From 970868457db223e81a738c3226f8ad2f9d770e16 Mon Sep 17 00:00:00 2001
From: s3lph <s3lph@kabelsalat.ch>
Date: Sat, 6 May 2023 22:42:44 +0200
Subject: [PATCH] feat: power saving

---
 platformio.ini |  1 +
 src/main.cpp   | 20 +++++++++-----------
 2 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/platformio.ini b/platformio.ini
index 3e4e34f..9086f13 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -14,6 +14,7 @@ board = nanoatmega328
 framework = arduino
 lib_deps =
     https://github.com/marcoschwartz/LiquidCrystal_I2C
+    https://github.com/rocketscream/Low-Power
 upload_protocol = custom
 upload_flags =
     -C
diff --git a/src/main.cpp b/src/main.cpp
index 766ec25..64f6563 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -6,6 +6,7 @@
 #include <Wire.h>
 #include <EEPROM.h>
 
+#include <LowPower.h>
 #include <LiquidCrystal_I2C.h>
 
 #define OUT_PORT PORTC
@@ -223,7 +224,7 @@ volatile bool setPressed = false;
 volatile bool abcPressed = false;
 uint8_t page = 0;
 uint32_t lastPressed = 0;
-bool off = false;
+bool off = true;
 bool editingConfig = false;
 bool editingComment = false;
 uint8_t configEditState = 0;
@@ -525,8 +526,6 @@ void readNmeaRmc() {
 	} else {
 	  nmeaState = 0;
 	}
-	Serial.println(nmeaStr);
-	Serial.flush();
       }
     }
     if (nmeaState == 2) {
@@ -612,7 +611,6 @@ void readNmeaRmc() {
 	}
 	memcpy(aprs+34, config.comment, config.commentLen);
 	aprs[34+config.commentLen] = 0;
-	Serial.println(aprs);
 	// AX.25 3.8 - FCS is sent MSB first
 	uint16_t fcs = 0xffff;
 	for (size_t i = 0; i < sizeof(frame); ++i) {
@@ -645,6 +643,9 @@ void readNmeaRmc() {
 
 void setup() {
   Serial.begin(9600);
+  // ublox NEO-6M: Switch to low-power on-off mode with peak current limiting - not sure if this actually works
+  Serial.print("\xb5\x62\x06\x3b\x2c\x00\x01\x06\x00\x00\x0e\x81\x00\x00\x60\xea\x00\x00\x10\x27\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x2c\x01\x00\x00\x4f\xc1\x03\x00\x86\x02\x00\x00\xfe\x00\x00\x00\x64\x40\x01\x00\xf1\xd5");
+  Serial.flush();
   // ublox NEO-6M: Disable all NMEA sentences except for GPTXT and GPRMC
   Serial.println("$PUBX,40,GLL,0,0,0,0,0,0*5C");
   Serial.println("$PUBX,40,GSV,0,0,0,0,0,0*59");
@@ -652,9 +653,6 @@ void setup() {
   Serial.println("$PUBX,40,VTG,0,0,0,0,0,0*5E");
   Serial.println("$PUBX,40,GGA,0,0,0,0,0,0*5A");
   Serial.flush();
-  // ublox NEO-6M: Switch to low-power on-off mode with peak current limiting - not sure if this actually works
-  Serial.print("\xB5\x62\x06\x3B\x2C\x00\x01\x06\x00\x00\x0E\x91\x00\x00\x60\xEA\x00\x00\x10\x27\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00\x2C\x01\x00\x00\x4F\xC1\x03\x00\x86\x02\x00\x00\xFE\x00\x00\x00\x64\x40\x01\x00\x01\x45");
-  Serial.flush();
   OUT_DDR |= 0x0f;
   pinMode(PTT, OUTPUT);
   digitalWrite(PTT, LOW);
@@ -668,7 +666,7 @@ void setup() {
   attachInterrupt(digitalPinToInterrupt(2), isrSet, FALLING);
   attachInterrupt(digitalPinToInterrupt(3), isrAbc, FALLING);
   lcd.init();
-  lcd.backlight();
+  lcd.noDisplay();
   setPressed = false;
   abcPressed = false;
 }
@@ -689,13 +687,12 @@ void loop() {
 	lcd.blink();
       }
       lcd.backlight();
-      lcd.on();
+      lcd.display();
     }
     return;
   } else if (now - lastPressed > 30000) {
     off = true;
-    lcd.off();
-    lcd.noBlink();
+    lcd.noDisplay();
     lcd.noBacklight();
   }
   if (editingConfig) {
@@ -731,4 +728,5 @@ void loop() {
   } else if (page == 3) {
     printDateTime();
   }
+  LowPower.idle(SLEEP_FOREVER, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_ON, SPI_OFF, USART0_ON, TWI_OFF);
 }