Enable extra warnings

build-number.txt

@@ -1 +1 @@
-553
+558

makefile

@@ -23,7 +23,7 @@ endif
 CFLAGS = -mcpu=cortex-m3 -mthumb \
 		 -Os -fno-common -Werror \
 		 -nostartfiles \
-		 -Wall -Xlinker --gc-sections \
+		 -Wall -Wextra -Xlinker --gc-sections \
 		 -D$(H_DEVICE) -D_DEFAULT_SOURCE -T$(LD_SCRIPT) \
 		 -Wl,-Map=$(BUILD_DIR)/$(PROJECT).map -std=c99 \
 		 $(addprefix -I,$(SOURCE_DIRS) $(INCLUDE_DIRS)) $(DEBUG_FLAGS)

src/ltp1245.c

@@ -413,7 +413,7 @@ void ADC1_2_IRQHandler(void)
         
         // Find first temperature higher than the measured one
         int lower_entry = 0;
-        for(int i = 1; i < sizeof(READINGS) / sizeof(READINGS[0]); i++)
+        for(unsigned int i = 1; i < sizeof(READINGS) / sizeof(READINGS[0]); i++)
         {
             if(adc >= READINGS[i])
             {
@@ -421,7 +421,7 @@ void ADC1_2_IRQHandler(void)
                 break;
             }
         }
-        int higher_entry = lower_entry + 1;
+        unsigned int higher_entry = lower_entry + 1;
         int temp = lower_entry * 5 - 40;    // Temperature in °C
 
         // Interpolate linearly