From 0d2051243ef62aac7210dd68c7569912fa315fb2 Mon Sep 17 00:00:00 2001
From: Bob McWhirter <bmcwhirt@redhat.com>
Date: Wed, 21 Jul 2021 10:42:22 -0400
Subject: SPIv2 + DMA.

---
 examples/stm32l4/src/bin/spi.rs     |   3 ++
 examples/stm32l4/src/bin/spi_dma.rs | 103 ++++++++++++++++++++++++++++++++++++
 2 files changed, 106 insertions(+)
 create mode 100644 examples/stm32l4/src/bin/spi_dma.rs

(limited to 'examples')

diff --git a/examples/stm32l4/src/bin/spi.rs b/examples/stm32l4/src/bin/spi.rs
index 8702fe0cc..14605283b 100644
--- a/examples/stm32l4/src/bin/spi.rs
+++ b/examples/stm32l4/src/bin/spi.rs
@@ -17,6 +17,7 @@ use embassy_stm32::time::Hertz;
 use embedded_hal::blocking::spi::Transfer;
 use embedded_hal::digital::v2::OutputPin;
 use example_common::*;
+use embassy_stm32::dma::NoDma;
 
 #[entry]
 fn main() -> ! {
@@ -41,6 +42,8 @@ fn main() -> ! {
         p.PC10,
         p.PC12,
         p.PC11,
+        NoDma,
+        NoDma,
         Hertz(1_000_000),
         Config::default(),
     );
diff --git a/examples/stm32l4/src/bin/spi_dma.rs b/examples/stm32l4/src/bin/spi_dma.rs
new file mode 100644
index 000000000..ca77c2f9b
--- /dev/null
+++ b/examples/stm32l4/src/bin/spi_dma.rs
@@ -0,0 +1,103 @@
+#![no_std]
+#![no_main]
+#![feature(trait_alias)]
+#![feature(min_type_alias_impl_trait)]
+#![feature(impl_trait_in_bindings)]
+#![feature(type_alias_impl_trait)]
+#![allow(incomplete_features)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+
+use cortex_m_rt::entry;
+use embassy::executor::Executor;
+use embassy::time::Clock;
+use embassy::util::Forever;
+use embassy_stm32::pac;
+use example_common::*;
+use embassy_stm32::spi::{Spi, Config};
+use embassy_traits::spi::FullDuplex;
+use embassy_stm32::time::Hertz;
+use embassy_stm32::gpio::{Output, Level, Speed};
+use embedded_hal::digital::v2::OutputPin;
+
+#[embassy::task]
+async fn main_task() {
+    let p = embassy_stm32::init(Default::default());
+
+    let mut spi = Spi::new(
+        p.SPI3,
+        p.PC10,
+        p.PC12,
+        p.PC11,
+        p.DMA1_CH0,
+        p.DMA1_CH1,
+        Hertz(1_000_000),
+        Config::default(),
+    );
+
+    let mut cs = Output::new(p.PE0, Level::High, Speed::VeryHigh);
+
+    loop {
+        let write = [0x0A; 10];
+        let mut read = [0; 10];
+        unwrap!(cs.set_low());
+        spi.read_write(&mut read, &write).await.ok();
+        unwrap!(cs.set_high());
+        info!("xfer {=[u8]:x}", read);
+    }
+}
+
+struct ZeroClock;
+
+impl Clock for ZeroClock {
+    fn now(&self) -> u64 {
+        0
+    }
+}
+
+static EXECUTOR: Forever<Executor> = Forever::new();
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    unsafe {
+        pac::DBGMCU.cr().modify(|w| {
+            w.set_dbg_sleep(true);
+            w.set_dbg_standby(true);
+            w.set_dbg_stop(true);
+        });
+
+        //pac::RCC.apbenr().modify(|w| {
+        //w.set_spi3en(true);
+        // });
+
+        pac::RCC.apb2enr().modify(|w| {
+            w.set_syscfgen(true);
+        });
+
+        pac::RCC.ahb1enr().modify(|w| {
+            w.set_dmamux1en(true);
+            w.set_dma1en(true);
+            w.set_dma2en(true);
+        });
+
+        pac::RCC.ahb2enr().modify(|w| {
+            w.set_gpioaen(true);
+            w.set_gpioben(true);
+            w.set_gpiocen(true);
+            w.set_gpioden(true);
+            w.set_gpioeen(true);
+            w.set_gpiofen(true);
+        });
+    }
+
+    unsafe { embassy::time::set_clock(&ZeroClock) };
+
+    let executor = EXECUTOR.put(Executor::new());
+
+    executor.run(|spawner| {
+        unwrap!(spawner.spawn(main_task()));
+    })
+}
-- 
cgit