Added spectrum analyzer from fagci

Makefile

@@ -7,11 +7,11 @@ ENABLE_SWD                    := 0
 ENABLE_OVERLAY                := 1
 ENABLE_UART                   := 1
 ENABLE_AIRCOPY                := 0
-ENABLE_FMRADIO                := 1
+ENABLE_FMRADIO                := 0
 ENABLE_NOAA                   := 0
 ENABLE_VOICE                  := 0
-ENABLE_ALARM                  := 0
-ENABLE_BIG_FREQ               := 0
+ENABLE_ALARM                  := 1
+ENABLE_BIG_FREQ               := 1
 ENABLE_SMALL_BOLD             := 1
 ENABLE_KEEP_MEM_NAME          := 1
 ENABLE_WIDE_RX                := 1
@@ -28,6 +28,7 @@ ENABLE_AM_FIX_SHOW_DATA       := 1
 ENABLE_SQUELCH1_LOWER         := 0
 ENABLE_RSSI_BAR               := 1
 ENABLE_AUDIO_BAR              := 1
+ENABLE_SPECTRUM               := 1
 #ENABLE_COPY_CHAN_TO_VFO      := 1
 #ENABLE_SINGLE_VFO_CHAN       := 1
 #ENABLE_BAND_SCOPE            := 1
@@ -88,6 +89,9 @@ endif
 OBJS += app/generic.o
 OBJS += app/main.o
 OBJS += app/menu.o
+ifeq ($(ENABLE_SPECTRUM), 1)
+OBJS += app/spectrum.o
+endif
 OBJS += app/scanner.o
 ifeq ($(ENABLE_UART),1)
 	OBJS += app/uart.o
@@ -156,6 +160,10 @@ CFLAGS = -Os -Wall -Werror -mcpu=cortex-m0 -fno-builtin -fshort-enums -fno-delet
 
 CFLAGS += -DPRINTF_INCLUDE_CONFIG_H
 CFLAGS += -DGIT_HASH=\"$(GIT_HASH)\"
+
+ifeq ($(ENABLE_SPECTRUM),1)
+CFLAGS += -DENABLE_SPECTRUM
+endif
 ifeq ($(ENABLE_SWD),1)
 	CFLAGS += -DENABLE_SWD
 endif

app/main.c

@@ -24,6 +24,9 @@
 #include "app/generic.h"
 #include "app/main.h"
 #include "app/scanner.h"
+#ifdef ENABLE_SPECTRUM
+#include "app/spectrum.h"
+#endif
 #include "audio.h"
 #include "driver/bk4819.h"
 #include "dtmf.h"
@@ -176,7 +179,10 @@ static void processFKeyFunction(const KEY_Code_t Key, const bool beep)
 				}
 				gRequestSaveVFO   = true;
 				gVfoConfigureMode = VFO_CONFIGURE_RELOAD;
-			#else
+			#elif defined(ENABLE_SPECTRUM)
+				APP_RunSpectrum();
+				gRequestDisplayScreen = DISPLAY_MAIN;
+			#else 
 				// toggle scanlist-1 and scanlist 2
 				if (gScreenToDisplay != DISPLAY_SCANNER)
 				{