stm32/spi: add blocking rxonly test.

tests/stm32/src/bin/spi.rs

@@ -6,6 +6,7 @@ mod common;
 use common::*;
 use defmt::assert_eq;
 use embassy_executor::Spawner;
+use embassy_stm32::gpio::{Level, Output, Speed};
 use embassy_stm32::spi::{self, Spi};
 use embassy_stm32::time::Hertz;
 
@@ -14,18 +15,19 @@ async fn main(_spawner: Spawner) {
     let p = embassy_stm32::init(config());
     info!("Hello World!");
 
-    let spi = peri!(p, SPI);
+    let mut spi_peri = peri!(p, SPI);
-    let sck = peri!(p, SPI_SCK);
+    let mut sck = peri!(p, SPI_SCK);
-    let mosi = peri!(p, SPI_MOSI);
+    let mut mosi = peri!(p, SPI_MOSI);
-    let miso = peri!(p, SPI_MISO);
+    let mut miso = peri!(p, SPI_MISO);
 
     let mut spi_config = spi::Config::default();
     spi_config.frequency = Hertz(1_000_000);
 
     let mut spi = Spi::new_blocking(
-        spi, sck,  // Arduino D13
+        &mut spi_peri,
-        mosi, // Arduino D11
+        &mut sck,  // Arduino D13
-        miso, // Arduino D12
+        &mut mosi, // Arduino D11
+        &mut miso, // Arduino D12
         spi_config,
     );
 
@@ -66,6 +68,22 @@ async fn main(_spawner: Spawner) {
         defmt::assert!(!embassy_stm32::pac::RCC.apb2enr().read().spi1en());
     }
 
+    #[cfg(not(feature = "stm32f429zi"))]
+    core::mem::drop(spi);
+
+    // test rx-only configuration
+    let mut spi = Spi::new_blocking_rxonly(&mut spi_peri, &mut sck, &mut miso, spi_config);
+
+    let mut mosi = Output::new(&mut mosi, Level::Low, Speed::VeryHigh);
+
+    mosi.set_high();
+    spi.blocking_read(&mut buf).unwrap();
+    assert_eq!(buf, [0xff; 9]);
+
+    mosi.set_low();
+    spi.blocking_read(&mut buf).unwrap();
+    assert_eq!(buf, [0x00; 9]);
+
     info!("Test OK");
     cortex_m::asm::bkpt();
 }