diff options
Diffstat (limited to 'Demos/Device/ClassDriver/AudioOutput')
| -rw-r--r-- | Demos/Device/ClassDriver/AudioOutput/AudioOutput.c | 74 | ||||
| -rw-r--r-- | Demos/Device/ClassDriver/AudioOutput/Descriptors.c | 16 | ||||
| -rw-r--r-- | Demos/Device/ClassDriver/AudioOutput/Descriptors.h | 5 |
3 files changed, 85 insertions, 10 deletions
diff --git a/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c b/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c index dbfd10b8b..43267b2a7 100644 --- a/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c +++ b/Demos/Device/ClassDriver/AudioOutput/AudioOutput.c @@ -51,6 +51,9 @@ USB_ClassInfo_Audio_Device_t Speaker_Audio_Interface = }, }; +/** Current audio sampling frequency of the streaming audio endpoint. */ +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. @@ -135,7 +138,7 @@ 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 @@ -199,3 +202,72 @@ void EVENT_USB_Device_ControlRequest(void) Audio_Device_ProcessControlRequest(&Speaker_Audio_Interface); } +/** Audio class driver callback for the setting and retrieval of streaming endpoint properties. This callback must be implemented + * in the user application to handle property manipulations on streaming audio endpoints. + * + * When the DataLength parameter is NULL, this callback should only indicate whether the specified operation is valid for + * the given endpoint index, 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] 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] 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 + * 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 true if the property get/set was successful, 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) +{ + /* Check the requested endpoint to see if a supported endpoint is being manipulated */ + if (EndpointIndex == Speaker_Audio_Interface.Config.DataOUTEndpointNumber) + { + /* 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) + { + /* 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; + } + } + } + + return false; +} diff --git a/Demos/Device/ClassDriver/AudioOutput/Descriptors.c b/Demos/Device/ClassDriver/AudioOutput/Descriptors.c index e46c3c023..5bb0e9f11 100644 --- a/Demos/Device/ClassDriver/AudioOutput/Descriptors.c +++ b/Demos/Device/ClassDriver/AudioOutput/Descriptors.c @@ -54,7 +54,7 @@ const USB_Descriptor_Device_t PROGMEM DeviceDescriptor = .Endpoint0Size = FIXED_CONTROL_ENDPOINT_SIZE, .VendorID = 0x03EB, - .ProductID = 0x2046, + .ProductID = 0x206C, .ReleaseNumber = VERSION_BCD(00.01), .ManufacturerStrIndex = 0x01, @@ -191,7 +191,9 @@ const USB_Descriptor_Configuration_t PROGMEM ConfigurationDescriptor = .Audio_AudioFormat = { - .Header = {.Size = sizeof(USB_Audio_Descriptor_Format_t), .Type = DTYPE_CSInterface}, + .Header = {.Size = sizeof(USB_Audio_Descriptor_Format_t) + + sizeof(ConfigurationDescriptor.Audio_AudioFormatSampleRates), + .Type = DTYPE_CSInterface}, .Subtype = AUDIO_DSUBTYPE_CSInterface_FormatType, .FormatType = 0x01, @@ -200,12 +202,16 @@ const USB_Descriptor_Configuration_t PROGMEM ConfigurationDescriptor = .SubFrameSize = 0x02, .BitResolution = 16, - .TotalDiscreteSampleRates = 1, + .TotalDiscreteSampleRates = (sizeof(ConfigurationDescriptor.Audio_AudioFormatSampleRates) / sizeof(USB_Audio_SampleFreq_t)), }, .Audio_AudioFormatSampleRates = { - AUDIO_SAMPLE_FREQ(AUDIO_SAMPLE_FREQUENCY) + AUDIO_SAMPLE_FREQ(8000), + AUDIO_SAMPLE_FREQ(11025), + AUDIO_SAMPLE_FREQ(22050), + AUDIO_SAMPLE_FREQ(44100), + AUDIO_SAMPLE_FREQ(48000), }, .Audio_StreamEndpoint = @@ -229,7 +235,7 @@ const USB_Descriptor_Configuration_t PROGMEM ConfigurationDescriptor = .Header = {.Size = sizeof(USB_Audio_Descriptor_StreamEndpoint_Spc_t), .Type = DTYPE_CSEndpoint}, .Subtype = AUDIO_DSUBTYPE_CSEndpoint_General, - .Attributes = AUDIO_EP_ACCEPTS_SMALL_PACKETS, + .Attributes = (AUDIO_EP_ACCEPTS_SMALL_PACKETS | AUDIO_EP_SAMPLE_FREQ_CONTROL), .LockDelayUnits = 0x00, .LockDelay = 0x0000 diff --git a/Demos/Device/ClassDriver/AudioOutput/Descriptors.h b/Demos/Device/ClassDriver/AudioOutput/Descriptors.h index b4b8db6a4..ca5c87386 100644 --- a/Demos/Device/ClassDriver/AudioOutput/Descriptors.h +++ b/Demos/Device/ClassDriver/AudioOutput/Descriptors.h @@ -51,9 +51,6 @@ */ #define AUDIO_STREAM_EPSIZE ENDPOINT_MAX_SIZE(AUDIO_STREAM_EPNUM) - /** Sample frequency of the data being transmitted through the streaming endpoint. */ - #define AUDIO_SAMPLE_FREQUENCY 48000 - /* Type Defines: */ /** Type define for the device configuration descriptor structure. This must be defined in the * application code, as the configuration descriptor contains several sub-descriptors which @@ -70,7 +67,7 @@ USB_Descriptor_Interface_t Audio_StreamInterface_Alt1; USB_Audio_Descriptor_Interface_AS_t Audio_StreamInterface_SPC; USB_Audio_Descriptor_Format_t Audio_AudioFormat; - USB_Audio_SampleFreq_t Audio_AudioFormatSampleRates[1]; + USB_Audio_SampleFreq_t Audio_AudioFormatSampleRates[5]; USB_Audio_Descriptor_StreamEndpoint_Std_t Audio_StreamEndpoint; USB_Audio_Descriptor_StreamEndpoint_Spc_t Audio_StreamEndpoint_SPC; } USB_Descriptor_Configuration_t; |