From 33a018474913701fa9ef8e962acf58accd1184d2 Mon Sep 17 00:00:00 2001
From: Dean Camera <dean@fourwalledcubicle.com>
Date: Sun, 7 Jun 2009 07:20:33 +0000
Subject: Converted device mode low-level demos to schedulerless.

---
 Demos/Device/LowLevel/AudioOutput/AudioOutput.c | 98 ++++++++-----------------
 1 file changed, 30 insertions(+), 68 deletions(-)

(limited to 'Demos/Device/LowLevel/AudioOutput/AudioOutput.c')

diff --git a/Demos/Device/LowLevel/AudioOutput/AudioOutput.c b/Demos/Device/LowLevel/AudioOutput/AudioOutput.c
index 40e376b52..7a9c6eca0 100644
--- a/Demos/Device/LowLevel/AudioOutput/AudioOutput.c
+++ b/Demos/Device/LowLevel/AudioOutput/AudioOutput.c
@@ -36,18 +36,27 @@
  
 #include "AudioOutput.h"
 
-/* Scheduler Task List */
-TASK_LIST
-{
-	{ .Task = USB_USBTask          , .TaskStatus = TASK_STOP },
-	{ .Task = USB_Audio_Task       , .TaskStatus = TASK_STOP },
-};
-
+/** Flag to indicate if the streaming audio alternative interface has been selected by the host. */
+bool StreamingAudioInterfaceSelected = false;
 
-/** Main program entry point. This routine configures the hardware required by the application, then
- *  starts the scheduler to run the application tasks.
+/** Main program entry point. This routine contains the overall program flow, including initial
+ *  setup of all components and the main program loop.
  */
 int main(void)
+{
+	SetupHardware();
+
+	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+	
+	for (;;)
+	{
+		USB_Audio_Task();
+		USB_USBTask();
+	}
+}
+
+/** Configures the board hardware and chip peripherals for the demo's functionality. */
+void SetupHardware(void)
 {
 	/* Disable watchdog if enabled by bootloader/fuses */
 	MCUSR &= ~(1 << WDRF);
@@ -55,21 +64,10 @@ int main(void)
 
 	/* Disable clock division */
 	clock_prescale_set(clock_div_1);
-
+	
 	/* Hardware Initialization */
 	LEDs_Init();
-	
-	/* 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
@@ -77,11 +75,8 @@ int main(void)
  */
 void EVENT_USB_Connect(void)
 {
-	/* Start USB management task */
-	Scheduler_SetTaskMode(USB_USBTask, TASK_RUN);
-
 	/* Indicate USB enumerating */
-	UpdateStatus(Status_USBEnumerating);
+	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 	
 	/* Sample reload timer initialization */
 	OCR0A   = (F_CPU / AUDIO_SAMPLE_FREQUENCY) - 1;
@@ -129,12 +124,11 @@ void EVENT_USB_Disconnect(void)
 	PORTC  = 0x00;
 #endif
 
-	/* Stop running audio and USB management tasks */
-	Scheduler_SetTaskMode(USB_Audio_Task, TASK_STOP);
-	Scheduler_SetTaskMode(USB_USBTask, TASK_STOP);
+	/* Indicate streaming audio interface not selected */
+	StreamingAudioInterfaceSelected = false;
 
 	/* Indicate USB not ready */
-	UpdateStatus(Status_USBNotReady);
+	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 }
 
 /** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
@@ -148,7 +142,7 @@ void EVENT_USB_ConfigurationChanged(void)
 	                           ENDPOINT_BANK_DOUBLE);
 
 	/* Indicate USB connected and ready */
-	UpdateStatus(Status_USBReady);
+	LEDs_SetAllLEDs(LEDMASK_USB_READY);
 }
 
 /** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
@@ -167,16 +161,7 @@ void EVENT_USB_UnhandledControlPacket(void)
 				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);				
-				}
+				StreamingAudioInterfaceSelected = ((USB_ControlRequest.wValue) != 0);
 				
 				/* Acknowledge status stage */
 				while (!(Endpoint_IsINReady()));
@@ -187,38 +172,15 @@ void EVENT_USB_UnhandledControlPacket(void)
 	}
 }
 
-/** 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 AudioOutput_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 audio samples from the host, and outputting them to the speakers/LEDs as
  *  desired.
  */
-TASK(USB_Audio_Task)
+void USB_Audio_Task(void)
 {
+	/* Check to see if the streaming interface is selected, if not the host is not receiving audio */
+	if (!(StreamingAudioInterfaceSelected))
+	  return;	
+
 	/* Select the audio stream endpoint */
 	Endpoint_SelectEndpoint(AUDIO_STREAM_EPNUM);
 	
-- 
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