1.12  Programmation USB mode utilisateur (2/2)

• Fonctions de communication bloquantes :
  • fonctions déconseillées ;
  • tube de contrôle :

    int typ=LIBUSB_REQUEST_TYPE_xxx; /* see libusb.h */
    int req=LIBUSB_REQUEST_yyy    ;  /* see libusb.h */
    int val=...;          /* parameter for req */
    int ind=...;          /* parameter for req */
    char data[MAX_DATA];  /* data to send or to receive */
    int size=...;         /* size to send or maximum size to receive */
    int timeout=...;      /* timeout in ms */
    int nb_bytes=libusb_control_transfer(handle,typ,req,val,ind,data,size,timeout);
    

  • tube pour interruptions :

    int endpoint_out=...;   /* ID of endpoint (bit 8 is 0) */
    int endpoint_in=...;    /* ID of endpoint (bit 8 is 1) */
    char data[MAX_DATA];    /* data to send or to receive */
    int size=...;           /* size to send or maximum size to receive */
    int timeout=...;        /* timeout in ms */
    /* OUT interrupt, from host to device */
    int bytes_out;
    int status=libusb_interrupt_transfer(handle,endpoint_out,data,size,&bytes_out,timeout);
    if(status!=0){ perror("libusb_interrupt_transfer"); exit(-1); }
    /* IN interrupt, host polling device */
    int bytes_in;
    int status=libusb_interrupt_transfer(handle,endpoint_in,data,size,&bytes_in,timeout);
    if(status!=0){ perror("libusb_interrupt_transfer"); exit(-1); }
    

  • tube pour transfert de volume :

    int endpoint_out=...;   /* ID of endpoint (bit 8 is 0) */
    int endpoint_in=...;    /* ID of endpoint (bit 8 is 1) */
    char data[MAX_DATA];    /* data to send or to receive */
    int size=...;           /* size to send or maximum size to receive */
    int timeout=...;        /* timeout in ms */
    /* OUT bulk transfer */
    int bytes_out;
    int status=libusb_bulk_transfer(handle,endpoint_out,data,size,&bytes_out,timeout);
    if(status!=0){ perror("libusb_bulk_transfer"); exit(-1); }
    /* IN bulk transfer */
    int bytes_in;
    int status=libusb_bulk_transfer(handle,endpoint_in,data,size,&bytes_in,timeout);
    if(status!=0){ perror("libusb_bulk_transfer"); exit(-1); }
    

• Fonctions de communication asynchrones :
  • un système de programmation par événements ;
  • tube isodromique implanté.