Merge pull request #524 from lulf/readd-write-flush

Add back MISO flush

2 files changed, 10 insertions, 0 deletions

diff --git a/embassy-stm32/src/spi/v2.rs b/embassy-stm32/src/spi/v2.rs
index de78676c2..e24710dfe 100644
--- a/embassy-stm32/src/spi/v2.rs
+++ b/embassy-stm32/src/spi/v2.rs
@@ -14,6 +14,11 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
             T::regs().cr1().modify(|w| {
                 w.set_spe(false);
             });
+
+            // Flush the read buffer to avoid errornous data from being read
+            while T::regs().sr().read().rxne() {
+                let _ = T::regs().dr().read();
+            }
         }
         self.set_word_size(WordSize::EightBit);
 
diff --git a/embassy-stm32/src/spi/v3.rs b/embassy-stm32/src/spi/v3.rs
index ef0f23063..6d75de035 100644
--- a/embassy-stm32/src/spi/v3.rs
+++ b/embassy-stm32/src/spi/v3.rs
@@ -15,6 +15,11 @@ impl<'d, T: Instance, Tx, Rx> Spi<'d, T, Tx, Rx> {
             T::regs().cr1().modify(|w| {
                 w.set_spe(false);
             });
+
+            // Flush the read buffer to avoid errornous data from being read
+            while T::regs().sr().read().rxp() {
+                let _ = T::regs().rxdr().read();
+            }
         }
 
         let request = self.txdma.request();