bryan wade
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
/* 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. */
Diff: user_interface.cpp
- Revision:
- 0:bbf6cf0eab95
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/user_interface.cpp Thu Mar 27 21:27:04 2014 +0000
@@ -0,0 +1,122 @@
+/*******************************************************************************
+ * Mangages LCD display, joystick and accelerometer for user interface.
+ * Bryan Wade
+ * 27 MAR 2014
+ ******************************************************************************/
+#include "mbed.h"
+#include "C12832_lcd.h"
+#include "MMA7660.h"
+#include "user_interface.h"
+#include "effects.h"
+
+C12832_LCD lcd;
+MMA7660 accel(p28, p27, true);
+BusIn joystick(p15, p12, p13, p16);
+AnalogIn pot(p19);
+
+static const int STICK_IDLE = 0;
+static const int STICK_UP = 1;
+static const int STICK_DOWN = 2;
+static const int STICK_LEFT = 4;
+static const int STICK_RIGHT = 8;
+
+static uint8_t stickPrevious;
+static effect_mode_t selectedMode;
+static char *selectedModeName;
+static uint16_t effectGain;
+
+/*
+ * Update the display with mode, gain and buffer level.
+ */
+void updateDisplay(int32_t level)
+{
+ lcd.locate(0,0);
+ lcd.printf("Effect: %s ", selectedModeName);
+
+ lcd.locate(0,10);
+ lcd.printf("Intensity: %d ", effectGain / (MAX_EFFECT_GAIN / 100));
+
+ lcd.locate(0,20);
+ lcd.printf("Buffer: %d ", level);
+}
+
+/*
+ * Get effects mode selected by joystick.
+ */
+void serviceJoystick(void)
+{
+ uint8_t stick = joystick;
+
+ if (stick != stickPrevious) {
+ stickPrevious = stick;
+
+ switch (stick)
+ {
+ case STICK_UP:
+ selectedMode = EFFECT_ECHO;
+ selectedModeName = "Echo";
+ break;
+
+ case STICK_DOWN:
+ selectedMode = EFFECT_REVERB;
+ selectedModeName = "Reverb";
+ break;
+
+ case STICK_LEFT:
+ case STICK_RIGHT:
+ selectedMode = EFFECT_STRAIGHT;
+ selectedModeName = "Straight";
+ break;
+ }
+ }
+}
+
+/*
+ * Get effects gain from accelerometer tilt.
+ */
+ void serviceAccel(void)
+ {
+ // Tilt sensitivity selected to produce max effect gain
+ // at about 80 deg tilt.
+ static const int32_t TILT_SENSITIVITY = 2750;
+ int a[3];
+ accel.readData(a);
+ //Convert x-axis raw accelerometer data to the effect gain.
+ int32_t x = a[0] * TILT_SENSITIVITY;
+ if (x < 0) x = -x;
+ if (x > MAX_EFFECT_GAIN) x = MAX_EFFECT_GAIN;
+ effectGain = (uint16_t)x;
+ }
+
+/*
+ * Initialize the joystick and display.
+ */
+void UI_Initialize(void)
+{
+ lcd.cls();
+ stickPrevious = STICK_IDLE;
+ selectedMode = EFFECT_STRAIGHT;
+ selectedModeName = "Straight";
+ effectGain = 0;
+ // Set the accelerometer to sample slightly
+ // faster than we poll the user interface.
+ accel.setSampleRate(32);
+}
+
+/*
+ * Updates display, joystick and accelerometer
+ */
+void UI_Update(int32_t bufferLevel)
+{
+ serviceJoystick();
+ serviceAccel();
+ updateDisplay(bufferLevel);
+}
+
+
+effect_mode_t UI_GetEffectMode(void) { return selectedMode; }
+
+uint16_t UI_GetEffectGain(void) { return effectGain; }
+
+
+