Demos/Host/ClassDriver/AudioInputHost/AudioInputHost.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 AudioInputHost demo. This file contains the main tasks of
  34  *  the demo and is responsible for the initial application hardware configuration.
  35  */
  36
  37 #include "AudioInputHost.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 Microphone_Audio_Interface =
  44         {
  45                 .Config =
  46                         {
  47                                 .DataINPipe             =
  48                                         {
  49                                                 .Address        = (PIPE_DIR_IN  | 1),
  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 Input Host Demo running.\r\n" ESC_FG_WHITE));
  63
  64         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  65         sei();
  66
  67         for (;;)
  68         {
  69                 Audio_Host_USBTask(&Microphone_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 read */
  80         if (Audio_Host_IsSampleReceived(&Microphone_Audio_Interface))
  81         {
  82                 /* Retrieve the signed 16-bit audio sample, convert to 8-bit */
  83                 int8_t Sample_8Bit = (Audio_Host_ReadSample16(&Microphone_Audio_Interface) >> 8);
  84
  85                 /* Load the sample into the PWM timer channel */
  86                 OCR3A = (Sample_8Bit ^ (1 << 7));
  87
  88                 uint8_t LEDMask = LEDS_NO_LEDS;
  89
  90                 /* Turn on LEDs as the sample amplitude increases */
  91                 if (Sample_8Bit > 16)
  92                   LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3 | LEDS_LED4);
  93                 else if (Sample_8Bit > 8)
  94                   LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3);
  95                 else if (Sample_8Bit > 4)
  96                   LEDMask = (LEDS_LED1 | LEDS_LED2);
  97                 else if (Sample_8Bit > 2)
  98                   LEDMask = (LEDS_LED1);
  99
 100                 LEDs_SetAllLEDs(LEDMask);
 101         }
 102
 103         Pipe_SelectPipe(PrevPipe);
 104 }
 105
 106 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 107 void SetupHardware(void)
 108 {
 109         /* Disable watchdog if enabled by bootloader/fuses */
 110         MCUSR &= ~(1 << WDRF);
 111         wdt_disable();
 112
 113         /* Disable clock division */
 114         clock_prescale_set(clock_div_1);
 115
 116         /* Hardware Initialization */
 117         Serial_Init(9600, false);
 118         LEDs_Init();
 119         USB_Init();
 120
 121         /* Create a stdio stream for the serial port for stdin and stdout */
 122         Serial_CreateStream(NULL);
 123 }
 124
 125 /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
 126  *  starts the library USB task to begin the enumeration and USB management process.
 127  */
 128 void EVENT_USB_Host_DeviceAttached(void)
 129 {
 130         puts_P(PSTR("Device Attached.\r\n"));
 131         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 132 }
 133
 134 /** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
 135  *  stops the library USB task management process.
 136  */
 137 void EVENT_USB_Host_DeviceUnattached(void)
 138 {
 139         puts_P(PSTR("\r\nDevice Unattached.\r\n"));
 140         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 141 }
 142
 143 /** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
 144  *  enumerated by the host and is now ready to be used by the application.
 145  */
 146 void EVENT_USB_Host_DeviceEnumerationComplete(void)
 147 {
 148         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 149
 150         uint16_t ConfigDescriptorSize;
 151         uint8_t  ConfigDescriptorData[512];
 152
 153         if (USB_Host_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData,
 154                                                sizeof(ConfigDescriptorData)) != HOST_GETCONFIG_Successful)
 155         {
 156                 puts_P(PSTR("Error Retrieving Configuration Descriptor.\r\n"));
 157                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 158                 return;
 159         }
 160
 161         if (Audio_Host_ConfigurePipes(&Microphone_Audio_Interface,
 162                                       ConfigDescriptorSize, ConfigDescriptorData) != AUDIO_ENUMERROR_NoError)
 163         {
 164                 puts_P(PSTR("Attached Device Not a Valid Audio Input Device.\r\n"));
 165                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 166                 return;
 167         }
 168
 169         if (USB_Host_SetDeviceConfiguration(1) != HOST_SENDCONTROL_Successful)
 170         {
 171                 puts_P(PSTR("Error Setting Device Configuration.\r\n"));
 172                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 173                 return;
 174         }
 175
 176         if (Audio_Host_StartStopStreaming(&Microphone_Audio_Interface, true) != HOST_SENDCONTROL_Successful)
 177         {
 178                 puts_P(PSTR("Error Enabling Audio Stream.\r\n"));
 179                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 180                 USB_Host_SetDeviceConfiguration(0);
 181                 return;
 182         }
 183
 184         USB_Audio_SampleFreq_t SampleRate = AUDIO_SAMPLE_FREQ(48000);
 185         if (Audio_Host_GetSetEndpointProperty(&Microphone_Audio_Interface, Microphone_Audio_Interface.Config.DataINPipe.Address,
 186                                               AUDIO_REQ_SetCurrent, AUDIO_EPCONTROL_SamplingFreq,
 187                                               sizeof(SampleRate), &SampleRate) != HOST_SENDCONTROL_Successful)
 188         {
 189                 puts_P(PSTR("Error Setting Audio Sampling Frequency.\r\n"));
 190                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 191                 USB_Host_SetDeviceConfiguration(0);
 192                 return;
 193         }
 194
 195         /* Sample reload timer initialization */
 196         TIMSK0  = (1 << OCIE0A);
 197         OCR0A   = ((F_CPU / 8 / 48000) - 1);
 198         TCCR0A  = (1 << WGM01);  // CTC mode
 199         TCCR0B  = (1 << CS01);   // Fcpu/8 speed
 200
 201         /* Set speaker as output */
 202         DDRC   |= (1 << 6);
 203
 204         /* PWM speaker timer initialization */
 205         TCCR3A  = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0)); // Set on match, clear on TOP
 206         TCCR3B  = ((1 << WGM32) | (1 << CS30));  // Fast 8-Bit PWM, F_CPU speed
 207
 208         puts_P(PSTR("Audio Device Enumerated.\r\n"));
 209         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 210 }
 211
 212 /** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
 213 void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
 214 {
 215         USB_Disable();
 216
 217         printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
 218                                  " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
 219
 220         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 221         for(;;);
 222 }
 223
 224 /** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 225  *  enumerating an attached USB device.
 226  */
 227 void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
 228                                             const uint8_t SubErrorCode)
 229 {
 230         printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
 231                                  " -- Error Code %d\r\n"
 232                                  " -- Sub Error Code %d\r\n"
 233                                  " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
 234
 235         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 236 }
 237