fix(refresh) switch to portable format specifiers (#2781)

Some platforms define uint32_t as "unsigned long" rather than "unsigned int".
The %d format specifier is mismatched and the C99 format macros are the only
portable way to handle these types.

Co-authored-by: Gabor Kiss-Vamosi <kisvegabor@gmail.com>

docs/CHANGELOG.md

@@ -48,6 +48,7 @@
 - fix(msgbox) add declaration for lv_msgbox_content_class
 - fix(txt) skip basic arabic vowel characters when processing conjunction
 - fix(proto) Remove redundant prototype declarations
+- fix(refresh) Switch to portable format specifiers
 - fix(stm32) Mark unused variable in stm32 DMA2D driver
 
 ## v8.0.2 (16.07.2021)

src/core/lv_refr.c

@@ -307,7 +307,8 @@ void _lv_disp_refr_timer(lv_timer_t * tmr)
         uint32_t used_size = mon.total_size - mon.free_size;;
         uint32_t used_kb = used_size / 1024;
         uint32_t used_kb_tenth = (used_size - (used_kb * 1024)) / 102;
-        lv_label_set_text_fmt(mem_label, "%d.%d kB used (%d %%)\n%d%% frag.", used_kb,  used_kb_tenth, mon.used_pct,
+        lv_label_set_text_fmt(mem_label, "%" LV_PRIu32 ".%" LV_PRIu32 " kB used (%d %%)\n" \
+                              "%d%% frag.", used_kb, used_kb_tenth, mon.used_pct,
                               mon.frag_pct);
     }
 #endif

src/misc/lv_printf.h

@@ -39,12 +39,15 @@
 #    include <inttypes.h>
      /* platform-specific printf format for int32_t, usually "d" or "ld" */
 #    define LV_PRId32 PRId32
+#    define LV_PRIu32 PRIu32
 #  else
 #    define LV_PRId32 "d"
+#    define LV_PRIu32 "u"
 #  endif
 #else
    /* hope this is correct for ports without __has_include or without inttypes.h */
 #  define LV_PRId32 "d"
+#  define LV_PRIu32 "u"
 #endif
 
 #ifdef __cplusplus