From 2457d6ee51e73f1659b1e30f911a0c592c74d6be Mon Sep 17 00:00:00 2001
From: Fisch <interfisch@gmx.net>
Date: Fri, 5 Mar 2021 20:11:19 +0100
Subject: [PATCH] more efficient display update

---
 src/main.cpp | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index ed57062..bc07059 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -28,7 +28,9 @@ uint8_t display_data[] = { 0xff, 0xff, 0xff, 0xff };
 uint8_t display_blank[] = { 0x00, 0x00, 0x00, 0x00 };
 
 unsigned long last_displayupdate=0;
-#define DISPLAYUPDATEINTERVAL 100
+#define DISPLAYUPDATEINTERVAL 100 //maximum time to update display
+#define DISPLAYUPDATEINTERVAL_MIN 10 //minimum display update time
+bool update_display=true;
 
 
 #include "HX711.h"
@@ -162,6 +164,7 @@ void loopHandler() {
     if (spread<MAXSPREAD_TARE) { //if reading is stable
       if (weight_filtered<weight_tare) { //new min
         weight_tare=weight_filtered; 
+        update_display=true;
         Serial.print("new tare="); Serial.println(weight_tare,3);
       }
     }
@@ -169,6 +172,7 @@ void loopHandler() {
     if (spread<MAXSPREAD_MEASURE) { //if reading is stable
       if (weight_filtered>weight_max) { //new max
         weight_max=weight_filtered; 
+        update_display=true;
         Serial.print("new max="); Serial.println(weight_max,3);
       }
     }
@@ -177,6 +181,7 @@ void loopHandler() {
     if (!weight_sent) {
       if (weight_max-weight_tare>MIN_WEIGHT_DIFFERENCE) {
         sendWeight(weight_max-weight_tare);
+        update_display=true;
       }
     }
   }
@@ -206,8 +211,9 @@ void loopHandler() {
     powerOff();
   }
 
-  if (loopmillis > last_displayupdate + DISPLAYUPDATEINTERVAL) {
+  if ( (loopmillis > last_displayupdate + DISPLAYUPDATEINTERVAL) | (update_display && (loopmillis > last_displayupdate + DISPLAYUPDATEINTERVAL_MIN) )) {
     last_displayupdate=loopmillis;
+    update_display=false; //reset flag
     displayNumber(weight_current);    
   }