From d1195efb8277bc3367adb3825fc7c122b39bb987 Mon Sep 17 00:00:00 2001
From: Stefan Brand <seiichiro@seiichiro0185.org>
Date: Sun, 20 Jun 2021 18:42:26 +0200
Subject: [PATCH] Fill Display Lines to Avoid Artifacts

---
 src/main.cpp | 42 ++++++++++++++++++++++++++++++------------
 1 file changed, 30 insertions(+), 12 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index fe9575f..5851e61 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -84,6 +84,12 @@ void loraKeySetup(uint8_t keyset) {
     lora.setKeys(NwkSkey_2, AppSkey_2, DevAddr_2);
 }
 
+void fillLine() {
+  for (uint8_t i = oled.tx; i<15; i++)
+    oled.print(" ");
+  oled.println("");
+}
+
 // Button Handler Function
 void handler(Button2& btn) {
   switch (btn.getClickType()) {
@@ -198,37 +204,49 @@ void updateDisplay() {
         oldFix = hasFix;
       }
       oled.print("HDOP:   ");
-      oled.println(buffer[0]);
+      oled.print(buffer[0]);
+      fillLine();
       oled.print("Sats:   ");
       oled.print(buffer[1]);
       oled.print("/");
-      oled.println(buffer[2]);
+      oled.print(buffer[2]);
+      fillLine();
       oled.print("Int:    ");
-      oled.println(interval);
+      oled.print(interval);
+      fillLine();
       oled.print("Packet: ");
-      oled.println(packets);
+      oled.print(packets);
+      fillLine();
       oled.print("Alt:    ");
-      oled.println(buffer[3]);
+      oled.print(buffer[3]);
+      fillLine();
       oled.print("Speed:  ");
-      oled.println(buffer[4]);
+      oled.print(buffer[4]);
+      fillLine();
       oled.print("Bat:    ");
-      oled.println((float)readSupplyVoltage()/1000);
+      oled.print((float)readSupplyVoltage()/1000);
+      fillLine();
     } else {
       if (hasFix != oldFix){
         oled.clear();
         oldFix = hasFix;
       }
-      oled.println("NO GPS FIX");
+      oled.print("NO GPS FIX");
+      fillLine();
       oled.print("Sats:   ");
       oled.print(buffer[1]);
       oled.print("/");
-      oled.println(buffer[2]);
+      oled.print(buffer[2]);
+      fillLine();
       oled.print("Int:    ");
-      oled.println(interval);
+      oled.print(interval);
+      fillLine();
       oled.print("Packet: ");
-      oled.println(packets);
+      oled.print(packets);
+      fillLine();
       oled.print("Bat:    ");
-      oled.println((float)readSupplyVoltage()/1000);
+      oled.print((float)readSupplyVoltage()/1000);
+      fillLine();
     }
     oled.print(statusmsg);
     oled.println("                    ");