Added example, added makefile

gy521example.c

@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include <wiringPi.h>
+#include "libgy521.h"
+
+int main(void) {
+    wiringPiSetup();
+    
+    setupgy521();
+    
+    while (1) {
+        printf("AngleX = %f, AngleY = %f, AngleZ = %f\n", getAngleX(), getAngleY(), getAngleZ());
+        delay(100);
+    }
+}

libgy521.c

@@ -1,7 +1,9 @@
-#include <wiringPi.h>
+//#include <wiringPi.h>
+#include <wiringPiI2C.h>
 #include <math.h>
-
-#include <libgy521.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "libgy521.h"
 
 //Constants
 
@@ -19,12 +21,12 @@
 int id;
 
 int setupgy521(void) {
-    if (id = wiringPiI2CSetup(MPU6050_I2C_ADDRESS) != -1) {
+    if ((id = wiringPiI2CSetup(MPU6050_I2C_ADDRESS)) != -1) {
         wiringPiI2CReadReg8(id, MPU6050_PWR_MGMT_1);
         wiringPiI2CWriteReg16(id, MPU6050_PWR_MGMT_1, 0);
         return EXIT_SUCCESS;
     } else {
-        return EXIT_FAILURE
+        return EXIT_FAILURE;
     }
 }
 
@@ -70,5 +72,5 @@ float getAngleZ(void) {
     int x = getAccelX();
     int y = getAccelY();
     int z = getAccelZ();
-    return atan((sqrt(po(y, 2) + pow(x, 2))) / z) * 180.0 / M_PI;
+    return atan((sqrt(pow(y, 2) + pow(x, 2))) / z) * 180.0 / M_PI;
 }

makefile

@@ -0,0 +1,20 @@
+#Infos: http://www.ijon.de/comp/tutorials/makefile.html
+
+
+VERSION = 1.0
+CC      = /usr/bin/gcc
+CFLAGS  = -Wall -g -D_REENTRANT -DVERSION=\"$(VERSION)\" 
+#LDFLAGS = -lm -lpthread `gtk-config --cflags` `gtk-config --libs` -lgthread
+LDFLAGS = -lwiringPi -lm
+
+OBJ = gy521example.o libgy521.o
+
+waterpicore: $(OBJ)
+	$(CC) $(CFLAGS) -o gy521example $(OBJ) $(LDFLAGS)
+        
+%.o: %.c
+	$(CC) $(CFLAGS) -c $<
+
+.PHONY: clean
+clean:
+	rm -r *.o