X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/ccf5bd19f2d750440043b242cf26fcda09b69cce..79efd8c79e723adb3392367ae62356c5c3a835d0:/LUFA/Drivers/USB/Class/Device/Audio.h diff --git a/LUFA/Drivers/USB/Class/Device/Audio.h b/LUFA/Drivers/USB/Class/Device/Audio.h index 0749d9536..cf79e15eb 100644 --- a/LUFA/Drivers/USB/Class/Device/Audio.h +++ b/LUFA/Drivers/USB/Class/Device/Audio.h @@ -28,26 +28,26 @@ this software. */ -/** \ingroup Group_USBDeviceClassDrivers - * @defgroup Group_USBClassAudioDevice Audio Device Class Driver - LUFA/Drivers/Class/Device/Audio.h +/** \ingroup Group_USBClassAudio + * @defgroup Group_USBClassAudioDevice Audio Class Device Mode Driver * * \section Sec_Dependencies Module Source Dependencies * The following files must be built with any user project that uses this module: * - LUFA/Drivers/USB/Class/Device/Audio.c * * \section Module Description - * Functions, macros, variables, enums and types related to the management of USB Audio Class interfaces - * within a USB device. + * Device Mode USB Class driver framework interface, for the Audio USB Class driver. * * @{ */ -#ifndef _AUDIO_CLASS_H_ -#define _AUDIO_CLASS_H_ +#ifndef _AUDIO_CLASS_DEVICE_H_ +#define _AUDIO_CLASS_DEVICE_H_ /* Includes: */ #include "../../USB.h" - + #include "../Common/Audio.h" + #include /* Enable C linkage for C++ Compilers: */ @@ -55,426 +55,218 @@ extern "C" { #endif - /* Macros: */ - /** Descriptor header constant to indicate a Audio class interface descriptor. */ - #define DTYPE_AudioInterface 0x24 - - /** Descriptor header constant to indicate a Audio class endpoint descriptor. */ - #define DTYPE_AudioEndpoint 0x25 - - /** Audio class descriptor subtype value for a Audio class specific header descriptor. */ - #define DSUBTYPE_Header 0x01 - - /** Audio class descriptor subtype value for an Output Terminal Audio class specific descriptor. */ - #define DSUBTYPE_InputTerminal 0x02 - - /** Audio class descriptor subtype value for an Input Terminal Audio class specific descriptor. */ - #define DSUBTYPE_OutputTerminal 0x03 - - /** Audio class descriptor subtype value for a Feature Unit Audio class specific descriptor. */ - #define DSUBTYPE_FeatureUnit 0x06 - - /** Audio class descriptor subtype value for a general Audio class specific descriptor. */ - #define DSUBTYPE_General 0x01 - - /** Audio class descriptor subtype value for an Audio class specific descriptor indicating the format of an audio stream. */ - #define DSUBTYPE_Format 0x02 + /* Public Interface - May be used in end-application: */ + /* Type Defines: */ + /** Class state structure. An instance of this structure should be made for each Audio interface + * within the user application, and passed to each of the Audio class driver functions as the + * AudioInterfaceInfo parameter. This stores each Audio interface's configuration and state information. + */ + typedef struct + { + const struct + { + uint8_t StreamingInterfaceNumber; /**< Index of the Audio Streaming interface within the device this + * structure controls + */ + + uint8_t DataINEndpointNumber; /**< Endpoint number of the incoming Audio Streaming data, if available + * (zero if unused) + */ + uint16_t DataINEndpointSize; /**< Size in bytes of the incoming Audio Streaming data endpoint, if available + * (zero if unused) + */ + + uint8_t DataOUTEndpointNumber; /**< Endpoint number of the outgoing Audio Streaming data, if available + * (zero if unused) + */ + uint16_t DataOUTEndpointSize; /**< Size in bytes of the outgoing Audio Streaming data endpoint, if available + * (zero if unused) + */ + } Config; /**< Config data for the USB class interface within the device. All elements in this section + * must be set or the interface will fail to enumerate and operate correctly. + */ + struct + { + bool InterfaceEnabled; /**< Set and cleared by the class driver to indicate if the host has enabled the streaming endpoints + * of the Audio Streaming interface. + */ + } State; /**< State data for the USB class interface within the device. All elements in this section + * are reset to their defaults when the interface is enumerated. + */ + } USB_ClassInfo_Audio_Device_t; - /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define CHANNEL_LEFT_FRONT (1 << 0) - - /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define CHANNEL_RIGHT_FRONT (1 << 1) - - /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define CHANNEL_CENTER_FRONT (1 << 2) - - /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define CHANNEL_LOW_FREQ_ENHANCE (1 << 3) - - /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define CHANNEL_LEFT_SURROUND (1 << 4) - - /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define CHANNEL_RIGHT_SURROUND (1 << 5) - - /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define