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.
*/

user_interface.cpp@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 * Mangages LCD display, joystick and accelerometer for user interface.
bw 0:bbf6cf0eab95 3 * Bryan Wade
bw 0:bbf6cf0eab95 4 * 27 MAR 2014
bw 0:bbf6cf0eab95 5 ******************************************************************************/
bw 0:bbf6cf0eab95 6 #include "mbed.h"
bw 0:bbf6cf0eab95 7 #include "C12832_lcd.h"
bw 0:bbf6cf0eab95 8 #include "MMA7660.h"
bw 0:bbf6cf0eab95 9 #include "user_interface.h"
bw 0:bbf6cf0eab95 10 #include "effects.h"
bw 0:bbf6cf0eab95 11
bw 0:bbf6cf0eab95 12 C12832_LCD lcd;
bw 0:bbf6cf0eab95 13 MMA7660 accel(p28, p27, true);
bw 0:bbf6cf0eab95 14 BusIn joystick(p15, p12, p13, p16);
bw 0:bbf6cf0eab95 15 AnalogIn pot(p19);
bw 0:bbf6cf0eab95 16
bw 0:bbf6cf0eab95 17 static const int STICK_IDLE = 0;
bw 0:bbf6cf0eab95 18 static const int STICK_UP = 1;
bw 0:bbf6cf0eab95 19 static const int STICK_DOWN = 2;
bw 0:bbf6cf0eab95 20 static const int STICK_LEFT = 4;
bw 0:bbf6cf0eab95 21 static const int STICK_RIGHT = 8;
bw 0:bbf6cf0eab95 22
bw 0:bbf6cf0eab95 23 static uint8_t stickPrevious;
bw 0:bbf6cf0eab95 24 static effect_mode_t selectedMode;
bw 0:bbf6cf0eab95 25 static char *selectedModeName;
bw 0:bbf6cf0eab95 26 static uint16_t effectGain;
bw 0:bbf6cf0eab95 27
bw 0:bbf6cf0eab95 28 /*
bw 0:bbf6cf0eab95 29 * Update the display with mode, gain and buffer level.
bw 0:bbf6cf0eab95 30 */
bw 0:bbf6cf0eab95 31 void updateDisplay(int32_t level)
bw 0:bbf6cf0eab95 32 {
bw 0:bbf6cf0eab95 33 lcd.locate(0,0);
bw 0:bbf6cf0eab95 34 lcd.printf("Effect: %s ", selectedModeName);
bw 0:bbf6cf0eab95 35
bw 0:bbf6cf0eab95 36 lcd.locate(0,10);
bw 0:bbf6cf0eab95 37 lcd.printf("Intensity: %d ", effectGain / (MAX_EFFECT_GAIN / 100));
bw 0:bbf6cf0eab95 38
bw 0:bbf6cf0eab95 39 lcd.locate(0,20);
bw 0:bbf6cf0eab95 40 lcd.printf("Buffer: %d ", level);
bw 0:bbf6cf0eab95 41 }
bw 0:bbf6cf0eab95 42
bw 0:bbf6cf0eab95 43 /*
bw 0:bbf6cf0eab95 44 * Get effects mode selected by joystick.
bw 0:bbf6cf0eab95 45 */
bw 0:bbf6cf0eab95 46 void serviceJoystick(void)
bw 0:bbf6cf0eab95 47 {
bw 0:bbf6cf0eab95 48 uint8_t stick = joystick;
bw 0:bbf6cf0eab95 49
bw 0:bbf6cf0eab95 50 if (stick != stickPrevious) {
bw 0:bbf6cf0eab95 51 stickPrevious = stick;
bw 0:bbf6cf0eab95 52
bw 0:bbf6cf0eab95 53 switch (stick)
bw 0:bbf6cf0eab95 54 {
bw 0:bbf6cf0eab95 55 case STICK_UP:
bw 0:bbf6cf0eab95 56 selectedMode = EFFECT_ECHO;
bw 0:bbf6cf0eab95 57 selectedModeName = "Echo";
bw 0:bbf6cf0eab95 58 break;
bw 0:bbf6cf0eab95 59
bw 0:bbf6cf0eab95 60 case STICK_DOWN:
bw 0:bbf6cf0eab95 61 selectedMode = EFFECT_REVERB;
bw 0:bbf6cf0eab95 62 selectedModeName = "Reverb";
bw 0:bbf6cf0eab95 63 break;
bw 0:bbf6cf0eab95 64
bw 0:bbf6cf0eab95 65 case STICK_LEFT:
bw 0:bbf6cf0eab95 66 case STICK_RIGHT:
bw 0:bbf6cf0eab95 67 selectedMode = EFFECT_STRAIGHT;
bw 0:bbf6cf0eab95 68 selectedModeName = "Straight";
bw 0:bbf6cf0eab95 69 break;
bw 0:bbf6cf0eab95 70 }
bw 0:bbf6cf0eab95 71 }
bw 0:bbf6cf0eab95 72 }
bw 0:bbf6cf0eab95 73
bw 0:bbf6cf0eab95 74 /*
bw 0:bbf6cf0eab95 75 * Get effects gain from accelerometer tilt.
