From 07828247b6909a474b38430c82bde74710829e48 Mon Sep 17 00:00:00 2001
From: Lorenzo Flueckiger <Lorenzo.Flueckiger@gmail.com>
Date: Sun, 20 Mar 2022 15:06:18 -0700
Subject: [PATCH 1/2] Added method to put the backpack in standby mode for low
 power applications

---
 Adafruit_LEDBackpack.cpp | 10 ++++++++++
 Adafruit_LEDBackpack.h   |  5 +++++
 2 files changed, 15 insertions(+)

diff --git a/Adafruit_LEDBackpack.cpp b/Adafruit_LEDBackpack.cpp
index 6a39595..1e607d2 100644
--- a/Adafruit_LEDBackpack.cpp
+++ b/Adafruit_LEDBackpack.cpp
@@ -322,6 +322,16 @@ void Adafruit_LEDBackpack::clear(void) {
   }
 }
 
+void Adafruit_LEDBackpack::end() {
+  if (i2c_dev) {
+    // turn off oscillator
+    uint8_t buffer[1] = {0x20};
+    i2c_dev->write(buffer, 1);
+    // terminate I2C communication
+    i2c_dev->end();
+  }
+}
+
 /******************************* QUAD ALPHANUM OBJECT */
 
 Adafruit_AlphaNum4::Adafruit_AlphaNum4(void) {}
diff --git a/Adafruit_LEDBackpack.h b/Adafruit_LEDBackpack.h
index b34ae15..946c78d 100644
--- a/Adafruit_LEDBackpack.h
+++ b/Adafruit_LEDBackpack.h
@@ -97,6 +97,11 @@ class Adafruit_LEDBackpack {
   */
   void clear(void);
 
+  /*!
+    @brief Put HT16K33 in standby mode.
+  */
+  void end(void);
+
   uint16_t displaybuffer[8]; ///< Raw display data
 
 protected:

From dbbb0c4ad4d565739dc1859b74515ec9e28ffeb5 Mon Sep 17 00:00:00 2001
From: Lorenzo Flueckiger <Lorenzo.Flueckiger@gmail.com>
Date: Sun, 20 Mar 2022 15:56:05 -0700
Subject: [PATCH 2/2] do not terminate i2c comms (in case more than device is
 on the bus)

---
 Adafruit_LEDBackpack.cpp | 2 --
 1 file changed, 2 deletions(-)

diff --git a/Adafruit_LEDBackpack.cpp b/Adafruit_LEDBackpack.cpp
index 1e607d2..2ab5b03 100644
--- a/Adafruit_LEDBackpack.cpp
+++ b/Adafruit_LEDBackpack.cpp
@@ -327,8 +327,6 @@ void Adafruit_LEDBackpack::end() {
     // turn off oscillator
     uint8_t buffer[1] = {0x20};
     i2c_dev->write(buffer, 1);
-    // terminate I2C communication
-    i2c_dev->end();
   }
 }