Initial spectrum commit

This is a work in progress and not fully functional.

Makefile

@@ -5,6 +5,7 @@ MOTO_STARTUP_TONE		:= 1
 ENABLE_AM_FIX			:= 1
 ENABLE_LTO			:= 0
 ENABLE_NOAA			:= 1
+ENABLE_SPECTRUM			:= 1
 
 OBJS =
 # Startup files
@@ -43,6 +44,9 @@ OBJS += app/fm.o
 OBJS += app/lock.o
 OBJS += app/menu.o
 OBJS += app/radio.o
+ifeq ($(ENABLE_SPECTRUM), 1)
+	OBJS += app/spectrum.o
+endif
 OBJS += app/t9.o
 OBJS += app/uart.o
 
@@ -170,6 +174,9 @@ endif
 ifeq ($(ENABLE_NOAA),1)
 	CFLAGS += -DENABLE_NOAA
 endif
+ifeq ($(ENABLE_SPECTRUM), 1)
+	CFLAGS += -DENABLE_SPECTRUM
+endif
 
 all: $(TARGET)
 	$(OBJCOPY) -O binary $< $<.bin

README.md

@@ -63,7 +63,27 @@ Scanning:
 - To force the scan to resume when the scanner stops on a signal, use the `up`/`down` keys.  
 - Press any key other than `Freq scanner` to stop scanning.  
 
-
+### Spectrum Key Mappings
+```
+Up   => Normal: Increase frequency range by frequency +/- (number in middle of bottom row)
+        Holding on a frequency: Move up to the next frequency
+Down => Normal: Decrease frequency range by frequency +/- (number in middle of bottom row)
+        Holding on a frequency: Move down to the previous frequency
+1    => Change number of scan steps (16, 32, 64 or 128)
+2    => 
+3    => Change modulation (AM, FM or SSB)
+4    => Change step size (0.25k - 50k)
+5    => 
+6    => Inrease squelch level
+7    => Hold on current frequency
+8    => 
+9    => Decrease squelch level
+0    => Toggle filter (U = unfiltered, F = filtered)
+*    => Change scan delay (0 - 40ms)
+#    => Toggle bandwidth (W = wide, N = narrow)
+Menu => Jump to VFO mode with current frequency and settings (to allow TX)
+Exit => Exit spectrum
+```
 
 ## Update Instructions
 ### SPI memory backup
@@ -81,6 +101,10 @@ ENABLE_LTO          => Link Time Optimization
 ENABLE_NOAA         => NOAA weather channels (always re-set the sidekeys actions from menu after modifying the available actions)
 ```
 
+<p float="left">
+<img src="/Images/SpectrumDisplay.png" height=300 />
+</p>
+
 ### Build & Flash
 See __Compiler__, __Building__ and __Flashing__ sections below.