fix(lv_conf_internal): be sure Kconfig defines are always uppercase

fixes #1989

scripts/lv_conf_checker.py

@@ -93,14 +93,14 @@ for i in fin.read().splitlines():
   
   if r:
     line = re.sub('\(.*?\)', '', r[1], 1)    #remove parentheses from macros
-    
+    line_upper = line.upper();
     dr = re.sub('.*# *define', '', i, 1)
     d = "#    define " + dr
-
+		
     fout.write(
       f'#ifndef {line}\n'
-      f'#  ifdef CONFIG_{line}\n'
-      f'#    define {line} CONFIG_{line}\n'
+      f'#  ifdef CONFIG_{line_upper}\n'
+      f'#    define {line} CONFIG_{line_upper}\n'
       f'#  else\n'
       f'{d}\n'
       f'#  endif\n'

src/lv_conf_internal.h

@@ -602,7 +602,7 @@ e.g. "stm32f769xx.h" or "stm32f429xx.h" */
  * (I.e. no new image decoder is added)
  * With complex image decoders (e.g. PNG or JPG) caching can save the continuous open/decode of images.
  * However the opened images might consume additional RAM.
- * LV_IMG_CACHE_DEF_SIZE must be >= 1 */
+ * Set it to 0 to disable caching */
 #ifndef LV_IMG_CACHE_DEF_SIZE
 #  ifdef CONFIG_LV_IMG_CACHE_DEF_SIZE
 #    define LV_IMG_CACHE_DEF_SIZE CONFIG_LV_IMG_CACHE_DEF_SIZE
@@ -1373,15 +1373,15 @@ e.g. "stm32f769xx.h" or "stm32f429xx.h" */
 #  endif
 #endif
 #ifndef lv_snprintf
-#  ifdef CONFIG_lv_snprintf
-#    define lv_snprintf CONFIG_lv_snprintf
+#  ifdef CONFIG_LV_SNPRINTF
+#    define lv_snprintf CONFIG_LV_SNPRINTF
 #  else
 #    define  lv_snprintf     snprintf
 #  endif
 #endif
 #ifndef lv_vsnprintf
-#  ifdef CONFIG_lv_vsnprintf
-#    define lv_vsnprintf CONFIG_lv_vsnprintf
+#  ifdef CONFIG_LV_VSNPRINTF
+#    define lv_vsnprintf CONFIG_LV_VSNPRINTF
 #  else
 #    define  lv_vsnprintf    vsnprintf
 #  endif