![](/media/cache/img/default_profile.jpg.50x50_q85.jpg)
The preloaded firmware shipped on the mBot.
Please use the version of this project/repo found at: http://developer.mbed.org/teams/Outrageous-Circuits/code/Official_mBot/
USBDevice/USBAudio/USBAudio.h
- Committer:
- jeffknaggs
- Date:
- 2014-11-25
- Revision:
- 0:865d42c46692
File content as of revision 0:865d42c46692:
/* Copyright (c) 2010-2011 mbed.org, MIT License * * Permission is hereby granted, free of charge, to any person obtaining a copy of this software * and associated documentation files (the "Software"), to deal in the Software without * restriction, including without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all copies or * substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef USBAudio_H #define USBAudio_H /* These headers are included for child class. */ #include "USBEndpoints.h" #include "USBDescriptor.h" #include "USBDevice_Types.h" #include "USBDevice.h" /** * USBAudio example * * @code * #include "mbed.h" * #include "USBAudio.h" * * Serial pc(USBTX, USBRX); * * // frequency: 48 kHz * #define FREQ 48000 * * // 1 channel: mono * #define NB_CHA 1 * * // length of an audio packet: each ms, we receive 48 * 16bits ->48 * 2 bytes. as there is one channel, the length will be 48 * 2 * 1 * #define AUDIO_LENGTH_PACKET 48 * 2 * 1 * * // USBAudio * USBAudio audio(FREQ, NB_CHA); * * int main() { * int16_t buf[AUDIO_LENGTH_PACKET/2]; * * while (1) { * // read an audio packet * audio.read((uint8_t *)buf); * * * // print packet received * pc.printf("recv: "); * for(int i = 0; i < AUDIO_LENGTH_PACKET/2; i++) { * pc.printf("%d ", buf[i]); * } * pc.printf("\r\n"); * } * } * @endcode */ class USBAudio: public USBDevice { public: /** * Constructor * * @param frequency_in frequency in Hz (default: 48000) * @param channel_nb_in channel number (1 or 2) (default: 1) * @param frequency_out frequency in Hz (default: 8000) * @param channel_nb_out_in channel number (1 or 2) (default: 1) * @param vendor_id Your vendor_id * @param product_id Your product_id * @param product_release Your preoduct_release */ USBAudio(uint32_t frequency_in = 48000, uint8_t channel_nb_in = 1, uint32_t frequency_out = 8000, uint8_t channel_nb_out = 1, uint16_t vendor_id = 0x7bb8, uint16_t product_id = 0x1111, uint16_t product_release = 0x0100); /** * Get current volume between 0.0 and 1.0 * * @returns volume */ float getVolume(); /** * Read an audio packet. During a frame, only a single reading (you can't write and read an audio packet during the same frame)can be done using this method. Warning: Blocking * * @param buf pointer on a buffer which will be filled with an audio packet * * @returns true if successfull */ bool read(uint8_t * buf); /** * Try to read an audio packet. During a frame, only a single reading (you can't write and read an audio packet during the same frame)can be done using this method. Warning: Non Blocking * * @param buf pointer on a buffer which will be filled if an audio packet is available * * @returns true if successfull */ bool readNB(uint8_t * buf); /** * Write an audio packet. During a frame, only a single writing (you can't write and read an audio packet during the same frame)can be done using this method. * * @param buf pointer on the audio packet which will be sent * @returns true if successful */ bool write(uint8_t * buf); /** * Write and read an audio packet at the same time (on the same frame) * * @param buf_read pointer on a buffer which will be filled with an audio packet * @param buf_write pointer on the audio packet which will be sent * @returns true if successful */ bool readWrite(uint8_t * buf_read, uint8_t * buf_write); /** attach a handler to update the volume * * @param function Function to attach * */ void attach(void(*fptr)(void)) { updateVol.attach(fptr); } /** Attach a nonstatic void/void member function to update the volume * * @param tptr Object pointer * @param mptr Member function pointer * */ template<typename T> void attach(T *tptr, void(T::*mptr)(void)) { updateVol.attach(tptr, mptr); } protected: /* * Called by USBDevice layer. Set configuration of the device. * For instance, you can add all endpoints that you need on this function. * * @param configuration Number of the configuration * @returns true if class handles this request */ virtual bool USBCallback_setConfiguration(uint8_t configuration); /* * Called by USBDevice on Endpoint0 request. Warning: Called in ISR context * This is used to handle extensions to standard requests * and class specific requests * * @returns true if class handles this request */ virtual bool USBCallback_request(); /* * Get string product descriptor * * @returns pointer to the string product descriptor */ virtual uint8_t * stringIproductDesc(); /* * Get string interface descriptor * * @returns pointer to the string interface descriptor */ virtual uint8_t * stringIinterfaceDesc(); /* * Get configuration descriptor * * @returns pointer to the configuration descriptor */ virtual uint8_t * configurationDesc(); /* * Called by USBDevice layer. Set interface/alternate of the device. * * @param interface Number of the interface to be configured * @param alternate Number of the alternate to be configured * @returns true if class handles this request */ virtual bool USBCallback_setInterface(uint16_t interface, uint8_t alternate); /* * Called by USBDevice on Endpoint0 request completion * if the 'notify' flag has been set to true. Warning: Called in ISR context * * In this case it is used to indicate that a HID report has * been received from the host on endpoint 0 * * @param buf buffer received on endpoint 0 * @param length length of this buffer */ virtual void USBCallback_requestCompleted(uint8_t * buf, uint32_t length); /* * Callback called on each Start of Frame event */ virtual void SOF(int frameNumber); /* * Callback called when a packet is received */ virtual bool EP3_OUT_callback(); /* * Callback called when a packet has been sent */ virtual bool EP3_IN_callback(); private: // stream available ? volatile bool available; // interrupt OUT has been received volatile bool interruptOUT; // interrupt IN has been received volatile bool interruptIN; // audio packet has been written volatile bool writeIN; // FREQ uint32_t FREQ_OUT; uint32_t FREQ_IN; // size of the maximum packet for the isochronous endpoint uint32_t PACKET_SIZE_ISO_IN; uint32_t PACKET_SIZE_ISO_OUT; // mono, stereo,... uint8_t channel_nb_in; uint8_t channel_nb_out; // channel config: master, left, right uint8_t channel_config_in; uint8_t channel_config_out; // mute state uint8_t mute; // Volume Current Value uint16_t volCur; // Volume Minimum Value uint16_t volMin; // Volume Maximum Value uint16_t volMax; // Volume Resolution uint16_t volRes; // Buffer containing one audio packet (to be read) volatile uint8_t * buf_stream_in; // Buffer containing one audio packet (to be written) volatile uint8_t * buf_stream_out; // callback to update volume FunctionPointer updateVol; // boolean showing that the SOF handler has been called. Useful for readNB. volatile bool SOF_handler; volatile float volume; }; #endif