From 1a03f00b56061dbef8a3aae6e499e5e635b3fd4d Mon Sep 17 00:00:00 2001
From: Bob McWhirter <bmcwhirt@redhat.com>
Date: Tue, 20 Jul 2021 15:44:13 -0400
Subject: [PATCH] Wire up peripheral DMA channels for SPI.

---
 embassy-stm32/src/spi/mod.rs | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/embassy-stm32/src/spi/mod.rs b/embassy-stm32/src/spi/mod.rs
index 7e168644..9bb5a729 100644
--- a/embassy-stm32/src/spi/mod.rs
+++ b/embassy-stm32/src/spi/mod.rs
@@ -116,3 +116,39 @@ crate::pac::peripheral_pins!(
         impl_pin!($inst, $pin, MisoPin, $af);
     };
 );
+
+macro_rules! impl_dma {
+    ($inst:ident, {dmamux: $dmamux:ident}, $signal:ident, $request:expr) => {
+        impl<T> sealed::$signal<peripherals::$inst> for T
+        where
+            T: crate::dma::MuxChannel<Mux = crate::dma::$dmamux>,
+        {
+            fn request(&self) -> dma::Request {
+                $request
+            }
+        }
+
+        impl<T> $signal<peripherals::$inst> for T where
+            T: crate::dma::MuxChannel<Mux = crate::dma::$dmamux>
+        {
+        }
+    };
+    ($inst:ident, {channel: $channel:ident}, $signal:ident, $request:expr) => {
+        impl sealed::$signal<peripherals::$inst> for peripherals::$channel {
+            fn request(&self) -> dma::Request {
+                $request
+            }
+        }
+
+        impl $signal<peripherals::$inst> for peripherals::$channel {}
+    };
+}
+
+crate::pac::peripheral_dma_channels! {
+    ($peri:ident, spi, $kind:ident, RX, $channel:tt, $request:expr) => {
+        impl_dma!($peri, $channel, RxDmaChannel, $request);
+    };
+    ($peri:ident, spi, $kind:ident, TX, $channel:tt, $request:expr) => {
+        impl_dma!($peri, $channel, TxDmaChannel, $request);
+    };
+}