tmk_core/protocol/lufa/LUFA-git/Demos/Host/LowLevel/AudioOutputHost/AudioOutputHost.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2014.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2014  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 /** 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         GlobalInterruptEnable();
  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 #if (ARCH == ARCH_AVR8)
  61         /* Disable watchdog if enabled by bootloader/fuses */
  62         MCUSR &= ~(1 << WDRF);
  63         wdt_disable();
  64
  65         /* Disable clock division */
  66         clock_prescale_set(clock_div_1);
  67 #endif
  68
  69         /* Hardware Initialization */
  70         Serial_Init(9600, false);
  71         Buttons_Init();
  72         ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
  73         ADC_SetupChannel(MIC_IN_ADC_CHANNEL);
  74         LEDs_Init();
  75         USB_Init();
  76
  77         /* Create a stdio stream for the serial port for stdin and stdout */
  78         Serial_CreateStream(NULL);
  79
  80         /* Start the ADC conversion in free running mode */
  81         ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | ADC_GET_CHANNEL_MASK(MIC_IN_ADC_CHANNEL));
  82 }
  83
  84 /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
  85  *  starts the library USB task to begin the enumeration and USB management process.
  86  */
  87 void EVENT_USB_Host_DeviceAttached(void)
  88 {
  89         puts_P(PSTR(ESC_FG_GREEN "Device Attached.\r\n" ESC_FG_WHITE));
  90         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  91 }
  92
  93 /** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
  94  *  stops the library USB task management process.
  95  */
  96 void EVENT_USB_Host_DeviceUnattached(void)
  97 {
  98         puts_P(PSTR(ESC_FG_GREEN "Device Unattached.\r\n" ESC_FG_WHITE));
  99         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 100 }
 101
 102 /** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
 103  *  enumerated by the host and is now ready to be used by the application.
 104  */
 105 void EVENT_USB_Host_DeviceEnumerationComplete(void)
 106 {
 107         puts_P(PSTR("Getting Config Data.\r\n"));
 108
 109         uint8_t ErrorCode;
 110
 111         /* Get and process the configuration descriptor data */
 112         if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
 113         {
 114                 if (ErrorCode == ControlError)
 115                   puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
 116                 else
 117                   puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
 118
 119                 printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 120
 121                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 122                 return;
 123         }
 124
 125         /* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
 126         if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
 127         {
 128                 printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
 129                                          " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 130
 131                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 132                 return;
 133         }
 134
 135         if ((ErrorCode = USB_Host_SetInterfaceAltSetting(StreamingInterfaceIndex,
 136                                                          StreamingInterfaceAltSetting)) != HOST_SENDCONTROL_Successful)
 137         {
 138                 printf_P(PSTR(ESC_FG_RED "Could not set alternative streaming interface setting.\r\n"
 139                                          " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 140
 141                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 142                 USB_Host_SetDeviceConfiguration(0);
 143                 return;
 144         }
 145
 146         USB_ControlRequest = (USB_Request_Header_t)
 147                 {
 148                         .bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_ENDPOINT),
 149                         .bRequest      = AUDIO_REQ_SetCurrent,
 150                         .wValue        = (AUDIO_EPCONTROL_SamplingFreq << 8),
 151                         .wIndex        = StreamingEndpointAddress,
 152                         .wLength       = sizeof(USB_Audio_SampleFreq_t),
 153                 };
 154
 155         USB_Audio_SampleFreq_t SampleRate = AUDIO_SAMPLE_FREQ(48000);
 156
 157         /* Select the control pipe for the request transfer */
 158         Pipe_SelectPipe(PIPE_CONTROLPIPE);
 159
 160         /* Set the sample rate on the streaming interface endpoint */
 161         if ((ErrorCode = USB_Host_SendControlRequest(&SampleRate)) != HOST_SENDCONTROL_Successful)
 162         {
 163                 printf_P(PSTR(ESC_FG_RED "Could not set requested Audio sample rate.\r\n"
 164                                          " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 165
 166                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 167                 USB_Host_SetDeviceConfiguration(0);
 168                 return;
 169         }
 170
 171         /* Sample reload timer initialization */
 172         TIMSK0  = (1 << OCIE0A);
 173         OCR0A   = ((F_CPU / 8 / 48000) - 1);
 174         TCCR0A  = (1 << WGM01);  // CTC mode
 175         TCCR0B  = (1 << CS01);   // Fcpu/8 speed
 176
 177         puts_P(PSTR("Speaker Enumerated.\r\n"));
 178         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 179 }
 180
 181 /** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
 182 void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
 183 {
 184         USB_Disable();
 185
 186         printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
 187                                  " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
 188
 189         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 190         for(;;);
 191 }
 192
 193 /** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 194  *  enumerating an attached USB device.
 195  */
 196 void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
 197                                             const uint8_t SubErrorCode)
 198 {
 199         printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
 200                                  " -- Error Code %d\r\n"
 201                                  " -- Sub Error Code %d\r\n"
 202                                  " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
 203
 204         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 205 }
 206
 207 /** ISR to handle the reloading of the endpoint with the next sample. */
 208 ISR(TIMER0_COMPA_vect, ISR_BLOCK)
 209 {
 210         uint8_t PrevPipe = Pipe_GetCurrentPipe();
 211
 212         Pipe_SelectPipe(AUDIO_DATA_OUT_PIPE);
 213         Pipe_Unfreeze();
 214
 215         /* Check if the current pipe can be written to (device ready for more data) */
 216         if (Pipe_IsOUTReady())
 217         {
 218                 int16_t AudioSample;
 219
 220                 #if defined(USE_TEST_TONE)
 221                         static uint8_t SquareWaveSampleCount;
 222                         static int16_t CurrentWaveValue;
 223
 224                         /* In test tone mode, generate a square wave at 1/256 of the sample rate */
 225                         if (SquareWaveSampleCount++ == 0xFF)
 226                           CurrentWaveValue ^= 0x8000;
 227
 228                         /* Only generate audio if the board button is being pressed */
 229                         AudioSample = (Buttons_GetStatus() & BUTTONS_BUTTON1) ? CurrentWaveValue : 0;
 230                 #else
 231                         /* Audio sample is ADC value scaled to fit the entire range */
 232                         AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult());
 233
 234                         #if defined(MICROPHONE_BIASED_TO_HALF_RAIL)
 235                         /* Microphone is biased to half rail voltage, subtract the bias from the sample value */
 236                         AudioSample -= (SAMPLE_MAX_RANGE / 2);
 237                         #endif
 238                 #endif
 239
 240                 Pipe_Write_16_LE(AudioSample);
 241                 Pipe_Write_16_LE(AudioSample);
 242
 243                 if (!(Pipe_IsReadWriteAllowed()))
 244                   Pipe_ClearOUT();
 245         }
 246
 247         Pipe_Freeze();
 248         Pipe_SelectPipe(PrevPipe);
 249 }
 250