Demos/Host/ClassDriver/AudioOutputHost/AudioOutputHost.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2011.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2011  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 disclaim 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                                 .DataOUTPipeNumber = 1,
  48                         },
  49         };
  50
  51
  52 /** Main program entry point. This routine configures the hardware required by the application, then
  53  *  enters a loop to run the application tasks in sequence.
  54  */
  55 int main(void)
  56 {
  57         SetupHardware();
  58
  59         puts_P(PSTR(ESC_FG_CYAN "Audio Output Host Demo running.\r\n" ESC_FG_WHITE));
  60
  61         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  62         sei();
  63
  64         for (;;)
  65         {
  66                 Audio_Host_USBTask(&Speaker_Audio_Interface);
  67                 USB_USBTask();
  68         }
  69 }
  70
  71 /** ISR to handle the reloading of the PWM timer with the next sample. */
  72 ISR(TIMER0_COMPA_vect, ISR_BLOCK)
  73 {
  74         uint8_t PrevPipe = Pipe_GetCurrentPipe();
  75
  76         /* Check that the USB bus is ready for the next sample to write */
  77         if (Audio_Host_IsReadyForNextSample(&Speaker_Audio_Interface))
  78         {
  79                 int16_t AudioSample;
  80
  81                 #if defined(USE_TEST_TONE)
  82                         static uint8_t SquareWaveSampleCount;
  83                         static int16_t CurrentWaveValue;
  84
  85                         /* In test tone mode, generate a square wave at 1/256 of the sample rate */
  86                         if (SquareWaveSampleCount++ == 0xFF)
  87                           CurrentWaveValue ^= 0x8000;
  88
  89                         /* Only generate audio if the board button is being pressed */
  90                         AudioSample = (Buttons_GetStatus() & BUTTONS_BUTTON1) ? CurrentWaveValue : 0;
  91                 #else
  92                         /* Audio sample is ADC value scaled to fit the entire range */
  93                         AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult());
  94
  95                         #if defined(MICROPHONE_BIASED_TO_HALF_RAIL)
  96                         /* Microphone is biased to half rail voltage, subtract the bias from the sample value */
  97                         AudioSample -= (SAMPLE_MAX_RANGE / 2);
  98                         #endif
  99                 #endif
 100
 101                 Audio_Host_WriteSample16(&Speaker_Audio_Interface, AudioSample);
 102                 Audio_Host_WriteSample16(&Speaker_Audio_Interface, AudioSample);
 103         }
 104
 105         Pipe_SelectPipe(PrevPipe);
 106 }
 107
 108 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 109 void SetupHardware(void)
 110 {
 111         /* Disable watchdog if enabled by bootloader/fuses */
 112         MCUSR &= ~(1 << WDRF);
 113         wdt_disable();
 114
 115         /* Disable clock division */
 116         clock_prescale_set(clock_div_1);
 117
 118         /* Hardware Initialization */
 119         Serial_Init(9600, false);
 120         LEDs_Init();
 121         Buttons_Init();
 122         ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
 123         ADC_SetupChannel(MIC_IN_ADC_CHANNEL);
 124         USB_Init();
 125
 126         /* Create a stdio stream for the serial port for stdin and stdout */
 127         Serial_CreateStream(NULL);
 128 }
 129
 130 /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
 131  *  starts the library USB task to begin the enumeration and USB management process.
 132  */
 133 void EVENT_USB_Host_DeviceAttached(void)
 134 {
 135         puts_P(PSTR("Device Attached.\r\n"));
 136         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 137 }
 138
 139 /** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
 140  *  stops the library USB task management process.
 141  */
 142 void EVENT_USB_Host_DeviceUnattached(void)
 143 {
 144         puts_P(PSTR("\r\nDevice Unattached.\r\n"));
 145         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 146 }
 147
 148 /** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
 149  *  enumerated by the host and is now ready to be used by the application.
 150  */
 151 void EVENT_USB_Host_DeviceEnumerationComplete(void)
 152 {
 153         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 154
 155         uint16_t ConfigDescriptorSize;
 156         uint8_t  ConfigDescriptorData[512];
 157
 158         if (USB_Host_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData,
 159                                                sizeof(ConfigDescriptorData)) != HOST_GETCONFIG_Successful)
 160         {
 161                 puts_P(PSTR("Error Retrieving Configuration Descriptor.\r\n"));
 162                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 163                 return;
 164         }
 165
 166         if (Audio_Host_ConfigurePipes(&Speaker_Audio_Interface,
 167                                       ConfigDescriptorSize, ConfigDescriptorData) != AUDIO_ENUMERROR_NoError)
 168         {
 169                 puts_P(PSTR("Attached Device Not a Valid Audio Output Device.\r\n"));
 170                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 171                 return;
 172         }
 173
 174         if (USB_Host_SetDeviceConfiguration(1) != HOST_SENDCONTROL_Successful)
 175         {
 176                 puts_P(PSTR("Error Setting Device Configuration.\r\n"));
 177                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 178                 return;
 179         }
 180
 181         if (Audio_Host_StartStopStreaming(&Speaker_Audio_Interface, true) != HOST_SENDCONTROL_Successful)
 182         {
 183                 puts_P(PSTR("Error Enabling Audio Stream.\r\n"));
 184                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 185                 USB_Host_SetDeviceConfiguration(0);
 186                 return;
 187         }
 188
 189         USB_Audio_SampleFreq_t SampleRate = AUDIO_SAMPLE_FREQ(48000);
 190         if (Audio_Host_GetSetEndpointProperty(&Speaker_Audio_Interface, Speaker_Audio_Interface.Config.DataOUTPipeNumber,
 191                                               AUDIO_REQ_SetCurrent, AUDIO_EPCONTROL_SamplingFreq,
 192                                               sizeof(SampleRate), &SampleRate) != HOST_SENDCONTROL_Successful)
 193         {
 194                 puts_P(PSTR("Error Setting Audio Sampling Frequency.\r\n"));
 195                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 196                 USB_Host_SetDeviceConfiguration(0);
 197                 return;
 198         }
 199
 200         /* Sample reload timer initialization */
 201         TIMSK0  = (1 << OCIE0A);
 202         OCR0A   = ((F_CPU / 8 / 48000) - 1);
 203         TCCR0A  = (1 << WGM01);  // CTC mode
 204         TCCR0B  = (1 << CS01);   // Fcpu/8 speed
 205
 206         puts_P(PSTR("Audio Device Enumerated.\r\n"));
 207         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 208 }
 209
 210 /** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
 211 void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
 212 {
 213         USB_Disable();
 214
 215         printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
 216                                  " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
 217
 218         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 219         for(;;);
 220 }
 221
 222 /** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 223  *  enumerating an attached USB device.
 224  */
 225 void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
 226                                             const uint8_t SubErrorCode)
 227 {
 228         printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
 229                                  " -- Error Code %d\r\n"
 230                                  " -- Sub Error Code %d\r\n"
 231                                  " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
 232
 233         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 234 }
 235