source: thomson/elec/CrO2/software/device.h@ e017851

/* CrO2 datassette emulator
 * Copyright 2012, Adrien Destugues <pulkomandy@pulkomandy.ath.cx>
 *
 * Distributed under the terms of the MIT licence.
 *
 * Handles device communication through libusb
 */

#include <stdint.h>
#include <string.h>

class Tape;

class Device
{
        public:
                // Implemented in subclasses object files. Only one of them is linked
                // and takes care of instanciating itself.
                static Device& getDevice() throw(const char*);

                // High-level layer (will call functions below)
                void write(const Tape& file) throw (const char*);

                // Low-level layer (to be implemented by subclasses
                virtual int read(uint8_t* buffer, size_t max) = 0;
                        // Fill the buffer with data from device
                virtual int write(const uint8_t* buffer, size_t size, int blktype) = 0;
                virtual uint8_t getStatus() = 0;
                        // Get the status word from the device

        protected:
                /* These are the vendor specific commands implemented by our USB device */
                static const int PSCMD_CONFIG = 0;
                static const int PSCMD_GET = 1;
                static const int PSCMD_PUT = 2;
                static const int PSCMD_STATUS = 3;

                static const uint32_t vid;
                static const uint32_t pid;
                static const char* vendor;
                static const char* product;
        private:
                static bool initOnce;
                static Device* instance;
};