allow again to set nodiv independently of master clock divider

4 files changed, 8 insertions, 6 deletions

diff --git a/embassy-stm32/CHANGELOG.md b/embassy-stm32/CHANGELOG.md
index ac228141e..449152485 100644
--- a/embassy-stm32/CHANGELOG.md
+++ b/embassy-stm32/CHANGELOG.md
@@ -91,6 +91,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - feat: stm32/spi bidirectional mode 
 - fix: stm32/i2c v2: add stop flag on stop received
 - fix: stm32l47*/stm32l48* adc analog pin setup
+- fix: keep stm32/sai: make NODIV independent of MCKDIV
 
 ## 0.4.0 - 2025-08-26
 
diff --git a/embassy-stm32/src/sai/mod.rs b/embassy-stm32/src/sai/mod.rs
index ce4bc43c3..579c34c13 100644
--- a/embassy-stm32/src/sai/mod.rs
+++ b/embassy-stm32/src/sai/mod.rs
@@ -394,7 +394,8 @@ pub struct Config {
     pub frame_length: u16,
     pub clock_strobe: ClockStrobe,
     pub output_drive: OutputDrive,
-    pub master_clock_divider: Option<MasterClockDivider>,
+    pub master_clock_divider: MasterClockDivider,
+    pub nodiv: bool,
     pub is_high_impedance_on_inactive_slot: bool,
     pub fifo_threshold: FifoThreshold,
     pub companding: Companding,
@@ -423,7 +424,8 @@ impl Default for Config {
             frame_sync_active_level_length: word::U7(16),
             frame_sync_definition: FrameSyncDefinition::ChannelIdentification,
             frame_length: 32,
-            master_clock_divider: None,
+            master_clock_divider: MasterClockDivider::DIV1,
+            nodiv: false,
             clock_strobe: ClockStrobe::Rising,
             output_drive: OutputDrive::Immediately,
             is_high_impedance_on_inactive_slot: false,
@@ -677,8 +679,8 @@ impl<'d, T: Instance, W: word::Word> Sai<'d, T, W> {
             w.set_syncen(config.sync_input.syncen());
             w.set_mono(config.stereo_mono.mono());
             w.set_outdriv(config.output_drive.outdriv());
-            w.set_mckdiv(config.master_clock_divider.unwrap_or(MasterClockDivider::DIV1));
-            w.set_nodiv(config.master_clock_divider.is_none());
+            w.set_mckdiv(config.master_clock_divider);
+            w.set_nodiv(config.nodiv);
             w.set_dmaen(true);
         });
 
diff --git a/examples/stm32h7/src/bin/sai.rs b/examples/stm32h7/src/bin/sai.rs
index 847b70c85..0300f83bf 100644
--- a/examples/stm32h7/src/bin/sai.rs
+++ b/examples/stm32h7/src/bin/sai.rs
@@ -63,7 +63,7 @@ async fn main(_spawner: Spawner) {
     tx_config.tx_rx = TxRx::Transmitter;
     tx_config.sync_output = true;
     tx_config.clock_strobe = ClockStrobe::Falling;
-    tx_config.master_clock_divider = Some(mclk_div);
+    tx_config.master_clock_divider = mclk_div;
     tx_config.stereo_mono = StereoMono::Stereo;
     tx_config.data_size = DataSize::Data24;
     tx_config.bit_order = BitOrder::MsbFirst;
diff --git a/examples/stm32h723/src/bin/spdifrx.rs b/examples/stm32h723/src/bin/spdifrx.rs
index 5c29602c6..959e2aa18 100644
--- a/examples/stm32h723/src/bin/spdifrx.rs
+++ b/examples/stm32h723/src/bin/spdifrx.rs
@@ -168,7 +168,6 @@ fn new_sai_transmitter<'d>(
     sai_config.slot_enable = 0xFFFF; // All slots
     sai_config.data_size = sai::DataSize::Data32;
     sai_config.frame_length = (CHANNEL_COUNT * 32) as u16;
-    sai_config.master_clock_divider = None;
 
     let (sub_block_tx, _) = hal::sai::split_subblocks(sai);
     Sai::new_asynchronous(sub_block_tx, sck, sd, fs, dma, buf, sai_config)