Module stm32f1xx_hal::spi

Expand description

Serial Peripheral Interface

To construct the SPI instances, use the Spi::spiX functions.

The pin parameter is a tuple containing (sck, miso, mosi) which should be configured as (Alternate<...>, Input<...>, Alternate<...>). As some STM32F1xx chips have 5V tolerant SPI pins, it is also possible to configure Sck and Mosi outputs as Alternate<PushPull>. Then a simple Pull-Up to 5V can be used to use SPI on a 5V bus without a level shifter.

You can also use NoSck, NoMiso or NoMosi if you don’t want to use the pins

SPI1 can use (PA5, PA6, PA7) or (PB3, PB4, PB5).
SPI2 can use (PB13, PB14, PB15)
SPI3 can use (PB3, PB4, PB5) or only in connectivity line devices (PC10, PC11, PC12)

Initialisation example

  // Acquire the GPIOB peripheral
  let mut gpiob = dp.GPIOB.split();

  let pins = (
      gpiob.pb13.into_alternate_push_pull(&mut gpiob.crh),
      gpiob.pb14.into_floating_input(&mut gpiob.crh),
      gpiob.pb15.into_alternate_push_pull(&mut gpiob.crh),
  );

  let spi_mode = Mode {
      polarity: Polarity::IdleLow,
      phase: Phase::CaptureOnFirstTransition,
  };
  let spi = Spi::spi2(dp.SPI2, pins, spi_mode, 100.khz(), clocks);