Conditionally define M_PI.

dthain · Feb 14, 2018 · cd9d7c3 · cd9d7c3
1 parent 9b05bce
commit cd9d7c3
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/QMC5883L.cpp b/QMC5883L.cpp
@@ -50,6 +50,11 @@
 #define QMC5883L_CONFIG_STANDBY 0b00000000
 #define QMC5883L_CONFIG_CONT    0b00000001
 
+/* Apparently M_PI isn't available in all environments. */
+#ifndef M_PI
+#define M_PI 3.14159265358979323846264338327950288
+#endif
+
 static void write_register( int addr, int reg, int value )
 {
   Wire.beginTransmission(addr);