Hardware Abstraction Layer for 'Secure' digital input/output MultiMediaCard interface (SDMMC) on the STM32H7.
This crate depends on the GPIO and Clock functionality from
[stm32h7xx-hal].
The H7 has two SDMMC peripherals, SDMMC1 and SDMMC2.
For high speed signalling (bus clock > 16MHz), the IO speed needs to be increased from the default.
```rust use stm32h7xx_hal::gpio::Speed;
let d0 = d0.set_speed(Speed::VeryHigh); ```
By default the SDMMC bus clock is derived from the pll1_q_ck. This can be
set when initialising the RCC.
rust
let ccdr = rcc
.pll1_q_ck(100.mhz())
.freeze(vos, &dp.SYSCFG);
There is an extension trait implemented for the SDMMC1
and SDMMC2 periperhals for easy initialisation.
rust
// Create SDMMC
let mut sdmmc = dp.SDMMC1.sdmmc(
(clk, cmd, d0, d1, d2, d3),
ccdr.peripheral.SDMMC1,
&ccdr.clocks,
);
The next step is to initialise a card. The bus speed is also set.
rust
if let Err(err) = sdmmc.init_card(10.mhz()) {
info!("Init err: {:?}", err);
}
The card() method returns useful information about
the card.
rust
let card = sdmmc.card();
if let Some(card) = sdmmc.card() {
info!("SD Card Connected: {:?}", card);
}
Licensed under either of
at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
License: MIT/Apache-2.0