From 02c3298fcaa41b41b6cbc579beabcfbe30bdd10b Mon Sep 17 00:00:00 2001
From: Matias N <matias@protobits.dev>
Date: Sun, 29 Nov 2020 11:34:56 -0300
Subject: [PATCH] LVGL: use NuttX's printf()

---
 examples/lvgldemo/Makefile | 4 ++--
 graphics/lvgl/Makefile     | 4 ++++
 graphics/lvgl/lv_conf.h    | 2 +-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/examples/lvgldemo/Makefile b/examples/lvgldemo/Makefile
index 2b30f473c..c1577afe5 100644
--- a/examples/lvgldemo/Makefile
+++ b/examples/lvgldemo/Makefile
@@ -86,8 +86,8 @@ endif
 
 MAINSRC = lvgldemo.c
 
-CFLAGS += ${shell $(DEFINE) "$(CC)" LV_LVGL_H_INCLUDE_SIMPLE}
-CXXFLAGS += ${shell $(DEFINE) "$(CC)" LV_LVGL_H_INCLUDE_SIMPLE}
+CFLAGS += ${shell $(DEFINE) "$(CC)" LV_LVGL_H_INCLUDE_SIMPLE} -Wno-format
+CXXFLAGS += ${shell $(DEFINE) "$(CC)" LV_LVGL_H_INCLUDE_SIMPLE} -Wno-format
 
 $(LVGL_EXAMPLES_TARBALL):
 	@echo "Downloading: $(LVGL_EXAMPLES_TARBALL)"
diff --git a/graphics/lvgl/Makefile b/graphics/lvgl/Makefile
index fd386d13f..f60afd8d5 100644
--- a/graphics/lvgl/Makefile
+++ b/graphics/lvgl/Makefile
@@ -40,6 +40,10 @@ include $(APPDIR)/Make.defs
 LVGL_DIR = .
 LVGL_DIR_NAME = lvgl
 
+# Relax format check for LVGL to avoid errors on prinf() use
+
+CFLAGS += -Wno-format
+
 # LVGL Libraries
 
 -include ./lvgl/src/lv_core/lv_core.mk
diff --git a/graphics/lvgl/lv_conf.h b/graphics/lvgl/lv_conf.h
index 16ad75090..721044f8d 100644
--- a/graphics/lvgl/lv_conf.h
+++ b/graphics/lvgl/lv_conf.h
@@ -753,7 +753,7 @@ typedef void * lv_font_user_data_t;
 
 /* Change the built in (v)snprintf functions */
 
-#define LV_SPRINTF_CUSTOM   0
+#define LV_SPRINTF_CUSTOM   1
 #if LV_SPRINTF_CUSTOM
 #  define LV_SPRINTF_INCLUDE <stdio.h>
 #  define lv_snprintf     snprintf