Demos/Host/ClassDriver/AudioOutputHost/AudioOutputHost.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2013.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2013  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaims all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  Main source file for the AudioOutputHost demo. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "AudioOutputHost.h"
  38
  39 /** LUFA Audio Class driver interface configuration and state information. This structure is
  40  *  passed to all Audio Class driver functions, so that multiple instances of the same class
  41  *  within a device can be differentiated from one another.
  42  */
  43 USB_ClassInfo_Audio_Host_t Speaker_Audio_Interface =
  44         {
  45                 .Config =
  46                         {
  47                                 .DataOUTPipe            =
  48                                         {
  49                                                 .Address        = (PIPE_DIR_OUT | 2),
  50                                         },
  51                         },
  52         };
  53
  54
  55 /** Main program entry point. This routine configures the hardware required by the application, then
  56  *  enters a loop to run the application tasks in sequence.
  57  */
  58 int main(void)
  59 {
  60         SetupHardware();
  61
  62         puts_P(PSTR(ESC_FG_CYAN "Audio Output Host Demo running.\r\n" ESC_FG_WHITE));
  63
  64         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  65         GlobalInterruptEnable();
  66
  67         for (;;)
  68         {
  69                 Audio_Host_USBTask(&Speaker_Audio_Interface);
  70                 USB_USBTask();
  71         }
  72 }
  73
  74 /** ISR to handle the reloading of the PWM timer with the next sample. */
  75 ISR(TIMER0_COMPA_vect, ISR_BLOCK)
  76 {
  77         uint8_t PrevPipe = Pipe_GetCurrentPipe();
  78
  79         /* Check that the USB bus is ready for the next sample to write */
  80         if (Audio_Host_IsReadyForNextSample(&Speaker_Audio_Interface))
  81         {
  82                 int16_t AudioSample;
  83
  84                 #if defined(USE_TEST_TONE)
  85                         static uint8_t SquareWaveSampleCount;
  86                         static int16_t CurrentWaveValue;
  87
  88                         /* In test tone mode, generate a square wave at 1/256 of the sample rate */
  89                         if (SquareWaveSampleCount++ == 0xFF)
  90                           CurrentWaveValue ^= 0x8000;
  91
  92                         /* Only generate audio if the board button is being pressed */
  93                         AudioSample = (Buttons_GetStatus() & BUTTONS_BUTTON1) ? CurrentWaveValue : 0;
  94                 #else
  95                         /* Audio sample is ADC value scaled to fit the entire range */
  96                         AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult());
  97
  98                         #if defined(MICROPHONE_BIASED_TO_HALF_RAIL)
  99                         /* Microphone is biased to half rail voltage, subtract the bias from the sample value */
 100                         AudioSample -= (SAMPLE_MAX_RANGE / 2);
 101                         #endif
 102                 #endif
 103
 104                 Audio_Host_WriteSample16(&Speaker_Audio_Interface, AudioSample);
 105                 Audio_Host_WriteSample16(&Speaker_Audio_Interface, AudioSample);
 106         }
 107
 108         Pipe_SelectPipe(PrevPipe);
 109 }
 110
 111 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 112 void SetupHardware(void)
 113 {
 114         /* Disable watchdog if enabled by bootloader/fuses */
 115         MCUSR &= ~(1 << WDRF);
 116         wdt_disable();
 117
 118         /* Disable clock division */
 119         clock_prescale_set(clock_div_1);
 120
 121         /* Hardware Initialization */
 122         Serial_Init(9600, false);
 123         LEDs_Init();
 124         Buttons_Init();
 125         ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
 126         ADC_SetupChannel(MIC_IN_ADC_CHANNEL);
 127         USB_Init();
 128
 129         /* Create a stdio stream for the serial port for stdin and stdout */
 130         Serial_CreateStream(NULL);
 131
 132         /* Start the ADC conversion in free running mode */
 133         ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | ADC_GET_CHANNEL_MASK(MIC_IN_ADC_CHANNEL));
 134 }
 135
 136 /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
 137  *  starts the library USB task to begin the enumeration and USB management process.
