Luke Cartwright / Mbed 2 deprecated ELEC2645_Project_el18loc_nearlythere

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Dependencies:   mbed

Sound/Sound.cpp@24:c3bb1b0b2207, 2020-05-24 (annotated)

Committer:
lukeocarwright
Date:
Sun May 24 15:20:31 2020 +0000
Revision:
24:c3bb1b0b2207
Parent:
18:204cd747b54a
Child:
30:08cc4ec58d07
Basic Filtering Implemented & sample rate dropped to account for additional CPU usage

Who changed what in which revision?

UserRevisionLine numberNew contents of line
lukeocarwright 14:9cfe0041cc4e 1 #include "Sound.h"
lukeocarwright 14:9cfe0041cc4e 2
lukeocarwright 14:9cfe0041cc4e 3 //Global Variables
lukeocarwright 14:9cfe0041cc4e 4 volatile extern uint16_t sin_wavtable[1024];
lukeocarwright 14:9cfe0041cc4e 5 volatile extern uint16_t tri_wavtable[1024];
lukeocarwright 14:9cfe0041cc4e 6 volatile extern uint16_t pulse_wavtable[1024];
lukeocarwright 14:9cfe0041cc4e 7
lukeocarwright 14:9cfe0041cc4e 8 //Constructor/Destructor
lukeocarwright 14:9cfe0041cc4e 9 Sound::Sound()
lukeocarwright 14:9cfe0041cc4e 10 {
lukeocarwright 14:9cfe0041cc4e 11 }
lukeocarwright 14:9cfe0041cc4e 12 Sound::~Sound()
lukeocarwright 14:9cfe0041cc4e 13 {
lukeocarwright 14:9cfe0041cc4e 14 }
lukeocarwright 14:9cfe0041cc4e 15
lukeocarwright 14:9cfe0041cc4e 16 //PUBLIC:-----------------------------------------------------------------------
lukeocarwright 14:9cfe0041cc4e 17
lukeocarwright 14:9cfe0041cc4e 18 uint16_t Sound::sound_main(bool initial, int waveform, int frequency)
lukeocarwright 14:9cfe0041cc4e 19 {
lukeocarwright 14:9cfe0041cc4e 20 if (initial==true) {
lukeocarwright 14:9cfe0041cc4e 21 i=0;
lukeocarwright 14:9cfe0041cc4e 22 return(i);
lukeocarwright 14:9cfe0041cc4e 23 }
lukeocarwright 15:1c67f064278e 24
lukeocarwright 14:9cfe0041cc4e 25 i=wavetable_itt(i,frequency);
lukeocarwright 15:1c67f064278e 26
lukeocarwright 14:9cfe0041cc4e 27 if (waveform==1) {
lukeocarwright 14:9cfe0041cc4e 28 #ifdef SLOW_TIME
lukeocarwright 18:204cd747b54a 29 printf("SIN_wavtable[%u]\n",i);
lukeocarwright 14:9cfe0041cc4e 30 #endif
lukeocarwright 14:9cfe0041cc4e 31 return (sin_wavtable[i]);
lukeocarwright 14:9cfe0041cc4e 32 }
lukeocarwright 15:1c67f064278e 33 if (waveform==2) {
lukeocarwright 15:1c67f064278e 34 #ifdef SLOW_TIME
lukeocarwright 18:204cd747b54a 35 printf("TRI_wavtable[%u]\n",i);
lukeocarwright 15:1c67f064278e 36 #endif
lukeocarwright 15:1c67f064278e 37 return (tri_wavtable[i]);
lukeocarwright 15:1c67f064278e 38 }
lukeocarwright 15:1c67f064278e 39 if (waveform==3) {
lukeocarwright 15:1c67f064278e 40 #ifdef SLOW_TIME
lukeocarwright 18:204cd747b54a 41 printf("SQR_wavtable[%u]\n",i);
lukeocarwright 15:1c67f064278e 42 #endif
lukeocarwright 15:1c67f064278e 43 return (pulse_wavtable[i]);
lukeocarwright 15:1c67f064278e 44 }
lukeocarwright 14:9cfe0041cc4e 45 return(0);
lukeocarwright 14:9cfe0041cc4e 46 }
lukeocarwright 14:9cfe0041cc4e 47
lukeocarwright 14:9cfe0041cc4e 48 //PRIVATE:----------------------------------------------------------------------
lukeocarwright 14:9cfe0041cc4e 49 uint16_t Sound::wavetable_itt(uint16_t i, int frequency)
lukeocarwright 14:9cfe0041cc4e 50 {
lukeocarwright 24:c3bb1b0b2207 51 i_d = i + ((1024*frequency)/ 10000); //i+((samples*f)*Ts)
lukeocarwright 14:9cfe0041cc4e 52 i=ceil(i_d); //ROUND IN FUTURE*************
lukeocarwright 14:9cfe0041cc4e 53
lukeocarwright 14:9cfe0041cc4e 54 if (i>=1024) {
lukeocarwright 14:9cfe0041cc4e 55 i=i-1024;
lukeocarwright 14:9cfe0041cc4e 56 }
lukeocarwright 14:9cfe0041cc4e 57 return(i);
lukeocarwright 14:9cfe0041cc4e 58 }