Move new Class Driver powered demos to a new ClassDriver subdirectory, re-add old low level demos to a LowLevel subdirectory.

1 files changed, 220 insertions, 0 deletions

diff --git a/Demos/Device/LowLevel/AudioInput/AudioInput.c b/Demos/Device/LowLevel/AudioInput/AudioInput.c
new file mode 100644
index 000000000..ecd8cdda8
--- /dev/null
+++ b/Demos/Device/LowLevel/AudioInput/AudioInput.c
@@ -0,0 +1,220 @@
+/*

+             LUFA Library

+     Copyright (C) Dean Camera, 2009.

+              

+  dean [at] fourwalledcubicle [dot] com

+      www.fourwalledcubicle.com

+*/

+

+/*

+  Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)

+

+  Permission to use, copy, modify, and distribute this software

+  and its documentation for any purpose and without fee is hereby

+  granted, provided that the above copyright notice appear in all

+  copies and that both that the copyright notice and this

+  permission notice and warranty disclaimer appear in supporting

+  documentation, and that the name of the author not be used in

+  advertising or publicity pertaining to distribution of the

+  software without specific, written prior permission.

+

+  The author disclaim all warranties with regard to this

+  software, including all implied warranties of merchantability

+  and fitness.  In no event shall the author be liable for any

+  special, indirect or consequential damages or any damages

+  whatsoever resulting from loss of use, data or profits, whether

+  in an action of contract, negligence or other tortious action,

+  arising out of or in connection with the use or performance of

+  this software.

+*/

+

+/** \file

+ *

+ *  Main source file for the Audio Input demo. This file contains the main tasks of the demo and

+ *  is responsible for the initial application hardware configuration.

+ */

+

+#include "AudioInput.h"

+

+/* Scheduler Task List */

+TASK_LIST

+{

+	{ .Task = USB_USBTask          , .TaskStatus = TASK_STOP },

+	{ .Task = USB_Audio_Task       , .TaskStatus = TASK_STOP },

+};

+

+

+/** Main program entry point. This routine configures the hardware required by the application, then

+ *  starts the scheduler to run the application tasks.

+ */

+int main(void)

+{

+	/* Disable watchdog if enabled by bootloader/fuses */

+	MCUSR &= ~(1 << WDRF);

+	wdt_disable();

+

+	/* Disable clock division */

+	clock_prescale_set(clock_div_1);

+	

+	/* Hardware Initialization */

+	LEDs_Init();

+	ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);

+	ADC_SetupChannel(MIC_IN_ADC_CHANNEL);

+	

+	/* Start the ADC conversion in free running mode */

+	ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | MIC_IN_ADC_CHANNEL);

+	

+	/* Indicate USB not ready */

+	UpdateStatus(Status_USBNotReady);

+	

+	/* Initialize Scheduler so that it can be used */

+	Scheduler_Init();

+

+	/* Initialize USB Subsystem */

+	USB_Init();

+

+	/* Scheduling - routine never returns, so put this last in the main function */

+	Scheduler_Start();

+}

+

+/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs, and

+ *  configures the sample update and PWM timers.

+ */

+void EVENT_USB_Connect(void)

+{

+	/* Start USB management task */

+	Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);

+

+	/* Indicate USB enumerating */

+	UpdateStatus(Status_USBEnumerating);

+

+	/* Sample reload timer initialization */

+	OCR0A   = (F_CPU / AUDIO_SAMPLE_FREQUENCY) - 1;

+	TCCR0A  = (1 << WGM01);  // CTC mode

+	TCCR0B  = (1 << CS00);   // Fcpu speed

+}

+

+/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via

+ *  the status LEDs, disables the sample update and PWM output timers and stops the USB and Audio management tasks.

+ */

+void EVENT_USB_Disconnect(void)

+{

+	/* Stop the sample reload timer */

+	TCCR0B = 0;

+

+	/* Stop running audio and USB management tasks */

+	Scheduler_SetTaskMode(USB_Audio_Task, TASK_STOP);

+	Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);

+

+	/* Indicate USB not ready */

+	UpdateStatus(Status_USBNotReady);

+}

+

+/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration

+ *  of the USB device after enumeration - the device endpoints are configured.