 138  */
 139 void EVENT_USB_Host_DeviceAttached(void)
 140 {
 141         puts_P(PSTR("Device Attached.\r\n"));
 142         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 143 }
 144
 145 /** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
 146  *  stops the library USB task management process.
 147  */
 148 void EVENT_USB_Host_DeviceUnattached(void)
 149 {
 150         puts_P(PSTR("\r\nDevice Unattached.\r\n"));
 151         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 152 }
 153
 154 /** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
 155  *  enumerated by the host and is now ready to be used by the application.
 156  */
 157 void EVENT_USB_Host_DeviceEnumerationComplete(void)
 158 {
 159         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 160
 161         uint16_t ConfigDescriptorSize;
 162         uint8_t  ConfigDescriptorData[512];
 163
 164         if (USB_Host_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData,
 165                                                sizeof(ConfigDescriptorData)) != HOST_GETCONFIG_Successful)
 166         {
 167                 puts_P(PSTR("Error Retrieving Configuration Descriptor.\r\n"));
 168                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 169                 return;
 170         }
 171
 172         if (Audio_Host_ConfigurePipes(&Speaker_Audio_Interface,
 173                                       ConfigDescriptorSize, ConfigDescriptorData) != AUDIO_ENUMERROR_NoError)
 174         {
 175                 puts_P(PSTR("Attached Device Not a Valid Audio Output Device.\r\n"));
 176                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 177                 return;
 178         }
 179
 180         if (USB_Host_SetDeviceConfiguration(1) != HOST_SENDCONTROL_Successful)
 181         {
 182                 puts_P(PSTR("Error Setting Device Configuration.\r\n"));
 183                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 184                 return;
 185         }
 186
 187         if (Audio_Host_StartStopStreaming(&Speaker_Audio_Interface, true) != HOST_SENDCONTROL_Successful)
 188         {
 189                 puts_P(PSTR("Error Enabling Audio Stream.\r\n"));
 190                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 191                 USB_Host_SetDeviceConfiguration(0);
 192                 return;
 193         }
 194
 195         USB_Audio_SampleFreq_t SampleRate = AUDIO_SAMPLE_FREQ(48000);
 196         if (Audio_Host_GetSetEndpointProperty(&Speaker_Audio_Interface, Speaker_Audio_Interface.Config.DataOUTPipe.Address,
 197                                               AUDIO_REQ_SetCurrent, AUDIO_EPCONTROL_SamplingFreq,
 198                                               sizeof(SampleRate), &SampleRate) != HOST_SENDCONTROL_Successful)
 199         {
 200                 puts_P(PSTR("Error Setting Audio Sampling Frequency.\r\n"));
 201                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 202                 USB_Host_SetDeviceConfiguration(0);
 203                 return;
 204         }
 205
 206         /* Sample reload timer initialization */
 207         TIMSK0  = (1 << OCIE0A);
 208         OCR0A   = ((F_CPU / 8 / 48000) - 1);
 209         TCCR0A  = (1 << WGM01);  // CTC mode
 210         TCCR0B  = (1 << CS01);   // Fcpu/8 speed
 211
 212         puts_P(PSTR("Audio Device Enumerated.\r\n"));
 213         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 214 }
 215
 216 /** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
 217 void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
 218 {
 219         USB_Disable();
 220
 221         printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
 222                                  " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
 223
 224         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 225         for(;;);
 226 }
 227
 228 /** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 229  *  enumerating an attached USB device.
 230  */
 231 void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
 232                                             const uint8_t SubErrorCode)
 233 {
 234         printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
 235                                  " -- Error Code %d\r\n"
 236                                  " -- Sub Error Code %d\r\n"
 237                                  " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
 238
 239         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 240 }
 241