Fix I2C read for ESP32-S2 (#1214)

* Fix I2C read for ESP32-S2 * CHANGELOG.md entry
esp-rs · Feb 28, 2024 · 76135cf · 76135cf
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -39,6 +39,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix I2C error handling (#1184)
 - Fix circular DMA (#1189)
 - Fix esp32c3 uart initialization (#1156)
+- Fix ESP32-S2 I2C read (#1214)
 
 ### Changed
 

diff --git a/esp-hal/src/i2c.rs b/esp-hal/src/i2c.rs
@@ -1566,7 +1566,7 @@ fn read_fifo(register_block: &RegisterBlock) -> u8 {
     } else {
         0x6002701c
     }) as *mut u32;
-    unsafe { (fifo_ptr.read() & 0xff) as u8 }
+    unsafe { (fifo_ptr.read_volatile() & 0xff) as u8 }
 }
 
 #[cfg(esp32)]