From 1abff035cb4711591e460c62819ce978ac88a9e3 Mon Sep 17 00:00:00 2001
From: rbaron <rbaron@rbaron.net>
Date: Sat, 12 Feb 2022 18:37:43 +0100
Subject: [PATCH] Adds PRST_BLINK_LED config to save battery

---
 code/b-parasite/config/prst_config.h | 3 +++
 code/b-parasite/src/main.c           | 9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/code/b-parasite/config/prst_config.h b/code/b-parasite/config/prst_config.h
index b41c38e..895e11d 100644
--- a/code/b-parasite/config/prst_config.h
+++ b/code/b-parasite/config/prst_config.h
@@ -11,6 +11,9 @@
 #define PRST_VERSION_1_2_X
 
 // Built-in LED.
+// Wether or not to turn the LED on/off during the wake-up cycle. Impacts
+// battery life.
+#define PRST_BLINK_LED 0
 #define PRST_LED_PIN NRF_GPIO_PIN_MAP(0, 28)
 
 // Deep sleep.
diff --git a/code/b-parasite/src/main.c b/code/b-parasite/src/main.c
index 821da77..6140a88 100644
--- a/code/b-parasite/src/main.c
+++ b/code/b-parasite/src/main.c
@@ -56,7 +56,9 @@ static void power_manage(void) {
 // - Turn on BLE advertising for a while;
 // - Turn everything off and return back to sleep.
 static void rtc_callback() {
+#if PRST_BLINK_LED
   nrf_gpio_pin_set(PRST_LED_PIN);
+#endif
   prst_shtc3_read_t temp_humi = prst_shtc3_read();
   nrf_gpio_pin_set(PRST_FAST_DISCH_PIN);
   prst_pwm_init();
@@ -81,7 +83,9 @@ static void rtc_callback() {
   prst_adv_start();
   nrf_delay_ms(PRST_BLE_ADV_TIME_IN_MS);
   prst_adv_stop();
+#if PRST_BLINK_LED
   nrf_gpio_pin_clear(PRST_LED_PIN);
+#endif
   NRF_LOG_FLUSH();
   run_counter++;
 }
@@ -94,6 +98,11 @@ int main(void) {
   prst_adc_init();
   prst_shtc3_init();
 
+  // Quick LED flash.
+  nrf_gpio_pin_set(PRST_LED_PIN);
+  nrf_delay_ms(200);
+  nrf_gpio_pin_clear(PRST_LED_PIN);
+
   // Set up RTC. It will call our custom callback at a regular interval, defined
   // by PRST_DEEP_SLEEP_IN_SECONDS.
   prst_rtc_set_callback(rtc_callback);