Add extra LUFA TAR archive export exclusions.

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

diff --git a/Demos/Device/LowLevel/AudioInput/AudioInput.c b/Demos/Device/LowLevel/AudioInput/AudioInput.c
index 7a5a0a6..60eeaf6 100644 (file)
--- a/Demos/Device/LowLevel/AudioInput/AudioInput.c
+++ b/Demos/Device/LowLevel/AudioInput/AudioInput.c
@@ -1,13 +1,13 @@
 /*
              LUFA Library
-     Copyright (C) Dean Camera, 2011.
+     Copyright (C) Dean Camera, 2012.
 
   dean [at] fourwalledcubicle [dot] com
            www.lufa-lib.org
 */
 
 /*
-  Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+  Copyright 2012  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
@@ -39,6 +39,9 @@
 /** Flag to indicate if the streaming audio alternative interface has been selected by the host. */
 static bool StreamingAudioInterfaceSelected = false;
 
+/** Current audio sampling frequency of the streaming audio endpoint. */
+static uint32_t CurrentAudioSampleFrequency = 48000;
+
 
 /** Main program entry point. This routine contains the overall program flow, including initial
  *  setup of all components and the main program loop.
@@ -87,7 +90,7 @@ void EVENT_USB_Device_Connect(void)
 
        /* Sample reload timer initialization */
        TIMSK0  = (1 << OCIE0A);
-       OCR0A   = ((F_CPU / 8 / AUDIO_SAMPLE_FREQUENCY) - 1);
+       OCR0A   = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1);
        TCCR0A  = (1 << WGM01);  // CTC mode
        TCCR0B  = (1 << CS01);   // Fcpu/8 speed
 }
@@ -143,6 +146,66 @@ void EVENT_USB_Device_ControlRequest(void)
                        }
 
                        break;
+               case AUDIO_REQ_GetStatus:
+                       /* Get Status request can be directed at either the interface or endpoint, neither is currently used
+                        * according to the latest USB Audio 1.0 standard, but must be ACKed with no data when requested */
+                       if ((USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE)) ||
+                           (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_ENDPOINT)))
+                       {
+                               Endpoint_ClearSETUP();
+                               Endpoint_ClearStatusStage();
+                       }
+
+                       break;
+               case AUDIO_REQ_SetCurrent:
+                       if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_ENDPOINT))
+                       {
+                               /* Extract out the relevant request information to get the target Endpoint address and control being set */
+                               uint8_t EndpointAddress = (uint8_t)USB_ControlRequest.wIndex;
+                               uint8_t EndpointControl = (USB_ControlRequest.wValue >> 8);
+
+                               /* Only handle SET CURRENT requests to the audio endpoint's sample frequency property */
+                               if ((EndpointAddress == (ENDPOINT_DIR_IN | AUDIO_STREAM_EPNUM)) && (EndpointControl == AUDIO_EPCONTROL_SamplingFreq))
+                               {
+                                       uint8_t SampleRate[3];
+
+                                       Endpoint_ClearSETUP();
+                                       Endpoint_Read_Control_Stream_LE(SampleRate, sizeof(SampleRate));
+                                       Endpoint_ClearIN();
+
+                                       /* Set the new sampling frequency to the value given by the host */
+                                       CurrentAudioSampleFrequency = (((uint32_t)SampleRate[2] << 16) | ((uint32_t)SampleRate[1] << 8) | (uint32_t)SampleRate[0]);
+
+                                       /* Adjust sample reload timer to the new frequency */
+                                       OCR0A = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1);
+                               }
+                       }
+
+                       break;
+               case AUDIO_REQ_GetCurrent:
+                       if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_ENDPOINT))
+                       {
+                               /* Extract out the relevant request information to get the target Endpoint address and control being retrieved */
+                               uint8_t EndpointAddress = (uint8_t)USB_ControlRequest.wIndex;
+                               uint8_t EndpointControl = (USB_ControlRequest.wValue >> 8);
+
+                               /* Only handle GET CURRENT requests to the audio endpoint's sample frequency property */
+                               if ((EndpointAddress == (ENDPOINT_DIR_IN | AUDIO_STREAM_EPNUM)) && (EndpointControl == AUDIO_EPCONTROL_SamplingFreq))
+                               {
+                                       uint8_t SampleRate[3];
+
+                                       /* Convert the sampling rate value into the 24-bit format the host expects for the property */
+                                       SampleRate[2] = (CurrentAudioSampleFrequency >> 16);
+                                       SampleRate[1] = (CurrentAudioSampleFrequency >> 8);
+                                       SampleRate[0] = (CurrentAudioSampleFrequency &  0xFF);
+
+                                       Endpoint_ClearSETUP();
+                                       Endpoint_Write_Control_Stream_LE(SampleRate, sizeof(SampleRate));
+                                       Endpoint_ClearOUT();
+                               }
+                       }
+
+                       break;
        }
 }
 
@@ -162,11 +225,11 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK)
                #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
@@ -176,7 +239,7 @@ ISR(TIMER0_COMPA_vect, ISR_BLOCK)
                        #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
 
                /* Write the sample to the buffer */