Add Nano support (#223)

* Add Nano support
Co-authored-by: Neil Enns <{ID}+{username}@users.noreply.github.com>

_Boards/Atmel/Board_Nano/MFBoards.h

@@ -0,0 +1,67 @@
+//
+// MFBoards.h (Arduino Uno/Nano)
+//
+// (C) MobiFlight Project 2022
+//
+
+#ifndef MFBoardUno_h
+#define MFBoardUno_h
+
+#ifndef MF_SEGMENT_SUPPORT
+#define MF_SEGMENT_SUPPORT 1
+#endif
+#ifndef MF_LCD_SUPPORT
+#define MF_LCD_SUPPORT 1
+#endif
+#ifndef MF_STEPPER_SUPPORT
+#define MF_STEPPER_SUPPORT 1
+#endif
+#ifndef MF_SERVO_SUPPORT
+#define MF_SERVO_SUPPORT 1
+#endif
+#ifndef MF_ANALOG_SUPPORT
+#define MF_ANALOG_SUPPORT 1
+#endif
+#ifndef MF_OUTPUT_SHIFTER_SUPPORT
+#define MF_OUTPUT_SHIFTER_SUPPORT 1
+#endif
+#ifndef MF_INPUT_SHIFTER_SUPPORT
+#define MF_INPUT_SHIFTER_SUPPORT 1
+#endif
+#ifndef MF_MUX_SUPPORT
+#define MF_MUX_SUPPORT 1
+#endif
+#ifndef MF_DIGIN_MUX_SUPPORT
+#define MF_MUX_SUPPORT       1
+#define MF_DIGIN_MUX_SUPPORT 1
+#endif
+
+#define MAX_OUTPUTS         18
+#define MAX_BUTTONS         18
+#define MAX_LEDSEGMENTS     1
+#define MAX_ENCODERS        9
+#define MAX_STEPPERS        2
+#define MAX_MFSERVOS        2
+#define MAX_MFLCD_I2C       2
+#define MAX_ANALOG_INPUTS   6
+#define MAX_OUTPUT_SHIFTERS 2
+#define MAX_INPUT_SHIFTERS  2
+#define MAX_DIGIN_MUX       3
+
+#define STEPS         64
+#define STEPPER_SPEED 400 // 300 already worked, 467, too?
+#define STEPPER_ACCEL 800
+
+#define MOBIFLIGHT_TYPE     "MobiFlight Nano"
+#define MOBIFLIGHT_SERIAL   "0987654321"
+#define MOBIFLIGHT_NAME     "MobiFlight Nano"
+#define EEPROM_SIZE         1024 // EEPROMSizeUno
+#define MEMLEN_CONFIG       286  // max. size for config which wil be stored in EEPROM
+#define MEMLEN_NAMES_BUFFER 220  // max. size for configBuffer, contains only names from inputs
+#define MF_MAX_DEVICEMEM    300  // max. memory size for devices
+
+#define RANDOM_SEED_INPUT A0
+
+#endif
+
+// MFBoards.h

platformio.ini

@@ -100,3 +100,20 @@ lib_deps =
 monitor_speed = 115200
 extra_scripts = 
 	${env.extra_scripts}
+
+; Build settings for the Arduino Nano
+[env:nano]
+platform = atmelavr
+board = nanoatmega328
+framework = arduino
+build_flags = 
+	${env.build_flags}
+	-I./_Boards/Atmel/Board_Nano
+build_src_filter = 
+	${env.build_src_filter}
+	+<../_Boards/Atmel>
+lib_deps = 
+	${env.lib_deps}
+monitor_speed = 115200
+extra_scripts = 
+	${env.extra_scripts}