to `true` to test writes.
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const ALLOW_WRITES: bool = false;
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#[embassy_executor::main]
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async fn main(_spawner: Spawner) {
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let mut config = Config::default();
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config.rcc.sys_ck = Some(mhz(48));
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config.rcc.pll48 = true;
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let p = embassy_stm32::init(config);
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info!("Hello World!");
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let irq = interrupt::take!(SDIO);
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let mut sdmmc = Sdmmc::new_4bit(
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p.SDIO,
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irq,
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p.DMA2_CH3,
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p.PC12,
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p.PD2,
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p.PC8,
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p.PC9,
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p.PC10,
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p.PC11,
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Default::default(),
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);
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// Should print 400kHz for initialization
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info!("Configured clock: {}", sdmmc.clock().0);
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let mut err = None;
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loop {
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match sdmmc.init_card(mhz(24)).await {
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Ok(_) => break,
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Err(e) => {
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if err != Some(e) {
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info!("waiting for card error, retrying: {:?}", e);
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err = Some(e);
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}
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}
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}
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}
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let card = unwrap!(sdmmc.card());
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info!("Card: {:#?}", Debug2Format(card));
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info!("Clock: {}", sdmmc.clock());
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// Arbitrary block index
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let block_idx = 16;
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// SDMMC uses `DataBlock` instead of `&[u8]` to ensure 4 byte alignment required by the hardware.
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let mut block = DataBlock([0u8; 512]);
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sdmmc.read_block(block_idx, &mut block).await.unwrap();
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info!("Read: {=[u8]:X}...{=[u8]:X}", block[..8], block[512 - 8..]);
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if !ALLOW_WRITES {
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info!("Writing is disabled.");
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loop {}
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}
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info!("Filling block with 0x55");
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block.fill(0x55);
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sdmmc.write_block(block_idx, &block).await.unwrap();
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info!("Write done");
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sdmmc.read_block(block_idx, &mut block).await.unwrap();
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info!("Read: {=[u8]:X}...{=[u8]:X}", block[..8], block[512 - 8..]);
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info!("Filling block with 0xAA");
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block.fill(0xAA);
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sdmmc.write_block(block_idx, &block).await.unwrap();
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info!("Write done");
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sdmmc.read_block(block_idx, &mut block).await.unwrap();
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info!("Read: {=[u8]:X}...{=[u8]:X}", block[..8], block[512 - 8..]);
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}
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