From 0ae1834320ee5d48c50310e4f5895e3fede11dfa Mon Sep 17 00:00:00 2001
From: 94xhn <87560781+94xhn@users.noreply.github.com>
Date: Mon, 13 Jul 2026 13:23:14 +0800
Subject: [PATCH] Fix: implement missing
 saveScratchPadByIndex/recallScratchPadByIndex

DallasTemperature.h declares saveScratchPadByIndex() and
recallScratchPadByIndex(), and both are documented and used in the
SaveRecallScratchPad example, but their implementations were dropped
from DallasTemperature.cpp during the race-condition refactor merged
in #264. Any sketch calling either method now fails at link time with
"undefined reference to DallasTemperature::saveScratchPadByIndex(...)"
(and the recall counterpart).

Restore the two thin wrapper functions that resolve a device index to
its address via getAddress() and delegate to the existing
saveScratchPad()/recallScratchPad() overloads, matching their
pre-refactor behavior.
---
 DallasTemperature.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/DallasTemperature.cpp b/DallasTemperature.cpp
index 29b7bc5..15417e2 100644
--- a/DallasTemperature.cpp
+++ b/DallasTemperature.cpp
@@ -237,6 +237,18 @@ void DallasTemperature::writeScratchPad(const uint8_t* deviceAddress, const uint
     }
 }
 
+bool DallasTemperature::saveScratchPadByIndex(uint8_t deviceIndex) {
+    DeviceAddress deviceAddress;
+    if (!getAddress(deviceAddress, deviceIndex)) return false;
+    return saveScratchPad(deviceAddress);
+}
+
+bool DallasTemperature::recallScratchPadByIndex(uint8_t deviceIndex) {
+    DeviceAddress deviceAddress;
+    if (!getAddress(deviceAddress, deviceIndex)) return false;
+    return recallScratchPad(deviceAddress);
+}
+
 bool DallasTemperature::saveScratchPad(const uint8_t* deviceAddress) {
     if (_wire->reset() == 0) return false;