/*
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
};
/** Current audio sampling frequency of the streaming audio endpoint. */
-uint32_t CurrentAudioSampleFrequency = 48000;
+static uint32_t CurrentAudioSampleFrequency = 48000;
/** Main program entry point. This routine contains the overall program flow, including initial
{
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 that the USB bus is ready for the next sample to write */
if (Audio_Device_IsReadyForNextSample(&Microphone_Audio_Interface))
{
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
AudioSample -= (SAMPLE_MAX_RANGE / 2);
#endif
#endif
-
+
Audio_Device_WriteSample16(&Microphone_Audio_Interface, AudioSample);
}
*
* \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
* \param[in] EndpointProperty Property of the endpoint to get or set, a value from Audio_ClassRequests_t.
- * \param[in] EndpointIndex Index of the streaming endpoint whose property is being referenced.
+ * \param[in] EndpointAddress Address of the streaming endpoint whose property is being referenced.
* \param[in] EndpointControl Parameter of the endpoint to get or set, a value from Audio_EndpointControls_t.
* \param[in,out] DataLength For SET operations, the length of the parameter data to set. For GET operations, the maximum
* length of the retrieved data. When NULL, the function should return whether the given property
* \param[in,out] Data Pointer to a location where the parameter data is stored for SET operations, or where
* the retrieved data is to be stored for GET operations.
*
- * \return Boolean true if the property get/set was successful, false otherwise
+ * \return Boolean \c true if the property get/set was successful, \c false otherwise
*/
-bool CALLBACK_Audio_GetSetEndpointProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
- const uint8_t EndpointProperty,
- const uint8_t EndpointIndex,
- const uint8_t EndpointControl,
- uint16_t* const DataLength,
- uint8_t* Data)
+bool CALLBACK_Audio_Device_GetSetEndpointProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
+ const uint8_t EndpointProperty,
+ const uint8_t EndpointAddress,
+ const uint8_t EndpointControl,
+ uint16_t* const DataLength,
+ uint8_t* Data)
{
/* Check the requested endpoint to see if a supported endpoint is being manipulated */
- if (EndpointIndex == Microphone_Audio_Interface.Config.DataINEndpointNumber)
+ if (EndpointAddress == (ENDPOINT_DIR_IN | Microphone_Audio_Interface.Config.DataINEndpointNumber))
{
/* Check the requested control to see if a supported control is being manipulated */
if (EndpointControl == AUDIO_EPCONTROL_SamplingFreq)
{
- /* Check the requested property to see if a supported property is being manipulated */
- if (EndpointProperty == AUDIO_REQ_SetCurrent)
+ switch (EndpointProperty)
{
- /* Check if we are just testing for a valid property, or actually adjusting it */
- if (DataLength != NULL)
- {
- /* Set the new sampling frequency to the value given by the host */
- CurrentAudioSampleFrequency = (((uint32_t)Data[2] << 16) | ((uint32_t)Data[1] << 8) | (uint32_t)Data[0]);
-
- /* Adjust sample reload timer to the new frequency */
- OCR0A = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1);
- }
-
- return true;
- }
- else if (EndpointProperty == AUDIO_REQ_GetCurrent)
- {
- /* Check if we are just testing for a valid property, or actually reading it */
- if (DataLength != NULL)
- {
- *DataLength = 3;
-
- Data[2] = (CurrentAudioSampleFrequency >> 16);
- Data[1] = (CurrentAudioSampleFrequency >> 8);
- Data[0] = (CurrentAudioSampleFrequency & 0xFF);
- }
-
- return true;
+ case AUDIO_REQ_SetCurrent:
+ /* Check if we are just testing for a valid property, or actually adjusting it */
+ if (DataLength != NULL)
+ {
+ /* Set the new sampling frequency to the value given by the host */
+ CurrentAudioSampleFrequency = (((uint32_t)Data[2] << 16) | ((uint32_t)Data[1] << 8) | (uint32_t)Data[0]);
+
+ /* Adjust sample reload timer to the new frequency */
+ OCR0A = ((F_CPU / 8 / CurrentAudioSampleFrequency) - 1);
+ }
+
+ return true;
+ case AUDIO_REQ_GetCurrent:
+ /* Check if we are just testing for a valid property, or actually reading it */
+ if (DataLength != NULL)
+ {
+ *DataLength = 3;
+
+ Data[2] = (CurrentAudioSampleFrequency >> 16);
+ Data[1] = (CurrentAudioSampleFrequency >> 8);
+ Data[0] = (CurrentAudioSampleFrequency & 0xFF);
+ }
+
+ return true;
}
}
}
-
+
+ return false;
+}
+
+/** Audio class driver callback for the setting and retrieval of streaming interface properties. This callback must be implemented
+ * in the user application to handle property manipulations on streaming audio interfaces.
+ *
+ * When the DataLength parameter is NULL, this callback should only indicate whether the specified operation is valid for
+ * the given entity and should return as fast as possible. When non-NULL, this value may be altered for GET operations
+ * to indicate the size of the retreived data.
+ *
+ * \note The length of the retrieved data stored into the Data buffer on GET operations should not exceed the initial value
+ * of the \c DataLength parameter.
+ *
+ * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state.
+ * \param[in] Property Property of the interface to get or set, a value from \ref Audio_ClassRequests_t.
+ * \param[in] EntityAddress Address of the audio entity whose property is being referenced.
+ * \param[in] Parameter Parameter of the entity to get or set, specific to each type of entity (see USB Audio specification).
+ * \param[in,out] DataLength For SET operations, the length of the parameter data to set. For GET operations, the maximum
+ * length of the retrieved data. When NULL, the function should return whether the given property
+ * and parameter is valid for the requested endpoint without reading or modifying the Data buffer.
+ * \param[in,out] Data Pointer to a location where the parameter data is stored for SET operations, or where
+ * the retrieved data is to be stored for GET operations.
+ *
+ * \return Boolean \c true if the property GET/SET was successful, \c false otherwise
+ */
+bool CALLBACK_Audio_Device_GetSetInterfaceProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
+ const uint8_t Property,
+ const uint8_t EntityAddress,
+ const uint16_t Parameter,
+ uint16_t* const DataLength,
+ uint8_t* Data)
+{
+ /* No audio interface entities in the device descriptor, thus no properties to get or set. */
return false;
}
projects / pub / USBasp.git / blobdiff