Template: Optimize for code size

Template/Makefile

@@ -11,9 +11,9 @@ TARGET = gd32vf103
 # building variables
 ######################################
 # debug build?
-DEBUG = 1
+DEBUG = 0
 # optimization
-OPT = -Og
+OPT = -O2
 
 # Build path
 BUILD_DIR = build
@@ -85,7 +85,7 @@ C_INCLUDES =  \
 # compile gcc flags
 ASFLAGS := $(CFLAGS) $(ARCH) $(AS_DEFS) $(AS_INCLUDES) $(OPT) -Wl,-Bstatic#, -ffreestanding -nostdlib
 
-CFLAGS := $(CFLAGS) $(ARCH) $(C_DEFS) $(C_INCLUDES) $(OPT) -Wl,-Bstatic#, -ffreestanding -nostdlib
+CFLAGS := $(CFLAGS) $(ARCH) $(C_DEFS) $(C_INCLUDES) $(OPT) -Wl,-Bstatic  -ffunction-sections -fdata-sections # -ffreestanding -nostdlib
 
 ifeq ($(DEBUG), 1)
 CFLAGS += -g -gdwarf-2
@@ -101,9 +101,9 @@ CFLAGS += -std=gnu11 -MMD -MP # -MF$(@:%.o=%.d) -MT$(@:%.o=%.d)
 LDSCRIPT = $(FIRMWARE_DIR)/RISCV/env_Eclipse/GD32VF103x8.lds
 
 # libraries
-LIBS = -lc_nano -lm
+#LIBS = -lc_nano -lm
 LIBDIR = 
-LDFLAGS = $(ARCH) -T$(LDSCRIPT) $(LIBDIR) $(LIBS) $(PERIFLIB_SOURCES) -Wl,--no-relax -Wl,--gc-sections -Wl,-M=$(BUILD_DIR)/$(TARGET).map -nostartfiles #-ffreestanding -nostdlib
+LDFLAGS = -flto $(ARCH) -T$(LDSCRIPT) $(LIBDIR) $(LIBS) $(PERIFLIB_SOURCES) -Wl,--no-relax -Wl,--gc-sections -Wl,-M=$(BUILD_DIR)/$(TARGET).map -nostartfiles #-ffreestanding -nostdlib
 
 # default action: build all
 all: $(BUILD_DIR)/$(TARGET).elf $(BUILD_DIR)/$(TARGET).hex $(BUILD_DIR)/$(TARGET).bin

Template/systick.c

@@ -43,15 +43,19 @@ OF SUCH DAMAGE.
 */
 void delay_1ms(uint32_t count)
 {
-    uint64_t start_mtime, delta_mtime;
+    volatile uint64_t start_mtime, delta_mtime;
 
-    // Don't start measuruing until we see an mtime tick
-    uint64_t tmp = get_timer_value();
+    volatile uint64_t tmp = get_timer_value();
     do {
-    start_mtime = get_timer_value();
-    } while (start_mtime == tmp);
+    	start_mtime = get_timer_value();
+    } while(start_mtime == tmp);
+
+
+    uint64_t delay_ticks = SystemCoreClock / 4; // 1 second
+    delay_ticks = delay_ticks * count / 1000;
 
     do {
-    delta_mtime = get_timer_value() - start_mtime;
-    }while(delta_mtime <(SystemCoreClock/4000.0 *count ));
+    	delta_mtime = get_timer_value() - start_mtime;
+    } while(delta_mtime < delay_ticks);
+
 }