Chris Wilson / MSGEQ7

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Dependents:   MSGEQ7_Hello_World LCD_Spectrum_Analyzer 4180_Lab4 MSGEQ7_Hello_World ... more

MSGEQ7.cpp@0:974a4855a7f8, 2013-10-16 (annotated)

Committer:
chrisisthefish
Date:
Wed Oct 16 06:33:29 2013 +0000
Revision:
0:974a4855a7f8
Created MSGEQ7 Library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
chrisisthefish 0:974a4855a7f8 1 /*
chrisisthefish 0:974a4855a7f8 2 MSGEQ7 Library for interfacing to the MSGEQ7 Seven Band Grapic Equalizer chip made by Mixed Signal Integration
chrisisthefish 0:974a4855a7f8 3
chrisisthefish 0:974a4855a7f8 4 Chris Wilson
chrisisthefish 0:974a4855a7f8 5 twilson8@gatech.edu
chrisisthefish 0:974a4855a7f8 6 10/16/2013
chrisisthefish 0:974a4855a7f8 7 */
chrisisthefish 0:974a4855a7f8 8
chrisisthefish 0:974a4855a7f8 9 #include "MSGEQ7.h"
chrisisthefish 0:974a4855a7f8 10 #include "mbed.h"
chrisisthefish 0:974a4855a7f8 11
chrisisthefish 0:974a4855a7f8 12 MSGEQ7::MSGEQ7(PinName reset, PinName strobe, PinName analog):
chrisisthefish 0:974a4855a7f8 13 _reset(reset), _strobe(strobe), _analog(analog) {
chrisisthefish 0:974a4855a7f8 14
chrisisthefish 0:974a4855a7f8 15 // Initial condition of output enables
chrisisthefish 0:974a4855a7f8 16 _reset = 0;
chrisisthefish 0:974a4855a7f8 17 _strobe = 1;
chrisisthefish 0:974a4855a7f8 18 }
chrisisthefish 0:974a4855a7f8 19
chrisisthefish 0:974a4855a7f8 20 /* The user is given two choices as to what format the data is returned to them in:
chrisisthefish 0:974a4855a7f8 21 1. One byte - readByte
chrisisthefish 0:974a4855a7f8 22 2. Integer - readInt
chrisisthefish 0:974a4855a7f8 23 */
chrisisthefish 0:974a4855a7f8 24
chrisisthefish 0:974a4855a7f8 25 float MSGEQ7::read(){
chrisisthefish 0:974a4855a7f8 26 float reading = 0.0;
chrisisthefish 0:974a4855a7f8 27 _strobe = 0;
chrisisthefish 0:974a4855a7f8 28 wait_us(30); //Wait 30us for output to settle
chrisisthefish 0:974a4855a7f8 29 reading = _analog;
chrisisthefish 0:974a4855a7f8 30 _strobe = 1;
chrisisthefish 0:974a4855a7f8 31 return reading;
chrisisthefish 0:974a4855a7f8 32 }
chrisisthefish 0:974a4855a7f8 33
chrisisthefish 0:974a4855a7f8 34
chrisisthefish 0:974a4855a7f8 35 // readByte() reads the frequency values then stores them in unsigned char array freqDataByte,
chrisisthefish 0:974a4855a7f8 36 // with each frequency magnitude between 0 to 255
chrisisthefish 0:974a4855a7f8 37 void MSGEQ7::readByte() {
chrisisthefish 0:974a4855a7f8 38 _reset = 1;
chrisisthefish 0:974a4855a7f8 39 _reset = 0;
chrisisthefish 0:974a4855a7f8 40
chrisisthefish 0:974a4855a7f8 41 // Read all 7 frequency values and store them in the array
chrisisthefish 0:974a4855a7f8 42 for (int i = 0; i < 7; i++){
chrisisthefish 0:974a4855a7f8 43 freqDataByte[i] = char(read() * 255); //Mult by 255 to properly scale reading
chrisisthefish 0:974a4855a7f8 44 }
chrisisthefish 0:974a4855a7f8 45 }
chrisisthefish 0:974a4855a7f8 46
chrisisthefish 0:974a4855a7f8 47
chrisisthefish 0:974a4855a7f8 48 // readInt() reads the frequency values, then stores them in integer array freqDataInt,
chrisisthefish 0:974a4855a7f8 49 // with each frequency magnitude between 0 to a value 'max' specified by the user
chrisisthefish 0:974a4855a7f8 50 void MSGEQ7::readInt(int max) {
chrisisthefish 0:974a4855a7f8 51 _reset = 1;
chrisisthefish 0:974a4855a7f8 52 _reset = 0;
chrisisthefish 0:974a4855a7f8 53
chrisisthefish 0:974a4855a7f8 54 // Read all 7 frequency values and store them in the array
chrisisthefish 0:974a4855a7f8 55 for (int i = 0; i < 7; i++){
chrisisthefish 0:974a4855a7f8 56 freqDataInt[i] = int(read() * max); //Mult by 'max' to properly scale reading
chrisisthefish 0:974a4855a7f8 57 }
chrisisthefish 0:974a4855a7f8 58 }