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tmk_keyboard/tool/mbed/mbed-sdk/libraries/USBDevice/USBAudio/USBAudio.h

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/* 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 EPISO_OUT_callback();
/*
* Callback called when a packet has been sent
*/
virtual bool EPISO_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