CHANNEL_LEFT_OF_CENTER (1 << 6) - - /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define CHANNEL_RIGHT_OF_CENTER (1 << 7) - - /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define CHANNEL_SURROUND (1 << 8) - - /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define CHANNEL_SIDE_LEFT (1 << 9) - - /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define CHANNEL_SIDE_RIGHT (1 << 10) - - /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define CHANNEL_TOP (1 << 11) - - /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ - #define FEATURE_MUTE (1 << 0) - - /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ - #define FEATURE_VOLUME (1 << 1) - - /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ - #define FEATURE_BASS (1 << 2) - - /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ - #define FEATURE_MID (1 << 3) - - /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ - #define FEATURE_TREBLE (1 << 4) - - /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ - #define FEATURE_GRAPHIC_EQUALIZER (1 << 5) - - /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ - - /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ - #define FEATURE_AUTOMATIC_GAIN (1 << 6) - - /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ - #define FEATURE_DELAY (1 << 7) - - /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ - #define FEATURE_BASS_BOOST (1 << 8) - - /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */ - #define FEATURE_BASS_LOUDNESS (1 << 9) - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_UNDEFINED 0x0100 - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_STREAMING 0x0101 - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_VENDOR 0x01FF - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_IN_UNDEFINED 0x0200 - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_IN_MIC 0x0201 - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_IN_DESKTOP_MIC 0x0202 - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_IN_PERSONAL_MIC 0x0203 - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_IN_OMNIDIR_MIC 0x0204 - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_IN_MIC_ARRAY 0x0205 - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_IN_PROCESSING_MIC 0x0206 - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_IN_OUT_UNDEFINED 0x0300 - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_OUT_SPEAKER 0x0301 - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_OUT_HEADPHONES 0x0302 - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_OUT_HEAD_MOUNTED 0x0303 - - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_OUT_DESKTOP 0x0304 + /* Function Prototypes: */ + /** Configures the endpoints of a given Audio interface, ready for use. This should be linked to the library + * \ref EVENT_USB_Device_ConfigurationChanged() event so that the endpoints are configured when the configuration containing the + * given Audio interface is selected. + * + * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state + * + * \return Boolean true if the endpoints were successfully configured, false otherwise + */ + bool Audio_Device_ConfigureEndpoints(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1); + + /** Processes incoming control requests from the host, that are directed to the given Audio class interface. This should be + * linked to the library \ref EVENT_USB_Device_UnhandledControlRequest() event. + * + * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state + */ + void Audio_Device_ProcessControlRequest(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1); + + /** General management task for a given Audio class interface, required for the correct operation of the interface. This should + * be called frequently in the main program loop, before the master USB management task \ref USB_USBTask(). + * + * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state + */ + void Audio_Device_USBTask(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1); + + /** Determines if the given audio interface is ready for a sample to be read from it, and selects the streaming + * OUT endpoint ready for reading. + * + * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state + * + * \return Boolean true if the given Audio interface has a sample to be read, false otherwise + */ + bool Audio_Device_IsSampleReceived(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo); + + /** Determines if the given audio interface is ready to accept the next sample to be written to it, and selects + * the streaming IN endpoint ready for writing. + * + * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state + * + * \return Boolean true if the given Audio interface is ready to accept the next sample, false otherwise + */ + bool Audio_Device_IsReadyForNextSample(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo); + + /* Inline Functions: */ + /** Reads the next 8-bit audio sample from the current audio interface. + * + * \note This should be preceded immediately by a call to the USB_Audio_IsSampleReceived() function to ensure that + * the correct endpoint is selected and ready for data. + * + * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state + * + * \return Signed 8-bit audio sample from the audio interface + */ + static inline int8_t Audio_Device_ReadSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo) ATTR_ALWAYS_INLINE; + static inline int8_t Audio_Device_ReadSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo) + { + int8_t Sample; + + (void)AudioInterfaceInfo; + + Sample = Endpoint_Read_Byte(); + + if (!(Endpoint_BytesInEndpoint())) + Endpoint_ClearOUT(); + + return Sample; + } - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_OUT_ROOM 0x0305 + /** Reads the next 16-bit audio sample from the current audio interface. + * + * \note This should be preceded immediately by a call to the USB_Audio_IsSampleReceived() function to ensure that + * the correct endpoint is selected and ready for data. + * + * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state + * + * \return Signed 16-bit audio sample from the audio interface + */ + static inline int16_t Audio_Device_ReadSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo) ATTR_ALWAYS_INLINE; + static inline int16_t Audio_Device_ReadSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo) + { + int16_t Sample; + + (void)AudioInterfaceInfo; + + Sample = (int16_t)Endpoint_Read_Word_LE(); + + if (!(Endpoint_BytesInEndpoint())) + Endpoint_ClearOUT(); + + return Sample; + } - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_OUT_COMMUNICATION 0x0306 + /** Reads the next 24-bit audio sample from the current audio interface. + * + * \note This should be preceded immediately by a call to the USB_Audio_IsSampleReceived() function to ensure that + * the correct endpoint is selected and ready for data. + * + * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state + * \return Signed 24-bit audio sample from the audio interface + */ + static inline int32_t Audio_Device_ReadSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo) ATTR_ALWAYS_INLINE; + static inline int32_t Audio_Device_ReadSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo) + { + int32_t Sample; + + (void)AudioInterfaceInfo; + + Sample = (((uint32_t)Endpoint_Read_Byte() << 16) | Endpoint_Read_Word_LE()); + + if (!(Endpoint_BytesInEndpoint())) + Endpoint_ClearOUT(); + + return Sample; + } - /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */ - #define TERMINAL_OUT_LOWFREQ 0x0307 + /** Writes the next 8-bit audio sample to the current audio interface. + * + * \note This should be preceded immediately by a call to the USB_Audio_IsReadyForNextSample() function to ensure that + * the correct endpoint is selected and ready for data. + * + * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state + * \param[in] Sample Signed 8-bit audio sample + */ + static inline void Audio_Device_WriteSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo, + const int8_t Sample) ATTR_ALWAYS_INLINE; + static inline void Audio_Device_WriteSample8(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo, + const int8_t Sample) + { + Endpoint_Write_Byte(Sample); + + if (Endpoint_BytesInEndpoint() == AudioInterfaceInfo->Config.DataINEndpointSize) + Endpoint_ClearIN(); + } - /** Convenience macro, to fill a 24-bit AudioSampleFreq_t structure with the given sample rate as a 24-bit number. - * - * \param freq Required audio sampling frequency in HZ - */ - #define AUDIO_SAMPLE_FREQ(freq) {LowWord: ((uint32_t)freq & 0x00FFFF), HighByte: (((uint32_t)freq >> 16) & 0x0000FF)} - - /** Mask for the attributes parameter of an Audio class specific Endpoint descriptor, indicating that the endpoint - * accepts only filled endpoint packets of audio samples. - */ - #define EP_ACCEPTS_ONLY_FULL_PACKETS (1 << 7) - - /** Mask for the attributes parameter of an Audio class specific Endpoint descriptor, indicating that the endpoint - * will accept partially filled endpoint packets of audio samples. - */ - #define EP_ACCEPTS_SMALL_PACKETS (0 << 7) - - /* Type Defines: */ - /** Type define for an Audio class specific interface descriptor. This follows a regular interface descriptor to - * supply extra information about the audio device's layout to the host. See the USB Audio specification for more - * details. - */ - typedef struct - { - USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */ - uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */ - - uint16_t ACSpecification; /**< Binary