From 46f671ae420f27b527edf03756d1da76d86216c7 Mon Sep 17 00:00:00 2001
From: Dario Nieuwenhuis <dirbaio@dirbaio.net>
Date: Tue, 15 Aug 2023 22:47:03 +0200
Subject: [PATCH] rp: fix async spi read sometimes hanging.

---
 embassy-rp/src/dma.rs | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/embassy-rp/src/dma.rs b/embassy-rp/src/dma.rs
index c8f74180..45ca21a7 100644
--- a/embassy-rp/src/dma.rs
+++ b/embassy-rp/src/dma.rs
@@ -76,7 +76,8 @@ pub unsafe fn write<'a, C: Channel, W: Word>(
     )
 }
 
-static DUMMY: u32 = 0;
+// static mut so that this is allocated in RAM.
+static mut DUMMY: u32 = 0;
 
 pub unsafe fn write_repeated<'a, C: Channel, W: Word>(
     ch: impl Peripheral<P = C> + 'a,
@@ -86,7 +87,7 @@ pub unsafe fn write_repeated<'a, C: Channel, W: Word>(
 ) -> Transfer<'a, C> {
     copy_inner(
         ch,
-        &DUMMY as *const u32,
+        &mut DUMMY as *const u32,
         to as *mut u32,
         len,
         W::size(),