spi_slave example

examples/spi_slave.rs

@@ -0,0 +1,48 @@
+#![no_main]
+#![no_std]
+
+use panic_halt as _;
+
+use crate::hal::spi::{Mode, Phase, Polarity, SpiSlave};
+use crate::hal::{pac, prelude::*};
+use cortex_m::asm;
+use cortex_m_rt::entry;
+use stm32f4xx_hal as hal;
+
+/// SPI mode
+pub const MODE: Mode = Mode {
+ phase: Phase::CaptureOnFirstTransition,
+ polarity: Polarity::IdleLow,
+};
+
+#[entry]
+fn main() -> ! {
+ let p = pac::Peripherals::take().unwrap();
+
+ let rcc = p.RCC.constrain();
+ let _clocks = rcc.cfgr.freeze();
+
+ let gpioa = p.GPIOA.split();
+
+ let sck = gpioa.pa5;
+ let miso = gpioa.pa6;
+ let mosi = gpioa.pa7;
+
+ // clock speed is determined by the master
+ let mut spi = SpiSlave::new(p.SPI1, (sck, miso, mosi, Some(gpioa.pa4.into())), MODE);
+ // alternativelly you could use software `chip select`
+ // let mut spi = SpiSlave::new(p.SPI1, (sck, miso, mosi, None), MODE);
+ // spi.set_internal_nss(false);
+
+ let mut data = [0x1];
+ // this will block until the master starts the clock
+ spi.transfer_in_place(&mut data).unwrap();
+
+ // when you reach this breakpoint you'll be able to inspect the variable `data` which contains the
+ // data sent by the master
+ asm::bkpt();
+
+ loop {
+ continue;
+ }
+}