Module stm32h7xx_hal::sdmmc [−][src]
Expand description
SD MultiMediaCard interface (SDMMC)
For HDHC / SDXC / SDUC cards. SDSC cards are not supported.
The H7 has two SDMMC peripherals, SDMMC1 and SDMMC2.
Examples
IO Setup
For high speed signalling (bus clock > 16MHz), the IO speed needs to be increased from the default.
use stm32h7xx_hal::gpio::Speed;
let d0 = d0.set_speed(Speed::VeryHigh);Usage
By default the SDMMC bus clock is derived from the pll1_q_ck. This can be
set when initialising the RCC.
let ccdr = rcc
.pll1_q_ck(100.mhz())
.freeze(pwrcfg, &dp.SYSCFG);There is an extension trait implemented for the
SDMMC1 and SDMMC2 peripherals for easy initialisation.
// 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.
if let Err(err) = sdmmc.init_card(10.mhz()) {
info!("Init err: {:?}", err);
}The card() method returns useful information about
the card.
let card = sdmmc.card();
if let Some(card) = sdmmc.card() {
info!("SD Card Connected: {:?}", card);
}Structs
Enums
Errors
The signalling scheme used on the SDMMC bus