ECE 4180 - Final Project Team / Mbed 2 deprecated WalkieTalkie

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Dependencies:   mbed 4DGL-uLCD-SE mbed-rtos nRF24L01P

Microphone.cpp@33:5d86c111d9bc, 2018-04-25 (annotated)

Committer:
Nurchu
Date:
Wed Apr 25 15:39:03 2018 +0000
Revision:
33:5d86c111d9bc
Parent:
8:0222df74596e 
Fixed a few bugs

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Nurchu 2:dc046ff72566 1 #include "Microphone.h"
Nurchu 7:0ac1f1ca8aa6 2 #define UINT8_MAX 255
Nurchu 2:dc046ff72566 3
Nurchu 6:7c72902a735f 4 Microphone::Microphone (PinName pin):
Nurchu 33:5d86c111d9bc 5 _pin(pin), dc(.67 / 3.3)
Nurchu 2:dc046ff72566 6 {}
Nurchu 2:dc046ff72566 7
Nurchu 6:7c72902a735f 8 float Microphone::read()
Nurchu 2:dc046ff72566 9 {
Nurchu 2:dc046ff72566 10 return _pin.read();
Nurchu 2:dc046ff72566 11 }
Nurchu 2:dc046ff72566 12
Nurchu 6:7c72902a735f 13 inline Microphone::operator float ()
Nurchu 2:dc046ff72566 14 {
Nurchu 2:dc046ff72566 15 return _pin.read();
Nurchu 6:7c72902a735f 16 }
Nurchu 6:7c72902a735f 17
Nurchu 6:7c72902a735f 18 uint8_t Microphone::getData()
Nurchu 6:7c72902a735f 19 {
Nurchu 7:0ac1f1ca8aa6 20 // This can be better but this should work for now
Nurchu 33:5d86c111d9bc 21 const static float alpha = 0.99999f;
Nurchu 33:5d86c111d9bc 22 float sample = (float)read();
Nurchu 33:5d86c111d9bc 23
Nurchu 33:5d86c111d9bc 24 dc = alpha*dc + (1.0f - alpha)*sample;
Nurchu 33:5d86c111d9bc 25
Nurchu 33:5d86c111d9bc 26 sample = 0.5f + (sample - dc)* 33.0f;
Nurchu 33:5d86c111d9bc 27 return sample * UINT8_MAX;
Nurchu 2:dc046ff72566 28 }