From 46ea0a079e104b5718ea3b7d4196d9fbb8751759 Mon Sep 17 00:00:00 2001
From: liebman <liebman@zod.com>
Date: Fri, 30 Aug 2024 14:11:52 -0700
Subject: [PATCH] handle write_read when the read bufer is empty

---
 esp-hal/src/i2c.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/esp-hal/src/i2c.rs b/esp-hal/src/i2c.rs
index c154fa2c16..396a94baf0 100644
--- 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,