handle write_read when the read bufer is empty

esp-rs · Aug 30, 2024 · 46ea0a0 · 46ea0a0
1 parent 9023195
commit 46ea0a0
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/esp-hal/src/i2c.rs b/esp-hal/src/i2c.rs
@@ -926,11 +926,13 @@ mod asynch {
                 addr,
                 bytes,
                 true,
-                false,
+                buffer.is_empty(), // if the read buffer is empty, then issue a stop
                 &mut self.peripheral.register_block().comd_iter(),
             )
             .await?;
             self.peripheral.clear_all_interrupts();
+            // this will be a no-op if the buffer is empty, in that case we issued the stop
+            // with the write
             self.read_operation(
                 addr,
                 buffer,
@@ -2142,10 +2144,12 @@ pub trait Instance: crate::private::Sealed {
             addr,
             bytes,
             true,
-            false,
+            buffer.is_empty(), // if the read buffer is empty, then issue a stop
             &mut self.register_block().comd_iter(),
         )?;
         self.clear_all_interrupts();
+        // this will be a no-op if the buffer is empty, in that case we issued the stop
+        // with the write
         self.read_operation(
             addr,
             buffer,