wip(spi): add bug demo

examples/hpm5300evk/src/bin/async_spi_bug.rs

@@ -0,0 +1,50 @@
+#![no_main]
+#![no_std]
+#![feature(type_alias_impl_trait)]
+#![feature(impl_trait_in_assoc_type)]
+#![feature(abi_riscv_interrupt)]
+
+use embassy_time::{Duration, Timer};
+use hal::gpio::{Level, Output};
+use hal::peripherals;
+use hpm_hal::bind_interrupts;
+use hpm_hal::time::Hertz;
+use {defmt_rtt as _, hpm_hal as hal};
+
+bind_interrupts!(struct Irqs {
+    SPI1 => hal::spi::InterruptHandler<peripherals::SPI1>;
+});
+
+#[embassy_executor::main(entry = "hpm_hal::entry")]
+async fn main(_spawner: embassy_executor::Spawner) -> ! {
+    let config = hal::Config::default();
+    let p = hal::init(config);
+
+    let mut config = hal::spi::Config::default();
+    config.frequency = Hertz::mhz(2);
+    let mut spi = hal::spi::Spi::new_txonly(p.SPI1, p.PA27, p.PA29, Irqs, p.HDMA_CH0, config);
+
+    defmt::info!("go !");
+
+    spi.write(&[0xaa_u8; 1]).await.unwrap(); // lower values fail. larger(10 or so) values work
+
+    // The following lines are never reached
+
+    defmt::println!("bytes sent");
+
+    let mut led = Output::new(p.PA23, Level::Low, Default::default());
+    loop {
+        led.set_high();
+        Timer::after(Duration::from_millis(500)).await;
+        led.set_low();
+        Timer::after(Duration::from_millis(500)).await;
+        defmt::println!("tick");
+    }
+}
+
+#[panic_handler]
+unsafe fn panic(info: &core::panic::PanicInfo) -> ! {
+    defmt::println!("panic!\n {}", defmt::Debug2Format(info));
+
+    loop {}
+}

src/spi/mod.rs

@@ -56,8 +56,6 @@ impl<T: Instance> interrupt::typelevel::Handler<T::Interrupt> for InterruptHandl
 unsafe fn on_interrupt(r: pac::spi::Spi, s: &'static State) {
     let status = r.intr_st().read();
 
-    defmt::println!("in irq");
-
     if status.endint() {
         s.waker.wake();