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