HUB75: use last brightness on re-init

avoids brightness flash when saving LED preferences

Author: softhack007

wled00/bus_manager.cpp

@@ -528,6 +528,7 @@ VirtualMatrixPanel*  BusHub75Matrix::activeFourScanPanel = nullptr;
 HUB75_I2S_CFG BusHub75Matrix::activeMXconfig = HUB75_I2S_CFG();
 uint8_t BusHub75Matrix::activeType = 0;
 uint8_t BusHub75Matrix::instanceCount = 0;
+uint8_t BusHub75Matrix::last_bri = 0;
 
 
 // --------------------------
@@ -899,7 +900,7 @@ BusHub75Matrix::BusHub75Matrix(BusConfig &bc) : Bus(bc.type, bc.start, bc.autoWh
   USER_PRINTLN("MatrixPanel_I2S_DMA created");
   // let's adjust default brightness
   //display->setBrightness8(25);    // range is 0-255, 0 - 0%, 255 - 100% //  [setBrightness()] Tried to set output brightness before begin()
-  _bri = 25;
+  _bri = (last_bri > 0) ? last_bri : 25;  // try to restore persistent brightness value
 
   delay(24); // experimental
   DEBUG_PRINT(F("heap usage: ")); DEBUG_PRINTLN(int(lastHeap - ESP.getFreeHeap()));
@@ -917,6 +918,7 @@ BusHub75Matrix::BusHub75Matrix(BusConfig &bc) : Bus(bc.type, bc.start, bc.autoWh
     USER_PRINT(F("heap usage: ")); USER_PRINTLN(int(lastHeap - ESP.getFreeHeap()));
     delay(18);   // experiment - give the driver a moment (~ one full frame @ 60hz) to settle
     _valid = true;
+    display->setBrightness8(_bri);    // range is 0-255, 0 - 0%, 255 - 100% //  [setBrightness()] Tried to set output brightness before begin()
     display->clearScreen();   // initially clear the screen buffer
     USER_PRINTLN("MatrixPanel_I2S_DMA clear ok");
 
@@ -1057,6 +1059,7 @@ void BusHub75Matrix::setBrightness(uint8_t b, bool immediate) {
   MatrixPanel_I2S_DMA* display = BusHub75Matrix::activeDisplay;
   // if (_bri > 238) _bri=238; // not strictly needed. Enable this line if you see glitches at highest brightness.
   if ((_bri > 253) && (activeMXconfig.latch_blanking < 2)) _bri=253; // prevent glitches at highest brightness.
+  last_bri = _bri;
   if (display) display->setBrightness(_bri);
 }
 

wled00/bus_manager.h

@@ -411,6 +411,7 @@ class BusHub75Matrix : public Bus {
     static HUB75_I2S_CFG activeMXconfig;               // last used mxconfig
     static uint8_t activeType;                         // last used type
     static uint8_t instanceCount;                      // active instances - 0 or 1
+    static uint8_t last_bri;                           // last used brightness value (persists on driver delete)
 };
 #endif
 

wled00/wled00.ino

@@ -61,6 +61,11 @@ void esp_heap_trace_free_hook(void* ptr)
 unsigned long lastMillis = 0; //WLEDMM
 unsigned long loopCounter = 0; //WLEDMM
 
+unsigned long lps = 0; // loops per second
+unsigned long lps2 = 0; // lps without "show"
+
+unsigned long long showtime = 0; // time spent in "show" (micros)
+
 void setup() __attribute__((used)); // needed for -flto
 void setup() {
   #ifdef WLED_DEBUG_HEAP
@@ -73,13 +78,22 @@ void loop() __attribute__((used)); // needed for -flto
 void loop() {
   //WLEDMM show loops per second
   loopCounter++;
-  if (millis() - lastMillis >= 10000) {
+  //if (millis() - lastMillis >= 10000) {
+  if (millis() - lastMillis >= 8000) {
     long delta = millis() - lastMillis;
     if (delta > 0) {
+      lps = (loopCounter*1000U) / delta;
       //USER_PRINTF("%lu lps\n",(loopCounter*1000U) / delta);
+      if (delta > (showtime / 1000)) lps2 = (loopCounter*1000U) / (delta - (showtime / 1000));
+      USER_PRINTF("%lu lps\t", lps);
+      USER_PRINTF("%u fps\t", strip.getFps());
+      USER_PRINTF("%lu lps without show\t\t", lps2);
+      USER_PRINTF("frametime %d\t", int(strip.getFrameTime()));
+      USER_PRINTF("targetFPS %d\n", int(strip.getTargetFps()));
     }
     lastMillis = millis();
     loopCounter = 0;
+    showtime = 0;
   }
 
   WLED::instance().loop();