From 486715dd5f9e381eaf2e7183ca735703ba3b5125 Mon Sep 17 00:00:00 2001
From: s3lph <s3lph@kabelsalat.ch>
Date: Sun, 7 May 2023 23:24:58 +0200
Subject: [PATCH] feat: save more power by disabling timer, and use gps time
 for tx interval instead

---
 src/main.cpp | 54 ++++++++++++++++++++++------------------------------
 1 file changed, 23 insertions(+), 31 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 67429da..e1909d3 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -606,8 +606,15 @@ void readNmeaRmc() {
 	  }
 	}
       }
-      uint32_t now = millis();
-      if ((rmc.valid || SEND_INVALID) && ((now - lastBroadcast) / 1000 > config.interval || lastBroadcast == 0)) {
+      if (rmc.valid || SEND_INVALID) {
+	uint32_t now;
+	now = ((rmc.time[0] - '0') * 10 + (rmc.time[1] - '0')) * 3600; // h
+	now += ((rmc.time[2] - '0') * 10 + (rmc.time[3] - '0')) * 60;  // m
+	now += ((rmc.time[4] - '0') * 10 + (rmc.time[5] - '0'));       // s
+	uint32_t interval = (((now - lastBroadcast) % 86400) + 86400) % 86400;
+	if (interval < config.interval) {
+	  return;
+	}
 	lastBroadcast = now;
 	char aprs[256];
 	if (rmc.valid) {
@@ -695,34 +702,6 @@ void setup() {
 
 void loop() {
   readNmeaRmc();
-  uint32_t now = millis();
-#ifdef GPSM_L80R
-  // L80-R: Wake up the module if config.interval has expired - wakeup happens on any serial activity
-  if ((now - lastBroadcast) > config.interval) {
-    Serial.print("\r");
-    Serial.flush();
-  }
-#endif
-  if (abcPressed || setPressed) {
-    lastPressed = now;
-  }
-  if (off) {
-    if (abcPressed || setPressed) {
-      off = false;
-      abcPressed = false;
-      setPressed = false;
-      if (editingConfig || editingComment) {
-	lcd.blink();
-      }
-      lcd.backlight();
-      lcd.display();
-    }
-  } else {
-    if (now - lastPressed > 30000) {
-      off = true;
-      lcd.noDisplay();
-      lcd.noBacklight();
-    }
     if (editingConfig) {
       editConfig();
       return;
@@ -756,6 +735,19 @@ void loop() {
     } else if (page == 3) {
       printDateTime();
     }
+  LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
+  if (!abcPressed && !setPressed) {
+      off = true;
+      lcd.noDisplay();
+      lcd.noBacklight();    
+  } else if (off) {
+      off = false;
+      abcPressed = false;
+      setPressed = false;
+      if (editingConfig || editingComment) {
+	lcd.blink();
+      }
+      lcd.backlight();
+      lcd.display();    
   }
-  LowPower.idle(SLEEP_FOREVER, ADC_OFF, TIMER2_OFF, TIMER1_OFF, TIMER0_ON, SPI_OFF, USART0_ON, TWI_OFF);
 }