coded decimal value, indicating the supported Audio Class specification version */ - uint16_t TotalLength; /**< Total length of the Audio class specific descriptors, including this descriptor */ - - uint8_t InCollection; /**< Total number of audio class interfaces within this device */ - uint8_t InterfaceNumbers[1]; /**< Interface numbers of each audio interface */ - } USB_AudioInterface_AC_t; - - /** Type define for an Audio class specific Feature Unit descriptor. This indicates to the host what features - * are present in the device's audio stream for basic control, such as per-channel volume. See the USB Audio - * specification for more details. - */ - typedef struct - { - USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */ - uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */ - - uint8_t UnitID; /**< ID value of this feature unit - must be a unique value within the device */ - uint8_t SourceID; /**< Source ID value of the audio source input into this feature unit */ - - uint8_t ControlSize; /**< Size of each element in the ChanelControlls array */ - uint8_t ChannelControls[3]; /**< Feature masks for the control channel, and each separate audio channel */ - - uint8_t FeatureUnitStrIndex; /**< Index of a string descriptor describing this descriptor within the device */ - } USB_AudioFeatureUnit_t; - - /** Type define for an Audio class specific input terminal descriptor. This indicates to the host that the device - * contains an input audio source, either from a physical terminal on the device, or a logical terminal (for example, - * a USB endpoint). See the USB Audio specification for more details. - */ - typedef struct - { - USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */ - uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */ - - uint8_t TerminalID; /**< ID value of this terminal unit - must be a unique value within the device */ - uint16_t TerminalType; /**< Type of terminal, a TERMINAL_* mask */ - uint8_t AssociatedOutputTerminal; /**< ID of associated output terminal, for physically grouped terminals - * such as the speaker and microphone of a phone handset - */ - uint8_t TotalChannels; /**< Total number of separate audio channels within this interface (right, left, etc.) */ - uint16_t ChannelConfig; /**< CHANNEL_* masks indicating what channel layout is supported by this terminal */ - - uint8_t ChannelStrIndex; /**< Index of a string descriptor describing this channel within the device */ - uint8_t TerminalStrIndex; /**< Index of a string descriptor describing this descriptor within the device */ - } USB_AudioInputTerminal_t; - - /** Type define for an Audio class specific output terminal descriptor. This indicates to the host that the device - * contains an output audio sink, either to a physical terminal on the device, or a logical terminal (for example, - * a USB endpoint). See the USB Audio specification for more details. - */ - typedef struct - { - USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */ - uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */ - - uint8_t TerminalID; /**< ID value of this terminal unit - must be a unique value within the device */ - uint16_t TerminalType; /**< Type of terminal, a TERMINAL_* mask */ - uint8_t AssociatedInputTerminal; /**< ID of associated input terminal, for physically grouped terminals - * such as the speaker and microphone of a phone handset - */ - uint8_t SourceID; /**< ID value of the unit this terminal's audio is sourced from */ - - uint8_t TerminalStrIndex; /**< Index of a string descriptor describing this descriptor within the device */ - } USB_AudioOutputTerminal_t; - - /** Type define for an Audio class specific streaming interface descriptor. This indicates to the host - * how audio streams within the device are formatted. See the USB Audio specification for more details. - */ - typedef struct - { - USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */ - uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */ - - uint8_t TerminalLink; /**< ID value of the output terminal this descriptor is describing */ - - uint8_t FrameDelay; /**< Delay in frames resulting from the complete sample processing from input to output */ - uint16_t AudioFormat; /**< Format of the audio stream, see Audio Device Formats specification */ - } USB_AudioInterface_AS_t; - - /** Type define for a 24bit audio sample frequency structure. GCC does not contain a built in 24bit datatype, - * this this structure is used to build up the value instead. Fill this structure with the SAMPLE_FREQ() macro. - */ - typedef struct - { - uint16_t LowWord; /**< Low 16 bits of the 24-bit value */ - uint8_t HighByte; /**< Upper 8 bits of the 24-bit value */ - } AudioSampleFreq_t; - - /** Type define for an Audio class