Demos/Host/LowLevel/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 /** 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 Input 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         LEDs_Init();
  70         USB_Init();
  71
  72         /* Create a stdio stream for the serial port for stdin and stdout */
  73         Serial_CreateStream(NULL);
  74 }
  75
  76 /** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
  77  *  starts the library USB task to begin the enumeration and USB management process.
  78  */
  79 void EVENT_USB_Host_DeviceAttached(void)
  80 {
  81         puts_P(PSTR(ESC_FG_GREEN "Device Attached.\r\n" ESC_FG_WHITE));
  82         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  83 }
  84
  85 /** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
  86  *  stops the library USB task management process.
  87  */
  88 void EVENT_USB_Host_DeviceUnattached(void)
  89 {
  90         puts_P(PSTR(ESC_FG_GREEN "Device Unattached.\r\n" ESC_FG_WHITE));
  91         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  92 }
  93
  94 /** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
  95  *  enumerated by the host and is now ready to be used by the application.
  96  */
  97 void EVENT_USB_Host_DeviceEnumerationComplete(void)
  98 {
  99         puts_P(PSTR("Getting Config Data.\r\n"));
 100
 101         uint8_t ErrorCode;
 102
 103         /* Get and process the configuration descriptor data */
 104         if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
 105         {
 106                 if (ErrorCode == ControlError)
 107                   puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
 108                 else
 109                   puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
 110
 111                 printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 112
 113                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 114                 return;
 115         }
 116
 117         /* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
 118         if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
 119         {
 120                 printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
 121                                          " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 122
 123                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 124                 return;
 125         }
 126
 127         if ((ErrorCode = USB_Host_SetInterfaceAltSetting(StreamingInterfaceIndex,
 128                                                          StreamingInterfaceAltSetting)) != HOST_SENDCONTROL_Successful)
 129         {
 130                 printf_P(PSTR(ESC_FG_RED "Could not set alternative streaming interface setting.\r\n"
 131                                          " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
 132
 133                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 134                 USB_Host_SetDeviceConfiguration(0);
 135                 return;
 136         }
 137
 138         USB_ControlRequest = (USB_Request_Header_t)
 139                 {
 140                         .bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_ENDPOINT),
 141                         .bRequest      = AUDIO_REQ_SetCurrent,
 142                         .wValue        = (AUDIO_EPCONTROL_SamplingFreq << 8),
 143                         .wIndex        = StreamingEndpointAddress,
 144                         .wLength       = sizeof(USB_Audio_SampleFreq_t),
 145                 };
 146
 147         USB_Audio_SampleFreq_t SampleRate = AUDIO_SAMPLE_FREQ(48000);
 148
 149         /* Select the control pipe for the request transfer */
 150         Pipe_SelectPipe(PIPE_CONTROLPIPE);
 151
 152         /* Set the sample rate on the streaming interface endpoint */
 153         if ((ErrorCode = USB_Host_SendControlRequest(&SampleRate)) != HOST_SENDCONTROL_Successful)
 154         {
 155                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 156                 USB_Host_SetDeviceConfiguration(0);
 157                 return;
 158         }
 159
 160         /* Sample reload timer initialization */
 161         TIMSK0  = (1 << OCIE0A);
 162         OCR0A   = ((F_CPU / 8 / 48000) - 1);
 163         TCCR0A  = (1 << WGM01);  // CTC mode
 164         TCCR0B  = (1 << CS01);   // Fcpu/8 speed
 165
 166         /* Set speaker as output */
 167         DDRC   |= (1 << 6);
 168
 169         /* PWM speaker timer initialization */
 170         TCCR3A  = ((1 << WGM30) | (1 << COM3A1) | (1 << COM3A0)); // Set on match, clear on TOP
 171         TCCR3B  = ((1 << WGM32) | (1 << CS30));  // Fast 8-Bit PWM, F_CPU speed
 172
 173         puts_P(PSTR("Microphone Enumerated.\r\n"));
 174         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 175 }
 176
 177 /** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
 178 void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
 179 {
 180         USB_Disable();
 181
 182         printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
 183                                  " -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
 184
 185         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 186         for(;;);
 187 }
 188
 189 /** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 190  *  enumerating an attached USB device.
 191  */
 192 void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
 193                                             const uint8_t SubErrorCode)
 194 {
 195         printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
 196                                  " -- Error Code %d\r\n"
 197                                  " -- Sub Error Code %d\r\n"
 198                                  " -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
 199
 200         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 201 }
 202
 203 /** ISR to handle the reloading of the PWM timer with the next sample. */
 204 ISR(TIMER0_COMPA_vect, ISR_BLOCK)
 205 {
 206         uint8_t PrevPipe = Pipe_GetCurrentPipe();
 207
 208         Pipe_SelectPipe(AUDIO_DATA_IN_PIPE);
 209         Pipe_Unfreeze();
 210
 211         /* Check if the current pipe can be read from (contains a packet) and the device is sending data */
 212         if (Pipe_IsINReceived())
 213         {
 214                 /* Retrieve the signed 16-bit audio sample, convert to 8-bit */
 215                 int8_t Sample_8Bit = (Pipe_Read_16_LE() >> 8);
 216
 217                 /* Check to see if the bank is now empty */
 218                 if (!(Pipe_IsReadWriteAllowed()))
 219                 {
 220                         /* Acknowledge the packet, clear the bank ready for the next packet */
 221                         Pipe_ClearIN();
 222                 }
 223
 224                 /* Load the sample into the PWM timer channel */
 225                 OCR3A = (Sample_8Bit ^ (1 << 7));
 226
 227                 uint8_t LEDMask = LEDS_NO_LEDS;
 228
 229                 /* Turn on LEDs as the sample amplitude increases */
 230                 if (Sample_8Bit > 16)
 231                   LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3 | LEDS_LED4);
 232                 else if (Sample_8Bit > 8)
 233                   LEDMask = (LEDS_LED1 | LEDS_LED2 | LEDS_LED3);
 234                 else if (Sample_8Bit > 4)
 235                   LEDMask = (LEDS_LED1 | LEDS_LED2);
 236                 else if (Sample_8Bit > 2)
 237                   LEDMask = (LEDS_LED1);
 238
 239                 LEDs_SetAllLEDs(LEDMask);
 240         }
 241
 242         Pipe_Freeze();
 243         Pipe_SelectPipe(PrevPipe);
 244 }
 245