250 lines
8 KiB
C
250 lines
8 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2017.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2017 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Main source file for the AudioOutputHost demo. This file contains the main tasks of
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* the demo and is responsible for the initial application hardware configuration.
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*/
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#include "AudioOutputHost.h"
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/** Main program entry point. This routine configures the hardware required by the application, then
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* enters a loop to run the application tasks in sequence.
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*/
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int main(void)
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{
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SetupHardware();
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puts_P(PSTR(ESC_FG_CYAN "Audio Output Host Demo running.\r\n" ESC_FG_WHITE));
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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GlobalInterruptEnable();
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for (;;)
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{
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USB_USBTask();
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}
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}
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/** Configures the board hardware and chip peripherals for the demo's functionality. */
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void SetupHardware(void)
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{
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#if (ARCH == ARCH_AVR8)
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/* Disable watchdog if enabled by bootloader/fuses */
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MCUSR &= ~(1 << WDRF);
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wdt_disable();
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/* Disable clock division */
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clock_prescale_set(clock_div_1);
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#endif
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/* Hardware Initialization */
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Serial_Init(9600, false);
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Buttons_Init();
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ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
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ADC_SetupChannel(MIC_IN_ADC_CHANNEL);
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LEDs_Init();
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USB_Init();
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/* Create a stdio stream for the serial port for stdin and stdout */
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Serial_CreateStream(NULL);
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/* Start the ADC conversion in free running mode */
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ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | ADC_GET_CHANNEL_MASK(MIC_IN_ADC_CHANNEL));
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}
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/** Event handler for the USB_DeviceAttached event. This indicates that a device has been attached to the host, and
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* starts the library USB task to begin the enumeration and USB management process.
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*/
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void EVENT_USB_Host_DeviceAttached(void)
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{
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puts_P(PSTR(ESC_FG_GREEN "Device Attached.\r\n" ESC_FG_WHITE));
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LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
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}
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/** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
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* stops the library USB task management process.
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*/
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void EVENT_USB_Host_DeviceUnattached(void)
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{
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puts_P(PSTR(ESC_FG_GREEN "Device Unattached.\r\n" ESC_FG_WHITE));
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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}
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/** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
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* enumerated by the host and is now ready to be used by the application.
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*/
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void EVENT_USB_Host_DeviceEnumerationComplete(void)
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{
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puts_P(PSTR("Getting Config Data.\r\n"));
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uint8_t ErrorCode;
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/* Get and process the configuration descriptor data */
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if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
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{
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if (ErrorCode == ControlError)
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puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
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else
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puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));
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printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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return;
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}
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/* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
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if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
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{
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printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
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" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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return;
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}
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if ((ErrorCode = USB_Host_SetInterfaceAltSetting(StreamingInterfaceIndex,
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StreamingInterfaceAltSetting)) != HOST_SENDCONTROL_Successful)
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{
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printf_P(PSTR(ESC_FG_RED "Could not set alternative streaming interface setting.\r\n"
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" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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USB_Host_SetDeviceConfiguration(0);
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return;
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}
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USB_ControlRequest = (USB_Request_Header_t)
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{
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.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_ENDPOINT),
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.bRequest = AUDIO_REQ_SetCurrent,
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.wValue = (AUDIO_EPCONTROL_SamplingFreq << 8),
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.wIndex = StreamingEndpointAddress,
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.wLength = sizeof(USB_Audio_SampleFreq_t),
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};
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USB_Audio_SampleFreq_t SampleRate = AUDIO_SAMPLE_FREQ(48000);
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/* Select the control pipe for the request transfer */
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Pipe_SelectPipe(PIPE_CONTROLPIPE);
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/* Set the sample rate on the streaming interface endpoint */
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if ((ErrorCode = USB_Host_SendControlRequest(&SampleRate)) != HOST_SENDCONTROL_Successful)
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{
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printf_P(PSTR(ESC_FG_RED "Could not set requested Audio sample rate.\r\n"
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" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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USB_Host_SetDeviceConfiguration(0);
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return;
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}
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/* Sample reload timer initialization */
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TIMSK0 = (1 << OCIE0A);
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OCR0A = ((F_CPU / 8 / 48000) - 1);
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TCCR0A = (1 << WGM01); // CTC mode
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TCCR0B = (1 << CS01); // Fcpu/8 speed
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puts_P(PSTR("Speaker Enumerated.\r\n"));
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LEDs_SetAllLEDs(LEDMASK_USB_READY);
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}
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/** Event handler for the USB_HostError event. This indicates that a hardware error occurred while in host mode. */
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void EVENT_USB_Host_HostError(const uint8_t ErrorCode)
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{
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USB_Disable();
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printf_P(PSTR(ESC_FG_RED "Host Mode Error\r\n"
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" -- Error Code %d\r\n" ESC_FG_WHITE), ErrorCode);
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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for(;;);
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}
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/** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
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* enumerating an attached USB device.
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*/
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void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
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const uint8_t SubErrorCode)
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{
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printf_P(PSTR(ESC_FG_RED "Dev Enum Error\r\n"
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" -- Error Code %d\r\n"
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" -- Sub Error Code %d\r\n"
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" -- In State %d\r\n" ESC_FG_WHITE), ErrorCode, SubErrorCode, USB_HostState);
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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/** ISR to handle the reloading of the endpoint with the next sample. */
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ISR(TIMER0_COMPA_vect, ISR_BLOCK)
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{
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uint8_t PrevPipe = Pipe_GetCurrentPipe();
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Pipe_SelectPipe(AUDIO_DATA_OUT_PIPE);
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Pipe_Unfreeze();
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/* Check if the current pipe can be written to (device ready for more data) */
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if (Pipe_IsOUTReady())
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{
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int16_t AudioSample;
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#if defined(USE_TEST_TONE)
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static uint8_t SquareWaveSampleCount;
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static int16_t CurrentWaveValue;
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/* In test tone mode, generate a square wave at 1/256 of the sample rate */
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if (SquareWaveSampleCount++ == 0xFF)
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CurrentWaveValue ^= 0x8000;
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/* Only generate audio if the board button is being pressed */
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AudioSample = (Buttons_GetStatus() & BUTTONS_BUTTON1) ? CurrentWaveValue : 0;
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#else
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/* Audio sample is ADC value scaled to fit the entire range */
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AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult());
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#if defined(MICROPHONE_BIASED_TO_HALF_RAIL)
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/* Microphone is biased to half rail voltage, subtract the bias from the sample value */
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AudioSample -= (SAMPLE_MAX_RANGE / 2);
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#endif
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#endif
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Pipe_Write_16_LE(AudioSample);
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Pipe_Write_16_LE(AudioSample);
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if (!(Pipe_IsReadWriteAllowed()))
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Pipe_ClearOUT();
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}
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Pipe_Freeze();
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Pipe_SelectPipe(PrevPipe);
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}
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