improve support for -S2

got myself an adafruit "qt py -S2" with tinyUF2 bootloader. So I wanted to get that working. And it does work :-).
FFT time = 10ms (instead of 2ms on classic ESP32)  is a very good result, also virtual USB runs much better now.

platformio.ini

@@ -134,6 +134,7 @@ build_flags =
   -D DECODE_SONY=true
   -D DECODE_SAMSUNG=true
   -D DECODE_LG=true
+  -D DECODE_RC5=true
   ; -Dregister= # remove warnings in C++17 due to use of deprecated register keyword by the FastLED library
   -DWLED_USE_MY_CONFIG
   ; -D USERMOD_SENSORSTOMQTT
@@ -616,7 +617,7 @@ lib_deps_min =
 
 build_flags_max = 
   -D WLED_MAX_USERMODS=9 ; default only 4-6
-  -D ARDUINO_USB_CDC_ON_BOOT=0 ; needed for arduino-esp32 >=2.0.4 ewowi to softhack: move to build_flags_min?
+  ;; -D ARDUINO_USB_CDC_ON_BOOT=0 ; needed for arduino-esp32 >=2.0.4 ewowi to softhack: move to build_flags_min? - We need a different solution
   -D WLED_USE_MY_CONFIG ; include custom my_config.h ewowi to softhack: redundant as also in build_flags_min?
   -D USERMOD_DALLASTEMPERATURE
   -D USE_ALT_DISPLAY ; new versions of USERMOD_FOUR_LINE_DISPLAY and USERMOD_ROTARY_ENCODER_UI
@@ -874,6 +875,67 @@ board_build.flash_mode = qio
 ; RAM:   [==        ]  24.7% (used 80856 bytes from 327680 bytes)
 ; Flash: [=======   ]  66.9% (used 1403489 bytes from 2097152 bytes)
 
