bryan wade / Mbed 2 deprecated usb_sound_effects

Streams USB audio with sound effects applied. Sound effect selected by joystick and intensity altered by tilting the mbed. Output to the mbed-application-board phono jack.

Dependencies:   C12832_lcd MMA7660 USBDevice mbed

/media/uploads/bw/img_1293.jpg 

/* Uses the mbed LPC1768 and mbed-application-board to create a USB audio device
 * that streams audio from a host computer to headphones or powered speakers. 
 * A couple different sound effects can be applied to the stream in real-time,
 * and tilting the mbed alters intensity of the effect.
 *
 *                                               ECHO
 *       The joystick selects )                   |
 *       one of three effect  )       STRAIGHT -  o  - STRAIGHT
 *       modes.               )                   |
 *                                              REVERB   
 * 
 *
 *
 *                                               \\           ||    
 *       Tilting the mbed     )      ======       \\          ||
 *       determines intensity )                    \\         ||
 *       of the effect.       )
 *                                     0%         50%         100%  
 *
 * The LCD display shows the current effect mode, intesity and buffer level.
*/

effects.h@2:9429f84ea165, 2014-03-27 (annotated)

Committer:
bw
Date:
Thu Mar 27 21:43:41 2014 +0000
Revision:
2:9429f84ea165
Parent:
0:bbf6cf0eab95 
Clean up comments.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bw 0:bbf6cf0eab95 1 /*******************************************************************************
bw 0:bbf6cf0eab95 2 * Module processes 16-bit audio samples to produces delay-based sound effects.
bw 0:bbf6cf0eab95 3 * Bryan Wade
bw 0:bbf6cf0eab95 4 * 27 MAR 2014
bw 0:bbf6cf0eab95 5 ******************************************************************************/
bw 0:bbf6cf0eab95 6 #ifndef EFFECTS_H
bw 0:bbf6cf0eab95 7 #define EFFECTS_H
bw 0:bbf6cf0eab95 8
bw 0:bbf6cf0eab95 9 #include <stdint.h>
bw 0:bbf6cf0eab95 10
bw 0:bbf6cf0eab95 11 // Practical gain limit for decent sound.
bw 0:bbf6cf0eab95 12 #define MAX_EFFECT_GAIN (58982)
bw 0:bbf6cf0eab95 13
bw 0:bbf6cf0eab95 14 // Available sound effect modes
bw 0:bbf6cf0eab95 15 typedef enum effect_mode_t {
bw 0:bbf6cf0eab95 16 EFFECT_STRAIGHT,
bw 0:bbf6cf0eab95 17 EFFECT_ECHO,
bw 0:bbf6cf0eab95 18 EFFECT_REVERB
bw 0:bbf6cf0eab95 19 } effect_mode_t;
bw 0:bbf6cf0eab95 20
bw 0:bbf6cf0eab95 21
bw 0:bbf6cf0eab95 22 // Initialize module.
bw 0:bbf6cf0eab95 23 void Effects_Initialize(void);
bw 0:bbf6cf0eab95 24
bw 0:bbf6cf0eab95 25 // Process one audio sample.
bw 0:bbf6cf0eab95 26 int16_t Effects_ProcessSample(int16_t dataIn);
bw 0:bbf6cf0eab95 27
bw 0:bbf6cf0eab95 28 void Effects_SetMode(effect_mode_t mode);
bw 0:bbf6cf0eab95 29
bw 0:bbf6cf0eab95 30 void Effects_SetGain(uint16_t gain);
bw 0:bbf6cf0eab95 31
bw 0:bbf6cf0eab95 32 #endif