More warnings courtesy of -Wextra

Makefile

@@ -6,7 +6,7 @@ SSRCS=crt0.s
 CSRCS=main.c i2c.c wmp.c timer.c
 
 COPTIM?=-O1
-CFLAGS=-march=armv4t -msoft-float $(COPTIM) -Wall -Werror
+CFLAGS=-march=armv4t -msoft-float $(COPTIM) -Wall -Werror -Wextra
 
 LDSCRIPT=lpc2103_flash.ld
 CC=arm-elf-gcc

main.c

@@ -100,12 +100,12 @@ unsigned int count = 0;
 void minmax_sample(void)
 {
 	int count;
-	int fast_roll_min, fast_roll_max;
-	int fast_pitch_min, fast_pitch_max;
-	int fast_yaw_min, fast_yaw_max;
-	int slow_roll_min, slow_roll_max;
-	int slow_pitch_min, slow_pitch_max;
-	int slow_yaw_min, slow_yaw_max;
+	unsigned int fast_roll_min, fast_roll_max;
+	unsigned int fast_pitch_min, fast_pitch_max;
+	unsigned int fast_yaw_min, fast_yaw_max;
+	unsigned int slow_roll_min, slow_roll_max;
+	unsigned int slow_pitch_min, slow_pitch_max;
+	unsigned int slow_yaw_min, slow_yaw_max;
 
 	putstr("Sampling min/max values\r\n");
 	if (!wmp_sample()) {