Module esp32c2_hal::spi

Serial Peripheral Interface

There are multiple ways to use SPI, depending on your needs. Regardless of which way you choose, you must first create an SPI instance with Spi::new.

let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
let sclk = io.pins.gpio12;
let miso = io.pins.gpio11;
let mosi = io.pins.gpio13;
let cs = io.pins.gpio10;

let mut spi = hal::spi::Spi::new(
    peripherals.SPI2,
    sclk,
    mosi,
    miso,
    cs,
    100u32.kHz(),
    SpiMode::Mode0,
    &mut peripheral_clock_control,
    &mut clocks,
);

Exclusive access to the SPI bus

If all you want to do is to communicate to a single device, and you initiate transactions yourself, there are a number of ways to achieve this:

• Use the FullDuplex trait to read/write single bytes at a time,
• Use the SpiBus trait (requires the “eh1” feature) and its associated functions to initiate transactions with simultaneous reads and writes, or
• Use the SpiBusWrite and SpiBusRead traits (requires the “eh1” feature) and their associated functions to read or write mutiple bytes at a time.

Shared SPI access

If you have multiple devices on the same SPI bus that each have their own CS line, you may want to have a look at the [SpiBusController] and [SpiBusDevice] implemented here. These give exclusive access to the underlying SPI bus by means of a Mutex. This ensures that device transactions do not interfere with each other.

Modules

dma

Structs

Spi

Enums

Error

SpiMode

Traits

Instance

InstanceDma

Spi2Instance