Diff: USBAudio/USBAudio.h

Revision:

1:80ab0d068708

Child:

4:eaa07ce86d49

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBAudio/USBAudio.h	Tue Jul 17 14:30:29 2012 +0000
@@ -0,0 +1,286 @@
+/* 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
+*
+* #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