+ */

+void EVENT_USB_ConfigurationChanged(void)

+{

+	/* Setup audio stream endpoint */

+	Endpoint_ConfigureEndpoint(AUDIO_STREAM_EPNUM, EP_TYPE_ISOCHRONOUS,

+		                       ENDPOINT_DIR_IN, AUDIO_STREAM_EPSIZE,

+	                           ENDPOINT_BANK_DOUBLE);

+

+	/* Indicate USB connected and ready */

+	UpdateStatus(Status_USBReady);

+}

+

+/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific

+ *  control requests that are not handled internally by the USB library (including the Audio class-specific

+ *  requests) so that they can be handled appropriately for the application.

+ */

+void EVENT_USB_UnhandledControlPacket(void)

+{

+	/* Process General and Audio specific control requests */

+	switch (USB_ControlRequest.bRequest)

+	{

+		case REQ_SetInterface:

+			/* Set Interface is not handled by the library, as its function is application-specific */

+			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE))

+			{

+				Endpoint_ClearSETUP();

+				

+				/* Check if the host is enabling the audio interface (setting AlternateSetting to 1) */

+				if (USB_ControlRequest.wValue)

+				{

+					/* Start audio task */

+					Scheduler_SetTaskMode(USB_Audio_Task, TASK_RUN);

+				}

+				else

+				{

+					/* Stop audio task */

+					Scheduler_SetTaskMode(USB_Audio_Task, TASK_STOP);				

+				}

+				

+				/* Acknowledge status stage */

+				while (!(Endpoint_IsINReady()));

+				Endpoint_ClearIN();

+			}

+

+			break;

+	}

+}

+

+/** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to

+ *  log to a serial port, or anything else that is suitable for status updates.

+ *

+ *  \param CurrentStatus  Current status of the system, from the AudioInput_StatusCodes_t enum

+ */

+void UpdateStatus(uint8_t CurrentStatus)

+{

+	uint8_t LEDMask = LEDS_NO_LEDS;

+	

+	/* Set the LED mask to the appropriate LED mask based on the given status code */

+	switch (CurrentStatus)

+	{

+		case Status_USBNotReady:

+			LEDMask = (LEDS_LED1);

+			break;

+		case Status_USBEnumerating:

+			LEDMask = (LEDS_LED1 | LEDS_LED2);

+			break;

+		case Status_USBReady:

+			LEDMask = (LEDS_LED2 | LEDS_LED4);

+			break;

+	}

+	

+	/* Set the board LEDs to the new LED mask */

+	LEDs_SetAllLEDs(LEDMask);

+}

+

+/** Task to manage the Audio interface, reading in ADC samples from the microphone, and them to the host. */

+TASK(USB_Audio_Task)

+{

+	/* Select the audio stream endpoint */

+	Endpoint_SelectEndpoint(AUDIO_STREAM_EPNUM);

+	

+	/* Check if the current endpoint can be written to and that the next sample should be stored */

+	if (Endpoint_IsINReady() && (TIFR0 & (1 << OCF0A)))

+	{

+		/* Clear the sample reload timer */

+		TIFR0 |= (1 << OCF0A);

+

+		/* Audio sample is ADC value scaled to fit the entire range */

+		int16_t AudioSample = ((SAMPLE_MAX_RANGE / ADC_MAX_RANGE) * ADC_GetResult());

+		

+#if defined(MICROPHONE_BIASED_TO_HALF_RAIL)

+		/* Microphone is biased to half rail voltage, subtract the bias from the sample value */

+		AudioSample -= (SAMPLE_MAX_RANGE / 2));

+#endif

+

+		/* Write the sample to the buffer */

+		Endpoint_Write_Word_LE(AudioSample);

+

+		/* Check to see if the bank is now full */

+		if (!(Endpoint_IsReadWriteAllowed()))

+		{

+			/* Send the full packet to the host */

+			Endpoint_ClearIN();

+		}

+	}

+}