specific audio format descriptor. This is used to give the host full details - * about the number of channels, the sample resolution, acceptable sample frequencies and encoding method used - * in the device's audio streams. See the USB Audio specification for more details. - */ - typedef struct - { - USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */ - uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */ - - uint8_t FormatType; /**< Format of the audio stream, see Audio Device Formats specification */ - uint8_t Channels; /**< Total number of discrete channels in the stream */ - - uint8_t SubFrameSize; /**< Size in bytes of each channel's sample data in the stream */ - uint8_t BitResolution; /**< Bits of resolution of each channel's samples in the stream */ + /** Writes the next 16-bit audio sample to the current audio interface. + * + * \note This should be preceded immediately by a call to the USB_Audio_IsReadyForNextSample() function to ensure that + * the correct endpoint is selected and ready for data. + * + * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state + * \param[in] Sample Signed 16-bit audio sample + */ + static inline void Audio_Device_WriteSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo, + const int16_t Sample) ATTR_ALWAYS_INLINE; + static inline void Audio_Device_WriteSample16(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo, + const int16_t Sample) + { + Endpoint_Write_Word_LE(Sample); + + if (Endpoint_BytesInEndpoint() == AudioInterfaceInfo->Config.DataINEndpointSize) + Endpoint_ClearIN(); + } - uint8_t SampleFrequencyType; /**< Total number of sample frequencies supported by the device */ - AudioSampleFreq_t SampleFrequencies[1]; /**< Sample frequencies supported by the device */ - } USB_AudioFormat_t; - - /** Type define for an Audio class specific endpoint descriptor. This contains a regular endpoint - * descriptor with a few Audio-class specific extensions. See the USB Audio specification for more details. - */ - typedef struct - { - USB_Descriptor_Endpoint_t Endpoint; /**< Standard endpoint descriptor describing the audio endpoint */ - - uint8_t Refresh; /**< Always set to zero */ - uint8_t SyncEndpointNumber; /**< Endpoint address to send synchronisation information to, if needed (zero otherwise) */ - } USB_AudioStreamEndpoint_Std_t; - - /** Type define for an Audio class specific extended endpoint descriptor. This contains extra information - * on the usage of endpoints used to stream audio in and out of the USB Audio device, and follows an Audio - * class specific extended endpoint descriptor. See the USB Audio specification for more details. - */ - typedef struct - { - USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */ - uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */ - - uint8_t Attributes; /**< Audio class specific endpoint attributes, such as ACCEPTS_SMALL_PACKETS */ - - uint8_t LockDelayUnits; /**< Units used for the LockDelay field, see Audio class specification */ - uint16_t LockDelay; /**< Time required to internally lock endpoint's internal clock recovery circuitry */ - } USB_AudioStreamEndpoint_Spc_t; - - /** Class state structure. An instance of this structure should be made for each Audio interface - * within the user application, and passed to each of the Audio class driver functions as the - * AudioInterfaceInfo parameter. The contents of this structure should be set to their correct - * values when used, or ommitted to force the library to use default values. - */ - typedef struct - { - uint8_t StreamingInterfaceNumber; /**< Index of the Audio Streaming interface within the device this structure controls */ - - uint8_t DataINEndpointNumber; /**< Endpoint number of the incomming Audio Streaming data, if available (zero if unused) */ - uint16_t DataINEndpointSize; /**< Size in bytes of the incomming Audio Streaming data endpoint, if available (zero if unused) */ - - uint8_t DataOUTEndpointNumber; /**< Endpoint number of the outgoing Audio Streaming data, if available (zero if unused) */ - uint16_t DataOUTEndpointSize; /**< Size in bytes of the outgoing Audio Streaming data endpoint, if available (zero if unused) */ - - bool InterfaceEnabled; /**< Set and cleared by the class driver to indicate if the host has enabled the streaming endpoints - * of the Audio Streaming interface - */ - } USB_ClassInfo_Audio_t; - - /* Function Prototypes: */ - /** Configures the endpoints of a given Audio interface, ready for use. This should be linked to the library - * \ref EVENT_USB_ConfigurationChanged() event so that the endpoints are configured when the configuration containing the - * given Audio interface is selected. - * - * \param AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state. - * - * \return