stm32/usart: Data length is including parity. To get e.g. 8E1 you need to choose 9 data bits

1 files changed, 5 insertions, 1 deletions

diff --git a/embassy-stm32/src/usart/mod.rs b/embassy-stm32/src/usart/mod.rs
index 6feecd184..472680113 100644
--- a/embassy-stm32/src/usart/mod.rs
+++ b/embassy-stm32/src/usart/mod.rs
@@ -219,7 +219,11 @@ impl<'d, T: Instance, TxDma, RxDma> Uart<'d, T, TxDma, RxDma> {
                 w.set_ue(true);
                 w.set_te(true);
                 w.set_re(true);
-                w.set_m0(vals::M0::BIT8);
+                w.set_m0(if config.parity != Parity::ParityNone {
+                    vals::M0::BIT9
+                } else {
+                    vals::M0::BIT8
+                });
                 w.set_pce(config.parity != Parity::ParityNone);
                 w.set_ps(match config.parity {
                     Parity::ParityOdd => vals::Ps::ODD,