ESP32/S2: I2S wait for TX start (#1375)

* ESP32/S2: I2S wait for TX start

* CHANGELOG.md

esp-hal/CHANGELOG.md

@@ -28,6 +28,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - The TWAI driver can now be used without requiring the `embedded-hal` traits (#1355)
 - USB pullup/pulldown now gets properly cleared and does not interfere anymore on esp32c3 and esp32s3 (#1244)
 - Fixed GPIO counts so that using async code with the higher GPIO number should no longer panic (#1361, #1362)
+- ESP32/ESP32-S2: Wait for I2S getting out of TX_IDLE when starting a transfer (#1375)
 
 ### Changed
 

esp-hal/src/i2s.rs

@@ -1293,6 +1293,10 @@ mod private {
         fn tx_start() {
             let i2s = Self::register_block();
             i2s.conf().modify(|_, w| w.tx_start().set_bit());
+
+            while i2s.state().read().tx_idle().bit_is_set() {
+                // wait
+            }
         }
 
         fn tx_stop() {