Demos/Host/ClassDriver/AudioInputHost/AudioInputHost.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 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                                 .DataINPipeNumber = 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 Input Host Demo running.\r\n" ESC_FG_WHITE));
  60
  61         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  62         sei();
  63
  64         for (;;)
  65         {
  66                 switch (USB_HostState)
  67                 {
  68                         case HOST_STATE_Addressed:
  69                                 LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  70
  71                                 uint16_t ConfigDescriptorSize;
  72                                 uint8_t  ConfigDescriptorData[512];
  73
  74                                 if (USB_Host_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData,
  75                                                                        sizeof(ConfigDescriptorData)) != HOST_GETCONFIG_Successful)
  76                                 {
  77                                         puts_P(PSTR("Error Retrieving Configuration Descriptor.\r\n"));
  78                                         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
  79                                         USB_HostState = HOST_STATE_WaitForDeviceRemoval;
  80                                         break;
  81                                 }
  82
  83                                 if (Audio_Host_ConfigurePipes(&Microphone_Audio_Interface,
  84                                                               ConfigDescriptorSize, ConfigDescriptorData) != AUDIO_ENUMERROR_NoError)
  85                                 {
  86                                         puts_P(PSTR("Attached Device Not a Valid Audio Input Device.\r\n"));
  87                                         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
  88                                         USB_HostState = HOST_STATE_WaitForDeviceRemoval;
  89                                         break;
  90                                 }
  91
  92                                 if (USB_Host_SetDeviceConfiguration(1) != HOST_SENDCONTROL_Successful)
  93                                 {
  94                                         puts_P(PSTR("Error Setting Device Configuration.\r\n"));
  95                                         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
  96                                         USB_HostState = HOST_STATE_WaitForDeviceRemoval;
  97                                         break;
  98                                 }
  99
 100                                 if (Audio_Host_StartStopStreaming(&Microphone_Audio_Interface, true) != HOST_SENDCONTROL_Successful)
 101                                 {
 102                                         puts_P(PSTR("Error Enabling Audio Stream.\r\n"));
 103                                         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 104                                         USB_HostState = HOST_STATE_WaitForDeviceRemoval;
 105                                         break;
 106                                 }
 107
 108                                 USB_Audio_SampleFreq_t SampleRate = AUDIO_SAMPLE_FREQ(48000);
 109                                 if (Audio_GetSetEndpointProperty(&Microphone_Audio_Interface, Microphone_Audio_Interface.Config.DataINPipeNumber,
 110                                                                  AUDIO_REQ_SetCurrent, AUDIO_EPCONTROL_SamplingFreq,
 111                                                                  sizeof(SampleRate), &SampleRate) != HOST_SENDCONTROL_Successful)
 112                                 {
 113                                         puts_P(PSTR("Error Setting Audio Sampling Frequency.\r\n"));
 114                                         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 115                                         USB_HostState = HOST_STATE_WaitForDeviceRemoval;
 116                                         break;
 117                                 }
 118
 119                                 /* Sample reload timer initialization */
 120                                 TIMSK0  = (1 << OCIE0A);
 121                                 OCR0A   = ((F_CPU / 8 / 48000) - 1);
 122                                 TCCR0A  = (1 << WGM01);  // CTC mode
 123                                 TCCR0B  = (1 << CS01);   // Fcpu/8 speed
 124
 125                                 /* Set speaker as output */
 126                                 DDRC   |= (1 << 6);
 127
 128                                 /* PWM speaker timer initialization */
 129                                 TCCR3A  = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0)); // Set on match, clear on TOP
 130                                 TCCR3B  = ((1 << WGM32) | (1 << CS30));  // Fast 8-Bit PWM, F_CPU speed
 131
 132                                 puts_P(PSTR("Audio Device Enumerated.\r\n"));
 133                                 LEDs_SetAllLEDs(LEDMASK_USB_READY);
 134                                 USB_HostState = HOST_STATE_Configured;
 135                                 break;
 136                         case HOST_STATE_Configured:
 137                                 /* Do nothing - audio stream is handled by the timer interrupt routine */
 138                                 break;
 139                 }
 140
 141                 Audio_Host_USBTask(&Microphone_Audio_Interface);
 142                 USB_USBTask();
 143         }
 144 }
 145
 146 /** ISR to handle the reloading of the PWM timer with the next sample. */
 147 ISR(TIMER0_COMPA_vect, ISR_BLOCK)
 148 {
 149         uint8_t PrevPipe = Pipe_GetCurrentPipe();
 150
 151         /* Check that the USB bus is ready for the next sample to read */
 152         if (Audio_Host_IsSampleReceived(&Microphone_Audio_Interface))
 153         {
 154                 /* Retrieve the signed 16-bit audio sample, convert to 8-bit */
 155                 int8_t Sample_8Bit = (Audio_Host_ReadSample16(&Microphone_Audio_Interface) >> 8);
 156
 157                 /* Load the sample into the PWM timer channel */
 158                 OCR3A = (Sample_8Bit ^ (1 << 7));
 159
 160                 uint8_t LEDMask = LEDS_NO_LEDS;
 161
 162                 /* Turn on LEDs as the sample amplitude increases */
 163                 if (Sample_8Bit > 16)
 164                   LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3 | LEDS_LED4);
 165                 else if (Sample_8Bit > 8)
 166                   LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3);
 167                 else if (Sample_8Bit > 4)
 168                   LEDMask = (LEDS_LED1 | LEDS_LED2);
 169                 else if (Sample_8Bit > 2)
 170                   LEDMask = (LEDS_LED1);
 171
 172                 LEDs_SetAllLEDs(LEDMask);
 173         }
 174
 175         Pipe_SelectPipe(PrevPipe);
 176 }
 177
 178 /** Configures the board hardware and chip peripherals for the demo's functionality. */
 179 void SetupHardware(void)
 180 {
 181         /* Disable watchdog if enabled by bootloader/fuses */
 182         MCUSR &= ~(1 << WDRF);
 183         wdt_disable();
 184
 185         /* Disable clock division */
 186         clock_prescale_set(clock_div_1);
 187
 188         /* Hardware Initialization */
 189         Serial_Init(9600, false);
 190         LEDs_Init();
 191         USB_Init();
 192
 193         /* Create a stdio stream for the serial port for stdin and stdout */
 194         Serial_CreateStream(NULL);
 195 }
 196
 197 /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
 198  *  starts the library USB task to begin the enumeration and USB management process.
 199  */
 200 void EVENT_USB_Host_DeviceAttached(void)
 201 {
 202         puts_P(PSTR("Device Attached.\r\n"));
 203         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 204 }
 205
 206 /** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
 207  *  stops the library USB task management process.
 208  */
 209 void EVENT_USB_Host_DeviceUnattached(void)
 210 {
 211         puts_P(PSTR("\r\nDevice Unattached.\r\n"));
 212         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 213 }
 214
 215 /** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
 216  *  enumerated by the host and is now ready to be used by the application.
 217  */
 218 void EVENT_USB_Host_DeviceEnumerationComplete(void)
 219 {
 220         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 221 }
 222
 223 /** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
 224 void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
 225 {
 226         USB_Disable();
 227
 228         printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
 229                                  " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
 230
 231         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 232         for(;;);
 233 }
 234
 235 /** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 236  *  enumerating an attached USB device.
 237  */
 238 void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
 239                                             const uint8_t SubErrorCode)
 240 {
 241         printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
 242                                  " -- Error Code %d\r\n"
 243                                  " -- Sub Error Code %d\r\n"
 244                                  " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
 245
 246         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 247 }
 248