add: PwmOut::read_pulsewitdth_us() for compatibility

Author: yutotnh

drivers/include/drivers/PwmOut.h

@@ -137,6 +137,13 @@ class PwmOut {
      */
     int read_pulsewidth_us();
 
+    /** Read the PWM pulsewidth
+     *  @returns
+     *   The PWM pulsewith, specified in microseconds (int)
+     */
+    MBED_DEPRECATED("use read_pulsewidth_us() instead")
+    int read_pulsewitdth_us();
+
     /** Suspend PWM operation
      *
      * Control the PWM state. This is primarily intended

drivers/source/PwmOut.cpp

@@ -121,6 +121,11 @@ int PwmOut::read_pulsewidth_us()
     return val;
 }
 
+int PwmOut::read_pulsewitdth_us()
+{
+    return read_pulsewidth_us();
+}
+
 void PwmOut::suspend()
 {
     core_util_critical_section_enter();