From 50fe8e51f9dfb610e74049fcc0db440e22301d54 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Mon, 9 Feb 2026 12:07:28 -0600
Subject: [PATCH] [ld2412] Batch UART reads to reduce loop overhead (#13819)

---
 esphome/components/ld2412/ld2412.cpp | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/esphome/components/ld2412/ld2412.cpp b/esphome/components/ld2412/ld2412.cpp
index c2f441e472..f8ceee78eb 100644
--- a/esphome/components/ld2412/ld2412.cpp
+++ b/esphome/components/ld2412/ld2412.cpp
@@ -310,8 +310,19 @@ void LD2412Component::restart_and_read_all_info() {
 }
 
 void LD2412Component::loop() {
-  while (this->available()) {
-    this->readline_(this->read());
+  // Read all available bytes in batches to reduce UART call overhead.
+  int avail = this->available();
+  uint8_t buf[MAX_LINE_LENGTH];
+  while (avail > 0) {
+    size_t to_read = std::min(static_cast<size_t>(avail), sizeof(buf));
+    if (!this->read_array(buf, to_read)) {
+      break;
+    }
+    avail -= to_read;
+
+    for (size_t i = 0; i < to_read; i++) {
+      this->readline_(buf[i]);
+    }
   }
 }