bw 0:bbf6cf0eab95 76 */
bw 0:bbf6cf0eab95 77 void serviceAccel(void)
bw 0:bbf6cf0eab95 78 {
bw 0:bbf6cf0eab95 79 // Tilt sensitivity selected to produce max effect gain
bw 0:bbf6cf0eab95 80 // at about 80 deg tilt.
bw 0:bbf6cf0eab95 81 static const int32_t TILT_SENSITIVITY = 2750;
bw 0:bbf6cf0eab95 82 int a[3];
bw 0:bbf6cf0eab95 83 accel.readData(a);
bw 0:bbf6cf0eab95 84 //Convert x-axis raw accelerometer data to the effect gain.
bw 0:bbf6cf0eab95 85 int32_t x = a[0] * TILT_SENSITIVITY;
bw 0:bbf6cf0eab95 86 if (x < 0) x = -x;
bw 0:bbf6cf0eab95 87 if (x > MAX_EFFECT_GAIN) x = MAX_EFFECT_GAIN;
bw 0:bbf6cf0eab95 88 effectGain = (uint16_t)x;
bw 0:bbf6cf0eab95 89 }
bw 0:bbf6cf0eab95 90
bw 0:bbf6cf0eab95 91 /*
bw 0:bbf6cf0eab95 92 * Initialize the joystick and display.
bw 0:bbf6cf0eab95 93 */
bw 0:bbf6cf0eab95 94 void UI_Initialize(void)
bw 0:bbf6cf0eab95 95 {
bw 0:bbf6cf0eab95 96 lcd.cls();
bw 0:bbf6cf0eab95 97 stickPrevious = STICK_IDLE;
bw 0:bbf6cf0eab95 98 selectedMode = EFFECT_STRAIGHT;
bw 0:bbf6cf0eab95 99 selectedModeName = "Straight";
bw 0:bbf6cf0eab95 100 effectGain = 0;
bw 0:bbf6cf0eab95 101 // Set the accelerometer to sample slightly
bw 0:bbf6cf0eab95 102 // faster than we poll the user interface.
bw 0:bbf6cf0eab95 103 accel.setSampleRate(32);
bw 0:bbf6cf0eab95 104 }
bw 0:bbf6cf0eab95 105
bw 0:bbf6cf0eab95 106 /*
bw 0:bbf6cf0eab95 107 * Updates display, joystick and accelerometer
bw 0:bbf6cf0eab95 108 */
bw 0:bbf6cf0eab95 109 void UI_Update(int32_t bufferLevel)
bw 0:bbf6cf0eab95 110 {
bw 0:bbf6cf0eab95 111 serviceJoystick();
bw 0:bbf6cf0eab95 112 serviceAccel();
bw 0:bbf6cf0eab95 113 updateDisplay(bufferLevel);
bw 0:bbf6cf0eab95 114 }
bw 0:bbf6cf0eab95 115
bw 0:bbf6cf0eab95 116
bw 0:bbf6cf0eab95 117 effect_mode_t UI_GetEffectMode(void) { return selectedMode; }
bw 0:bbf6cf0eab95 118
bw 0:bbf6cf0eab95 119 uint16_t UI_GetEffectGain(void) { return effectGain; }
bw 0:bbf6cf0eab95 120
bw 0:bbf6cf0eab95 121
bw 0:bbf6cf0eab95 122