spi_slave example

CHANGELOG.md

@@ -7,7 +7,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
- - Split USART and UART implementations
+ - Split SPI master and slave implementations [#609]
+ - Split USART and UART implementations [#608]
  - Add `lapce` editor settings [#601]
  - Use `enum`s for alternate peripheral pins [#594]
  - Added missing U(S)ART DMA traits for HAL serial types [#593]
@@ -25,6 +26,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 [#599]: https://github.com/stm32-rs/stm32f4xx-hal/pull/599
 [#601]: https://github.com/stm32-rs/stm32f4xx-hal/pull/601
 [#603]: https://github.com/stm32-rs/stm32f4xx-hal/pull/603
+[#608]: https://github.com/stm32-rs/stm32f4xx-hal/pull/608
+[#609]: https://github.com/stm32-rs/stm32f4xx-hal/pull/609
 
 ## [v0.15.0] - 2023-03-13
 

examples/spi_slave.rs

@@ -0,0 +1,50 @@
+#![no_main]
+#![no_std]
+
+use panic_halt as _;
+
+use crate::hal::spi::{Mode, Phase, Polarity};
+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 = p
+        .SPI1
+        .spi_slave((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;
+    }
+}

src/gpio/alt.rs

@@ -424,21 +424,7 @@ pub mod spi1 {
         ],
 
         <Nss> for [
-            #[cfg(any(
-                feature = "gpio-f410",
-                feature = "gpio-f411",
-                feature = "gpio-f412",
-                feature = "gpio-f413",
-                feature = "gpio-f446"
-            ))]
             PA4<5>,
-            #[cfg(any(
-                feature = "gpio-f410",
-                feature = "gpio-f411",
-                feature = "gpio-f412",
-                feature = "gpio-f413",
-                feature = "gpio-f446"
-            ))]
             PA15<5>,
         ],
     }