thin printf, but buggy

Makefile

@@ -1,5 +1,5 @@
 ##########################################################################################################################
-# File automatically-generated by tool: [projectgenerator] version: [3.16.0] date: [Sun Mar 12 14:42:27 CET 2023] 
+# File automatically-generated by tool: [projectgenerator] version: [3.16.0] date: [Sun Mar 12 14:42:27 CET 2023]
 ##########################################################################################################################
 
 # ------------------------------------------------
@@ -64,7 +64,12 @@ Middlewares/Third_Party/FreeRTOS/Source/timers.c \
 Middlewares/Third_Party/FreeRTOS/Source/CMSIS_RTOS_V2/cmsis_os2.c \
 Middlewares/Third_Party/FreeRTOS/Source/portable/MemMang/heap_4.c \
 Middlewares/Third_Party/FreeRTOS/Source/portable/GCC/ARM_CM3/port.c \
-Lib/ufb/Src/framebuffer.c Lib/ufb/Src/utf8.c Lib/ufb/Src/font.c Lib/ufb/Src/fb_7seg.c Lib/ufb/Src/fb_text.c \
+Lib/ufb/Src/framebuffer.c \
+Lib/ufb/Src/utf8.c \
+Lib/ufb/Src/font.c \
+Lib/ufb/Src/fb_7seg.c \
+Lib/ufb/Src/fb_text.c \
+Lib/snprintf/snprintf.c \
 Core/Src/dma.c \
 Drivers/STM32F1xx_HAL_Driver/Src/stm32f1xx_ll_gpio.c \
 Drivers/STM32F1xx_HAL_Driver/Src/stm32f1xx_ll_adc.c \
@@ -149,7 +154,8 @@ C_INCLUDES =  \
 -IMiddlewares/Third_Party/FreeRTOS/Source/portable/GCC/ARM_CM3 \
 -IDrivers/CMSIS/Device/ST/STM32F1xx/Include \
 -IDrivers/CMSIS/Include \
--ILib/ufb/Inc
+-ILib/ufb/Inc \
+-ILib/snprintf
 
 
 # compile gcc flags
@@ -211,7 +217,7 @@ $(BUILD_DIR)/%.bin: $(BUILD_DIR)/%.elf | $(BUILD_DIR)
 $(BUILD_DIR):
 	mkdir -p $@
 
-.PHONY: all build flash clean flash flash-stlink analyze
+.PHONY: all flash clean flash-stlink analyze size
 
 #######################################
 # clean up
@@ -228,6 +234,9 @@ clean:
 
 build: all
 
+size: $(BUILD_DIR)/$(TARGET).elf
+	$(SZ) $<
+
 flash-stlink: $(BUILD_DIR)/$(TARGET).bin
 	st-flash write $< 0x8000000