X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/bd337aced3b1888373030878bf1a49367bc37ab5..6e7fc21a94f29e09b4bdce7c17cade5b1322bc7d:/Demos/Device/LowLevel/AudioInput/AudioInput.c?ds=sidebyside

diff --git a/Demos/Device/LowLevel/AudioInput/AudioInput.c b/Demos/Device/LowLevel/AudioInput/AudioInput.c
index e681f3bd1..7a5a0a6ea 100644
--- a/Demos/Device/LowLevel/AudioInput/AudioInput.c
+++ b/Demos/Device/LowLevel/AudioInput/AudioInput.c
@@ -1,13 +1,13 @@
 /*
              LUFA Library
-     Copyright (C) Dean Camera, 2010.
+     Copyright (C) Dean Camera, 2011.
 
   dean [at] fourwalledcubicle [dot] com
-      www.fourwalledcubicle.com
+           www.lufa-lib.org
 */
 
 /*
-  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+  Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)
 
   Permission to use, copy, modify, distribute, and sell this
   software and its documentation for any purpose is hereby granted
@@ -37,7 +37,8 @@
 #include "AudioInput.h"
 
 /** Flag to indicate if the streaming audio alternative interface has been selected by the host. */
-bool StreamingAudioInterfaceSelected = false;
+static bool StreamingAudioInterfaceSelected = false;
+
 
 /** Main program entry point. This routine contains the overall program flow, including initial
  *  setup of all components and the main program loop.
@@ -51,7 +52,6 @@ int main(void)
 
 	for (;;)
 	{
-		USB_Audio_Task();
 		USB_USBTask();
 	}
 }
@@ -86,7 +86,8 @@ void EVENT_USB_Device_Connect(void)
 	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 
 	/* Sample reload timer initialization */
-	OCR0A   = (F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1;
+	TIMSK0  = (1 << OCIE0A);
+	OCR0A   = ((F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1);
 	TCCR0A  = (1 << WGM01);  // CTC mode
 	TCCR0B  = (1 << CS01);   // Fcpu/8 speed
 }
@@ -121,11 +122,11 @@ void EVENT_USB_Device_ConfigurationChanged(void)
 	LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
 }
 
-/** Event handler for the USB_UnhandledControlRequest 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.
+/** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
+ *  the device from the USB host before passing along unhandled control requests to the library for processing
+ *  internally.
  */
-void EVENT_USB_Device_UnhandledControlRequest(void)
+void EVENT_USB_Device_ControlRequest(void)
 {
 	/* Process General and Audio specific control requests */
 	switch (USB_ControlRequest.bRequest)
@@ -145,26 +146,17 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 	}
 }
 
-/** Task to manage the Audio interface, reading in ADC samples from the microphone, and them to the host. */
-void USB_Audio_Task(void)
+/** ISR to handle the reloading of the data endpoint with the next sample. */
+ISR(TIMER0_COMPA_vect, ISR_BLOCK)
 {
-	/* Device must be connected and configured for the task to run */
-	if (USB_DeviceState != DEVICE_STATE_Configured)
-	  return;
-
-	/* Check to see if the streaming interface is selected, if not the host is not receiving audio */
-	if (!(StreamingAudioInterfaceSelected))
-	  return;
+	uint8_t PrevEndpoint = Endpoint_GetCurrentEndpoint();
 
 	/* 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)))
+	/* Check if the current endpoint can be written to and that the audio interface is enabled */
+	if (Endpoint_IsINReady() && StreamingAudioInterfaceSelected)
 	{
-		/* Clear the sample reload timer */
-		TIFR0 |= (1 << OCF0A);
-
 		int16_t AudioSample;
 
 		#if defined(USE_TEST_TONE)
@@ -185,10 +177,10 @@ void USB_Audio_Task(void)
 			/* Microphone is biased to half rail voltage, subtract the bias from the sample value */
 			AudioSample -= (SAMPLE_MAX_RANGE / 2);
 			#endif		
-		#end if
+		#endif
 
 		/* Write the sample to the buffer */
-		Endpoint_Write_Word_LE(AudioSample);
+		Endpoint_Write_16_LE(AudioSample);
 
 		/* Check to see if the bank is now full */
 		if (!(Endpoint_IsReadWriteAllowed()))
@@ -197,5 +189,7 @@ void USB_Audio_Task(void)
 			Endpoint_ClearIN();
 		}
 	}
+
+	Endpoint_SelectEndpoint(PrevEndpoint);
 }