Optionally disable blink during light-sleep

src/PowerFSM.cpp

@@ -17,6 +17,7 @@
 #include "sleep.h"
 #include "target_specific.h"
 
+// How long between LED blinks during light-sleep
 #ifndef SLEEP_TIME
 #define SLEEP_TIME 30
 #endif
@@ -84,19 +85,27 @@ static void lsIdle()
     if (secsSlept < config.power.ls_secs) {
         // If some other service would stall sleep, don't let sleep happen yet
         if (doPreflightSleep()) {
+
+#ifdef LS_NO_BLINK
+            // Sleep now for the full duration
+            uint32_t sleepTime = config.power.ls_secs;
+#else
             // Briefly come out of sleep long enough to blink the led once every few seconds
             uint32_t sleepTime = SLEEP_TIME;
-
+#endif
             setLed(false); // Never leave led on while in light sleep
             esp_sleep_source_t wakeCause2 = doLightSleep(sleepTime * 1000LL);
 
             switch (wakeCause2) {
             case ESP_SLEEP_WAKEUP_TIMER:
-                // Normal case: timer expired, we should just go back to sleep ASAP
 
+#ifndef LS_NO_BLINK
+                // Normal case: timer expired, we should just go back to sleep ASAP
                 setLed(true);                   // briefly turn on led
                 wakeCause2 = doLightSleep(100); // leave led on for 1ms
-
+#else
+                // If LS_NO_BLINK, no action here. Mark complete (secsSlept), and handle next time lsIdle() is called
+#endif
                 secsSlept += sleepTime;
                 // LOG_INFO("sleeping, flash led!\n");
                 break;

variants/heltec_wireless_paper/variant.h

@@ -58,3 +58,4 @@
 
 // Power management
 #define NIMBLE_DEINIT_FOR_DEEPSLEEP // Required to reach manufacturers claim of 18uA
+#define LS_NO_BLINK                 // Prevent LED blink during light-sleep. BLE hardware has slow current ramp-down; too wasteful

variants/heltec_wireless_paper_v1/variant.h

@@ -58,3 +58,4 @@
 
 // Power management
 #define NIMBLE_DEINIT_FOR_DEEPSLEEP // Required to reach manufacturers claim of 18uA
+#define LS_NO_BLINK                 // Prevent LED blink during light-sleep. BLE hardware has slow current ramp-down; too wasteful