+;; MM max for Adafruit QT Py ESP32-S2 -> 4MB flash, PSRAM, and tinyUF2 bootloader
+;; to ewowi - i'll optimize this entry later, as a few things can be inherited for sure
+[env:esp32s2_tinyUF2_PSRAM_max]
+extends = esp32_4MB_V4_min_base
+platform = ${esp32.platformV4}
+platform_packages = ${esp32.platformV4_packages}
+
+board = adafruit_qtpy_esp32s2
+board_build.partitions = tools/partitions-4MB-tinyuf2_spiffs.csv ;; this is needed for tinyUF2 bootloader!
+board_build.f_flash = 80000000L
+board_build.flash_mode = qio
+upload_speed = 256000 ;; 921600
+build_unflags = ${common.build_unflags}
+  -D USERMOD_DALLASTEMPERATURE ;; disabled because it hangs during usermod setup on -S2 (autodetect broken?)
+  -D USE_ALT_DISPLAY ;; four line display seems to have problems with I2C - it hangs during usermod setup
+  -D USERMOD_FOUR_LINE_DISPLAY ;; see above
+  -D USERMOD_ROTARY_ENCODER_UI ;; see above
+  -D WLED_ENABLE_DMX ;; disabled because it does not work with ESP-IDF 4.4.x (buggy driver in SparkFunDMX)
+
+build_flags = ${common.build_flags} ${esp32.build_flagsV4} ${esp32s2.build_flags} 
+  -D WLED_WATCHDOG_TIMEOUT=0 -D CONFIG_ASYNC_TCP_USE_WDT=0
+  ${common_mm.build_flags_min} ${common_mm.build_flags_max}
+  -Wno-misleading-indentation -Wno-format-truncation
+  -D WLED_RELEASE_NAME=esp32S2_4MB_UF2_max
+  -DARDUINO_USB_CDC_ON_BOOT=1  ;; mandatory, otherwise USB does not work!!
+  -DARDUINO_USB_MSC_ON_BOOT=0 -DARDUINO_USB_DFU_ON_BOOT=0
+  -D SERVERNAME='"WLED-S2"'
+  -D WLED_USE_PSRAM
+  -D WLED_DISABLE_INFRARED ;; save flash space
+  -D WLED_DISABLE_ALEXA    ;; save flash space
+  -D LEDPIN=39 ;; onboard neopixel LED. Attach your own LEDs to GPIO 7 or GPIO 6
+  -D BTNPIN=0
+  ;-D RLYPIN=6
+  ;-D IRPIN=7
+  -D HW_PIN_SCL=40
+  -D HW_PIN_SDA=41
+  -D HW_PIN_DATASPI=35
+  -D HW_PIN_CLOCKSPI=36
+  -D HW_PIN_MISOSPI=37
+  -D AUDIOPIN=-1
+  -D SR_DMTYPE=1
+  -D I2S_SDPIN=9
+  -D I2S_WSPIN=8
+  -D I2S_CKPIN=17  
+  -D MCLK_PIN=18
+  ;-D STATUSLED=-1
+  -D WLED_USE_MY_CONFIG
+  ; -D WLED_DEBUG_HOST='"192.168.xxx.xxx"' ;; to send debug messages over network to host 192.168.x.y - FQDN is also possible
+  ; -D WLED_DEBUG_NET_PORT=1768 ;; port for network debugging. default = 7868
+  ; -D WLED_DEBUG
+  ; -D SR_DEBUG
+  ; -D MIC_LOGGER
+lib_deps = ${env.lib_deps} ${esp32s2.lib_deps} ${common_mm.lib_deps_min} ${common_mm.lib_deps_max}
+  paulstoffregen/OneWire@ ^2.3.7 ; used for USERMOD_DALLASTEMPERATURE -> need newer release with bugfixes for -S3; still requires TEMPERATURE_PIN < 46
+  olikraus/U8g2@ ^2.34.5 ; used for USERMOD_FOUR_LINE_DISPLAY -> need newer version with bugfixes for arduino-esp32 v2.0.4 (Wire inititialization) 
+  ElectronicCats/MPU6050 @ 0.6.0 ; used for USERMOD_MPU6050_IMU
+lib_ignore = IRremoteESP8266 ; use with WLED_DISABLE_INFRARED for faster compilation
+monitor_filters = esp32_exception_decoder
+; RAM:   [===       ]  25.6% (used 83796 bytes from 327680 bytes)
+; Flash: [==========]  97.7% (used 1408626 bytes from 1441792 bytes)
+
 # ------------------------------------------------------------------------------
 # custom board configurations
 # ------------------------------------------------------------------------------

usermods/audioreactive/audio_reactive.h

@@ -264,10 +264,14 @@ static float windowWeighingFactors[samplesFFT] = {0.0f};
 // Create FFT object
 #ifdef UM_AUDIOREACTIVE_USE_NEW_FFT
 // lib_deps += https://github.com/kosme/arduinoFFT#develop @ 1.9.2
+#if  !defined(CONFIG_IDF_TARGET_ESP32S2) && !defined(CONFIG_IDF_TARGET_ESP32C3)
+// these options actually cause slow-down on -S2 (-S2 doesn't have floating point hardware)
 #define FFT_SPEED_OVER_PRECISION     // enables use of reciprocals (1/x etc), and an a few other speedups
 #define FFT_SQRT_APPROXIMATION       // enables "quake3" style inverse sqrt
-#define sqrt(x) sqrtf(x)             // little hack that reduces FFT time by 50% on ESP32 (as alternative to FFT_SQRT_APPROXIMATION)
+#endif
+#define sqrt(x) sqrtf(x)             // little hack that reduces FFT time by 10-50% on ESP32 (as alternative to FFT_SQRT_APPROXIMATION)
 #else
+  // around 50% slower on -S2
 // lib_deps += https://github.com/blazoncek/arduinoFFT.git
 #endif
 #include <arduinoFFT.h>
@@ -1447,10 +1451,10 @@ class AudioReactive : public Usermod {
         int userloopDelay = int(t_now - lastUMRun);
         if (lastUMRun == 0) userloopDelay=0; // startup - don't have valid data from last run.
 