Boolean true if the endpoints were sucessfully configured, false otherwise - */ - bool USB_Audio_ConfigureEndpoints(USB_ClassInfo_Audio_t* AudioInterfaceInfo); - - /** Processes incomming control requests from the host, that are directed to the given Audio class interface. This should be - * linked to the library \ref EVENT_USB_UnhandledControlPacket() event. - * - * \param AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state. - */ - void USB_Audio_ProcessControlPacket(USB_ClassInfo_Audio_t* AudioInterfaceInfo); - - /** General management task for a given Audio class interface, required for the correct operation of the interface. This should - * be called frequently in the main program loop, before the master USB management task \ref USB_USBTask(). - * - * \param AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state. - */ - void USB_Audio_USBTask(USB_ClassInfo_Audio_t* AudioInterfaceInfo); - - /** Reads the next 8-bit audio sample from the current audio interface. - * - * \note This should be preceeded immediately by a call to the USB_Audio_IsSampleReceived() function to ensure that - * the correct endpoint is selected and ready for data. - * - * \return Signed 8-bit audio sample from the audio interface - */ - int8_t USB_Audio_ReadSample8(void); - - /** Reads the next 16-bit audio sample from the current audio interface. - * - * \note This should be preceeded immediately by a call to the USB_Audio_IsSampleReceived() function to ensure that - * the correct endpoint is selected and ready for data. - * - * \return Signed 16-bit audio sample from the audio interface - */ - int16_t USB_Audio_ReadSample16(void); - - /** Reads the next 24-bit audio sample from the current audio interface. - * - * \note This should be preceeded immediately by a call to the USB_Audio_IsSampleReceived() function to ensure that - * the correct endpoint is selected and ready for data. - * - * \return Signed 24-bit audio sample from the audio interface - */ - int32_t USB_Audio_ReadSample24(void); - - /** Writes the next 8-bit audio sample to the current audio interface. - * - * \note This should be preceeded immediately by a call to the USB_Audio_IsReadyForNextSample() function to ensure that - * the correct endpoint is selected and ready for data. - * - * \param Sample Signed 8-bit audio sample - */ - void USB_Audio_WriteSample8(int8_t Sample); - - /** Writes the next 16-bit audio sample to the current audio interface. - * - * \note This should be preceeded immediately by a call to the USB_Audio_IsReadyForNextSample() function to ensure that - * the correct endpoint is selected and ready for data. - * - * \param Sample Signed 16-bit audio sample - */ - void USB_Audio_WriteSample16(int16_t Sample); - - /** Writes the next 24-bit audio sample to the current audio interface. - * - * \note This should be preceeded immediately by a call to the USB_Audio_IsReadyForNextSample() function to ensure that - * the correct endpoint is selected and ready for data. - * - * \param Sample Signed 24-bit audio sample - */ - void USB_Audio_WriteSample24(int32_t Sample); - - /** Determines if the given audio interface is ready for a sample to be read from it. - * - * \param AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state. - * - * \return Boolean true if the given Audio interface has a sample to be read, false otherwise - */ - bool USB_Audio_IsSampleReceived(USB_ClassInfo_Audio_t* AudioInterfaceInfo); - - /** Determines if the given audio interface is ready to accept the next sample to be written to it. - * - * \param AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state. - * - * \return Boolean true if the given Audio interface is ready to accept the next sample, false otherwise - */ - bool USB_Audio_IsReadyForNextSample(USB_ClassInfo_Audio_t* AudioInterfaceInfo); + /** Writes the next 24-bit audio sample to the current audio interface. + * + * \note This should be preceded immediately by a call to the USB_Audio_IsReadyForNextSample() function to ensure that + * the correct endpoint is selected and ready for data. + * + * \param[in,out] AudioInterfaceInfo Pointer to a structure containing an Audio Class configuration and state + * \param[in] Sample Signed 24-bit audio sample + */ + static inline void Audio_Device_WriteSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo, + const int32_t Sample) ATTR_ALWAYS_INLINE; + static inline void Audio_Device_WriteSample24(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo, + const int32_t Sample) + { + Endpoint_Write_Byte(Sample >> 16); + Endpoint_Write_Word_LE(Sample); + + if (Endpoint_BytesInEndpoint() == AudioInterfaceInfo->Config.DataINEndpointSize) + Endpoint_ClearIN(); + } /* Disable C linkage for C++ Compilers: */ #if defined(__cplusplus)