add LittlevGL demo

add LittlevGL demo on stm32f746 discovery board

components/gui/LittlevGL/3rdparty/lvgl/scripts/built_in_font/built_in_font_gen.py

@@ -0,0 +1,47 @@
+import argparse
+from argparse import RawTextHelpFormatter
+import os
+import sys
+
+parser = argparse.ArgumentParser(description="""Create fonts for LittelvGL including the built-in symbols. lv_font_conv needs to be installed. See https://github.com/littlevgl/lv_font_conv
+Example: python built_in_font_gen.py --size 16 -o lv_font_roboto_16.c --bpp 4 -r 0x20-0x7F""", formatter_class=RawTextHelpFormatter)
+parser.add_argument('-s', '--size', 
+					type=int, 
+					metavar = 'px', 
+					nargs='?', 
+					help='Size of the font in px')
+parser.add_argument('--bpp', 
+					type=int, 
+					metavar = '1,2,4', 
+					nargs='?', 
+					help='Bit per pixel')
+parser.add_argument('-r', '--range', 
+					nargs='+', 
+					metavar = 'start-end', 
+					default='0x20-0x7F', 
+					help='Ranges and/or characters to include. Default is 0x20-7F (ASCII). E.g. -r 0x20-0x7F, 0x200, 324')
+parser.add_argument('--font', 
+					metavar = 'file', 
+					nargs='?', 
+					default='Roboto-Regular.woff', 
+					help='A TTF or WOFF file')
+parser.add_argument('-o', '--output', 
+					nargs='?', 
+					metavar='file', 
+					help='Output file name. E.g. my_font_20.c')
+parser.add_argument('--compressed', action='store_true',
+                    help='Compress the bitmaps')
+                    
+args = parser.parse_args()
+
+if args.compressed == False:
+	compr = "--no-compress --no-prefilter"
+else:
+	compr = ""
+
+#Built in symbols
+syms = "61441,61448,61451,61452,61453,61457,61459,61460,61461,61465,61468,61473,61478,61479,61480,61502,61504,61512,61515,61516,61517,61521,61522,61523,61524,61543,61544,61553,61556,61559,61560,61561,61563,61587,61589,61636,61637,61639,61671,61683,61724,61732,61787,61931,62016,62017,62018,62019,62020,62099"
+
+#Run the command
+cmd = "lv_font_conv {} --bpp {} --size {} --font ./Roboto-Regular.woff -r {} --font FontAwesome.ttf -r {} --format lvgl -o {} --force-fast-kern-format".format(compr, args.bpp, args.size, args.range[0], syms, args.output)
+os.system(cmd)

components/gui/LittlevGL/3rdparty/lvgl/scripts/clang-formatter.sh

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+clang-format-7 -style=file ../src/lv_core/*.c -i
+clang-format-7 -style=file ../src/lv_draw/*.c -i
+clang-format-7 -style=file ../src/lv_hal/*.c -i
+clang-format-7 -style=file ../src/lv_misc/*.c -i
+clang-format-7 -style=file ../src/lv_objx/*.c -i
+clang-format-7 -style=file ../src/lv_themes/*.c -i
+
+clang-format-7 -style=file ../src/lv_core/*.h -i
+clang-format-7 -style=file ../src/lv_draw/*.h -i
+clang-format-7 -style=file ../src/lv_hal/*.h -i
+clang-format-7 -style=file ../src/lv_misc/*.h -i
+clang-format-7 -style=file ../src/lv_objx/*.h -i
+clang-format-7 -style=file ../src/lv_themes/*.h -i

components/gui/LittlevGL/3rdparty/lvgl/scripts/cppcheck_run.sh

@@ -0,0 +1,2 @@
+cppcheck --template="{severity}\t{file}:{line}\t{id}: {message}" --enable=all ../src/ --output-file=cppcheck_res.txt --suppress=unusedFunction --suppress=preprocessorErrorDirective --force
+    

components/gui/LittlevGL/3rdparty/lvgl/scripts/lv_conf_checker.py

@@ -0,0 +1,54 @@
+'''
+Generates a chechker file for lv_conf.h from lv_conf_templ.h define all the not defined values
+'''
+
+
+import re
+
+fin = open("../lv_conf_template.h", "r");
+fout = open("../src/lv_conf_checker.h", "w");
+
+
+fout.write(
+'/**\n\
+ * GENERATED FILE, DO NOT EDIT IT!\n\
+ * @file lv_conf_checker.h\n\
+ * Make sure all the defines of lv_conf.h have a default value\n\
+**/\n\
+\n\
+#ifndef LV_CONF_CHECKER_H\n\
+#define  LV_CONF_CHECKER_H\n\
+'
+)  
+
+inlines = fin.read().splitlines();
+
+started = 0
+
+for i in inlines:
+  if(not started):
+    if('#define LV_CONF_H' in i):
+      started = 1 
+      continue
+    else:
+      continue
+    
+  if('/*--END OF LV_CONF_H--*/' in i): break  
+    
+  if(re.search('^ *# *define .*$', i)): 
+    new = re.sub('^ *# *define', '#define ', i)       
+    new = re.sub(' +', ' ', new)                 #Remove extra white spaces
+    splitted = new.split(' ')
+    fout.write('#ifndef ' + splitted[1] + '\n')
+    fout.write(i + '\n') 
+    fout.write('#endif\n')
+  elif(re.search('^ *typedef .*;.*$', i)):
+    continue;   #igonre typedefs to avoide redeclaration
+  else:
+    fout.write(i + '\n')  
+    
+    
+fout.write(
+'\n\
+#endif  /*LV_CONF_CHECKER_H*/\n\
+')