-        #ifdef WLED_DEBUG
+        #if defined(WLED_DEBUG) || defined(SR_DEBUG) || defined(SR_STATS)
           // complain when audio userloop has been delayed for long time. Currently we need userloop running between 500 and 1500 times per second. 
-          if ((userloopDelay > 23) && !disableSoundProcessing && (audioSyncEnabled == 0)) {
-            DEBUG_PRINTF("[AR userLoop] hickup detected -> was inactive for last %d millis!\n", userloopDelay);
+          if ((userloopDelay > /*23*/ 30) && !disableSoundProcessing && (audioSyncEnabled == 0)) {
+            USER_PRINTF("[AR userLoop] hickup detected -> was inactive for last %d millis!\n", userloopDelay);
           }
         #endif
 

usermods/audioreactive/audio_source.h

@@ -23,14 +23,14 @@
 
 // see https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/hw-reference/chip-series-comparison.html#related-documents
 // and https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/api-reference/peripherals/i2s.html#overview-of-all-modes
-#if defined(CONFIG_IDF_TARGET_ESP32C2) || defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32S2) || defined(CONFIG_IDF_TARGET_ESP32C5) || defined(CONFIG_IDF_TARGET_ESP32C6) || defined(CONFIG_IDF_TARGET_ESP32H2) || defined(ESP8266) || defined(ESP8265)
+#if defined(CONFIG_IDF_TARGET_ESP32C2) || defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32C5) || defined(CONFIG_IDF_TARGET_ESP32C6) || defined(CONFIG_IDF_TARGET_ESP32H2) || defined(ESP8266) || defined(ESP8265)
   // there are two things in these MCUs that could lead to problems with audio processing:
   // * no floating point hardware (FPU) support - FFT uses float calculations. If done in software, a strong slow-down can be expected (between 8x and 20x)
   // * single core, so FFT task might slow down other things like LED updates
   #if !defined(SOC_I2S_NUM) || (SOC_I2S_NUM < 1)
-  #error This audio reactive usermod does not support ESP32-C2, ESP32-C3 or ESP32-S2.
+  #error This audio reactive usermod does not support ESP32-C2 or ESP32-C3.
   #else
-  #warning This audio reactive usermod does not support ESP32-C2, ESP32-C3 or ESP32-S2.
+  #warning This audio reactive usermod does not support ESP32-C2 and ESP32-C3.
   #endif
 #endif
 

wled00/pin_manager.cpp

@@ -538,6 +538,7 @@ bool PinManagerClass::isPinOk(byte gpio, bool output)
     // 38 to 48 are for general use. Be careful about straping pins GPIO45 and GPIO46 - these may be pull-up or pulled-down on your board.
   #elif defined(CONFIG_IDF_TARGET_ESP32S2)
     // strapping pins: 0, 45 & 46
+    if (gpio > 18 && gpio < 21) return false;     // WLEDMM: 19 + 20 = USB HWCDC. Not recommended for other uses.
     if (gpio > 21 && gpio < 33) return false;     // 22 to 32: not connected + SPI FLASH
     // JTAG: GPIO39-42 are usually used for inline debugging
     // GPIO46 is input only and pulled down

wled00/wled.cpp

@@ -282,8 +282,13 @@ void WLED::setup()
 
   #if ARDUINO_USB_CDC_ON_BOOT
   delay(2500);  // WLEDMM: always allow CDC USB serial to initialise
+  Serial.println("wait 1");  // waiting a bit longer ensures that a  debug messages are shown in serial monitor
+  delay(2500);
+  Serial.println("wait 2");
+  delay(2500);
+
   Serial.flush();
-  //Serial.setTimeout(350); // WLEDMM: don't change timeout, as it causes crashes later
+  Serial.setTimeout(350); // WLEDMM: don't change timeout, as it causes crashes later
   // WLEDMM: redirect debug output to HWCDC
   Serial0.setDebugOutput(false);
   Serial.setDebugOutput(true);