マイナスの値が出ないように修正

Dependencies:   mbed HMC5883L_2

Revision:
0:26409a44f1f3
Child:
1:c91577293e84
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Feb 06 11:54:51 2019 +0000
@@ -0,0 +1,24 @@
+#include "mbed.h"
+#include "HMC5883L.h"
+
+HMC5883L compass(PB_9, PB_8); 
+
+int main(){ 
+   int16_t a[3];
+   double b;
+  
+   while(1){
+       compass.init();
+       b= compass.getHeadingXYDeg(0,-150);
+       printf("%lf\r\n",b);
+       wait(1);
+       }
+       
+   /*while(1){
+   compass.getXYZ(a);
+   printf("%d, %d, %d,\r\n",a[0],a[2]-150,a[1]);
+   wait(1);}
+*/
+  
+    }
+