Merge pull request #160 from gagarcr/FixFindPolePairExample

Fix example. M_PI does not exist, use _PI instead

Author: askuric

examples/utils/calibration/find_pole_pair_number/encoder/find_pole_pairs_number/find_pole_pairs_number.ino

@@ -56,7 +56,7 @@ void setup() {
   Serial.println("-\n");
 
   float pp_search_voltage = 4; // maximum power_supply_voltage/2
-  float pp_search_angle = 6*M_PI; // search electrical angle to turn
+  float pp_search_angle = 6*_PI; // search electrical angle to turn
 
   // move motor to the electrical angle 0
   motor.controller = MotionControlType::angle_openloop;
@@ -90,9 +90,9 @@ void setup() {
   Serial.print(F("Estimated PP : "));
   Serial.println(pp);
   Serial.println(F("PP = Electrical angle / Encoder angle "));
-  Serial.print(pp_search_angle*180/M_PI);
+  Serial.print(pp_search_angle*180/_PI);
   Serial.print("/");
-  Serial.print((angle_end-angle_begin)*180/M_PI);
+  Serial.print((angle_end-angle_begin)*180/_PI);
   Serial.print(" = ");
   Serial.println((pp_search_angle)/(angle_end-angle_begin));
   Serial.println();

examples/utils/calibration/find_pole_pair_number/magnetic_sensor/find_pole_pairs_number/find_pole_pairs_number.ino

@@ -55,7 +55,7 @@ void setup() {
   Serial.println("-\n");
 
   float pp_search_voltage = 4; // maximum power_supply_voltage/2
-  float pp_search_angle = 6*M_PI; // search electrical angle to turn
+  float pp_search_angle = 6*_PI; // search electrical angle to turn
 
   // move motor to the electrical angle 0
   motor.controller = MotionControlType::angle_openloop;
@@ -90,9 +90,9 @@ void setup() {
   Serial.print(F("Estimated PP : "));
   Serial.println(pp);
   Serial.println(F("PP = Electrical angle / Encoder angle "));
-  Serial.print(pp_search_angle*180/M_PI);
+  Serial.print(pp_search_angle*180/_PI);
   Serial.print(F("/"));
-  Serial.print((angle_end-angle_begin)*180/M_PI);
+  Serial.print((angle_end-angle_begin)*180/_PI);
   Serial.print(F(" = "));
   Serial.println((pp_search_angle)/(angle_end-angle_begin));
   Serial.println();