More UC3B architecture port updates.

[pub/USBasp.git] / Demos / Device / ClassDriver / AudioInput / AudioInput.c

diff --git a/Demos/Device/ClassDriver/AudioInput/AudioInput.c b/Demos/Device/ClassDriver/AudioInput/AudioInput.c
index dc7a076..b197588 100644 (file)
--- a/Demos/Device/ClassDriver/AudioInput/AudioInput.c
+++ b/Demos/Device/ClassDriver/AudioInput/AudioInput.c
@@ -1,13 +1,13 @@
 /*
              LUFA Library
 /*
              LUFA Library

-     Copyright (C) Dean Camera, 2010.
+     Copyright (C) Dean Camera, 2011.

 
   dean [at] fourwalledcubicle [dot] com
 
   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
 
   Permission to use, copy, modify, distribute, and sell this
   software and its documentation for any purpose is hereby granted


@@ -51,6 +51,7 @@ USB_ClassInfo_Audio_Device_t Microphone_Audio_Interface =
                        },
        };
 
                        },
        };
 

+

 /** Main program entry point. This routine contains the overall program flow, including initial
  *  setup of all components and the main program loop.
  */
 /** Main program entry point. This routine contains the overall program flow, including initial
  *  setup of all components and the main program loop.
  */


@@ -63,8 +64,6 @@ int main(void)
 
        for (;;)
        {
 
        for (;;)
        {

-               ProcessNextSample();
-

                Audio_Device_USBTask(&Microphone_Audio_Interface);
                USB_USBTask();
        }
                Audio_Device_USBTask(&Microphone_Audio_Interface);
                USB_USBTask();
        }


@@ -82,35 +81,49 @@ void SetupHardware(void)
 
        /* Hardware Initialization */
        LEDs_Init();
 
        /* Hardware Initialization */
        LEDs_Init();

-       USB_Init();
+       Buttons_Init();

        ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
        ADC_SetupChannel(MIC_IN_ADC_CHANNEL);
        ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
        ADC_SetupChannel(MIC_IN_ADC_CHANNEL);

+       USB_Init();

 
        /* Start the ADC conversion in free running mode */
        ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | MIC_IN_ADC_MUX_MASK);
 }
 
 
        /* Start the ADC conversion in free running mode */
        ADC_StartReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | MIC_IN_ADC_MUX_MASK);
 }
 

-/** Processes the next audio sample by reading the last ADC conversion and writing it to the audio
- *  interface, each time the sample reload timer period elapses to give a constant sample rate.
- */
-void ProcessNextSample(void)
+/** ISR to handle the reloading of the data endpoint with the next sample. */
+ISR(TIMER0_COMPA_vect, ISR_BLOCK)

 {
 {

+       uint8_t PrevEndpoint = Endpoint_GetCurrentEndpoint();
+

        /* Check if the sample reload timer period has elapsed, and that the USB bus is ready for a new sample */
        /* Check if the sample reload timer period has elapsed, and that the USB bus is ready for a new sample */

-       if ((TIFR0 & (1 << OCF0A)) && Audio_Device_IsReadyForNextSample(&Microphone_Audio_Interface))
+       if (Audio_Device_IsReadyForNextSample(&Microphone_Audio_Interface))

        {
        {

-               /* Clear the sample reload timer compare flag, ready for the next interval */
-               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);
+               int16_t AudioSample;
+
+               #if defined(USE_TEST_TONE)
+                       static uint8_t SquareWaveSampleCount;
+                       static int16_t CurrentWaveValue;
+                       
+                       /* In test tone mode, generate a square wave at 1/256 of the sample rate */
+                       if (SquareWaveSampleCount++ == 0xFF)
+                         CurrentWaveValue ^= 0x8000;
+                       
+                       /* Only generate audio if the board button is being pressed */
+                       AudioSample = (Buttons_GetStatus() & BUTTONS_BUTTON1) ? CurrentWaveValue : 0;
+               #else
+                       /* Audio sample is ADC value scaled to fit the entire range */
+                       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

                #endif
                #endif

-
+               

                Audio_Device_WriteSample16(&Microphone_Audio_Interface, AudioSample);
        }
                Audio_Device_WriteSample16(&Microphone_Audio_Interface, AudioSample);
        }

+
+       Endpoint_SelectEndpoint(PrevEndpoint);

 }
 
 /** Event handler for the library USB Connection event. */
 }
 
 /** Event handler for the library USB Connection event. */


@@ -119,7 +132,8 @@ void EVENT_USB_Device_Connect(void)
        LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 
        /* Sample reload timer initialization */
        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
 }
        TCCR0A  = (1 << WGM01);  // CTC mode
        TCCR0B  = (1 << CS01);   // Fcpu/8 speed
 }


@@ -143,8 +157,8 @@ void EVENT_USB_Device_ConfigurationChanged(void)
        LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
 }
 
        LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
 }
 

-/** Event handler for the library USB Unhandled Control Request event. */
-void EVENT_USB_Device_UnhandledControlRequest(void)
+/** Event handler for the library USB Control Request reception event. */
+void EVENT_USB_Device_ControlRequest(void)

 {
        Audio_Device_ProcessControlRequest(&Microphone_Audio_Interface);
 }
 {
        Audio_Device_ProcessControlRequest(&Microphone_Audio_Interface);
 }