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#![no_std]
#![no_main]
use defmt::*;
use embassy_executor::Spawner;
use embassy_stm32::sdmmc::Sdmmc;
use embassy_stm32::sdmmc::sd::{CmdBlock, DataBlock, StorageDevice};
use embassy_stm32::time::{Hertz, mhz};
use embassy_stm32::{Config, bind_interrupts, peripherals, sdmmc};
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();
{
use embassy_stm32::rcc::*;
config.rcc.hse = Some(Hse {
freq: Hertz(8_000_000),
mode: HseMode::Bypass,
});
config.rcc.pll_src = PllSource::HSE;
config.rcc.pll = Some(Pll {
prediv: PllPreDiv::DIV4,
mul: PllMul::MUL168,
divp: Some(PllPDiv::DIV2), // 8mhz / 4 * 168 / 2 = 168Mhz.
divq: Some(PllQDiv::DIV7), // 8mhz / 4 * 168 / 7 = 48Mhz.
divr: None,
});
config.rcc.ahb_pre = AHBPrescaler::DIV1;
config.rcc.apb1_pre = APBPrescaler::DIV4;
config.rcc.apb2_pre = APBPrescaler::DIV2;
config.rcc.sys = Sysclk::PLL1_P;
}
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 cmd_block = CmdBlock::new();
let mut storage = StorageDevice::new_sd_card(&mut sdmmc, &mut cmd_block, mhz(24))
.await
.unwrap();
let card = storage.card();
info!("Card: {:#?}", Debug2Format(&card));
info!("Clock: {}", storage.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::new();
storage.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);
storage.write_block(block_idx, &block).await.unwrap();
info!("Write done");
storage.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);
storage.write_block(block_idx, &block).await.unwrap();
info!("Write done");
storage.read_block(block_idx, &mut block).await.unwrap();
info!("Read: {=[u8]:X}...{=[u8]:X}", block[..8], block[512 - 8..]);
}
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