Demos/Host/LowLevel/AudioOutputHost/AudioOutputHost.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2012.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2012  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 /** Main program entry point. This routine configures the hardware required by the application, then
  40  *  enters a loop to run the application tasks in sequence.
  41  */
  42 int main(void)
  43 {
  44         SetupHardware();
  45
  46         puts_P(PSTR(ESC_FG_CYAN "Audio Output Host Demo running.\r\n" ESC_FG_WHITE));
  47
  48         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  49         sei();
  50
  51         for (;;)
  52         {
  53                 USB_USBTask();
  54         }
  55 }
  56
  57 /** Configures the board hardware and chip peripherals for the demo's functionality. */
  58 void SetupHardware(void)
  59 {
  60         /* Disable watchdog if enabled by bootloader/fuses */
  61         MCUSR &= ~(1 << WDRF);
  62         wdt_disable();
  63
  64         /* Disable clock division */
  65         clock_prescale_set(clock_div_1);
  66
  67         /* Hardware Initialization */
  68         Serial_Init(9600, false);
  69         Buttons_Init();
  70         ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
  71         ADC_SetupChannel(MIC_IN_ADC_CHANNEL);
  72         LEDs_Init();
  73         USB_Init();
  74
  75         /* Create a stdio stream for the serial port for stdin and stdout */
  76         Serial_CreateStream(NULL);
  77 }
  78
  79 /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
  80  *  starts the library USB task to begin the enumeration and USB management process.
  81  */
  82 void EVENT_USB_Host_DeviceAttached(void)
  83 {
  84         puts_P(PSTR(ESC_FG_GREEN "Device Attached.\r\n" ESC_FG_WHITE));
  85         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  86 }
  87
  88 /** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
  89  *  stops the library USB task management process.
  90  */
  91 void EVENT_USB_Host_DeviceUnattached(void)
  92 {
  93         puts_P(PSTR(ESC_FG_GREEN "Device Unattached.\r\n" ESC_FG_WHITE));
  94         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  95 }
  96
  97 /** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
  98  *  enumerated by the host and is now ready to be used by the application.
  99  */
 100 void EVENT_USB_Host_DeviceEnumerationComplete(void)
 101 {
 102         puts_P(PSTR("Getting Config Data.\r\n"));
 103
 104         uint8_t ErrorCode;
 105
 106         /* Get and process the configuration descriptor data */
 107         if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
 108         {
 109                 if (ErrorCode == ControlError)
 110                   puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
 111                 else
 112                   puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
 113
 114                 printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 115
 116                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 117                 return;
 118         }
 119
 120         /* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
 121         if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
 122         {
 123                 printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
 124                                          " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 125
 126                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 127                 return;
 128         }
 129
 130         if ((ErrorCode = USB_Host_SetInterfaceAltSetting(StreamingInterfaceIndex,
 131                                                          StreamingInterfaceAltSetting)) != HOST_SENDCONTROL_Successful)
 132         {
 133                 printf_P(PSTR(ESC_FG_RED "Could not set alternative streaming interface setting.\r\n"
 134                                          " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 135
 136                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 137                 USB_Host_SetDeviceConfiguration(0);
 138                 return;
 139         }
 140
 141         USB_ControlRequest = (USB_Request_Header_t)
 142                 {
 143                         .bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_ENDPOINT),
 144                         .bRequest      = AUDIO_REQ_SetCurrent,
 145                         .wValue        = (AUDIO_EPCONTROL_SamplingFreq << 8),
 146                         .wIndex        = StreamingEndpointAddress,
 147                         .wLength       = sizeof(USB_Audio_SampleFreq_t),
 148                 };
 149
 150         USB_Audio_SampleFreq_t SampleRate = AUDIO_SAMPLE_FREQ(48000);
 151
 152         /* Select the control pipe for the request transfer */
 153         Pipe_SelectPipe(PIPE_CONTROLPIPE);
 154
 155         /* Set the sample rate on the streaming interface endpoint */
 156         if ((ErrorCode = USB_Host_SendControlRequest(&SampleRate)) != HOST_SENDCONTROL_Successful)
 157         {
 158                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 159                 USB_Host_SetDeviceConfiguration(0);
 160                 return;
 161         }
 162
 163         /* Sample reload timer initialization */
 164         TIMSK0  = (1 << OCIE0A);
 165         OCR0A   = ((F_CPU / 8 / 48000) - 1);
 166         TCCR0A  = (1 << WGM01);  // CTC mode
 167         TCCR0B  = (1 << CS01);   // Fcpu/8 speed
 168
 169         puts_P(PSTR("Speaker Enumerated.\r\n"));
 170         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 171 }
 172
 173 /** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
 174 void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
 175 {
 176         USB_Disable();
 177
 178         printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
 179                                  " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
 180
 181         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 182         for(;;);
 183 }
 184
 185 /** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 186  *  enumerating an attached USB device.
 187  */
 188 void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
 189                                             const uint8_t SubErrorCode)
 190 {
 191         printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
 192                                  " -- Error Code %d\r\n"
 193                                  " -- Sub Error Code %d\r\n"
 194                                  " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
 195
 196         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 197 }
 198
 199 /** ISR to handle the reloading of the endpoint with the next sample. */
 200 ISR(TIMER0_COMPA_vect, ISR_BLOCK)
 201 {
 202         uint8_t PrevPipe = Pipe_GetCurrentPipe();
 203
 204         Pipe_SelectPipe(AUDIO_DATA_OUT_PIPE);
 205         Pipe_Unfreeze();
 206
 207         /* Check if the current pipe can be written to (device ready for more data) */
 208         if (Pipe_IsOUTReady())
 209         {
 210                 int16_t AudioSample;
 211
 212                 #if defined(USE_TEST_TONE)
 213                         static uint8_t SquareWaveSampleCount;
 214                         static int16_t CurrentWaveValue;
 215
 216                         /* In test tone mode, generate a square wave at 1/256 of the sample rate */
 217                         if (SquareWaveSampleCount++ == 0xFF)
 218                           CurrentWaveValue ^= 0x8000;
 219
 220                         /* Only generate audio if the board button is being pressed */
 221                         AudioSample = (Buttons_GetStatus() & BUTTONS_BUTTON1) ? CurrentWaveValue : 0;
 222                 #else
 223                         /* Audio sample is ADC value scaled to fit the entire range */
 224                         AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult());
 225
 226                         #if defined(MICROPHONE_BIASED_TO_HALF_RAIL)
 227                         /* Microphone is biased to half rail voltage, subtract the bias from the sample value */
 228                         AudioSample -= (SAMPLE_MAX_RANGE / 2);
 229                         #endif
 230                 #endif
 231
 232                 Pipe_Write_16_LE(AudioSample);
 233                 Pipe_Write_16_LE(AudioSample);
 234
 235                 if (!(Pipe_IsReadWriteAllowed()))
 236                   Pipe_ClearOUT();
 237         }
 238
 239         Pipe_Freeze();
 240         Pipe_SelectPipe(PrevPipe);
 241 }
 242