Subversion Repositories usb_fpga_2_04

/*!

   UCEcho -- C host software for ucecho examples

   Copyright (C) 2009-2014 ZTEX GmbH.

   http://www.ztex.de

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License version 3 as

   published by the Free Software Foundation.

   This program is distributed in the hope that it will be useful, but

   WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

   General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, see http://www.gnu.org/licenses/.

!*/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <usb.h>

#define BUFSIZE  256

struct usb_device *device;

usb_dev_handle *handle;

char buf[BUFSIZE];

// find the first ucecho device

struct usb_device *find_device ()

{

    struct usb_bus *bus_search;

    struct usb_device *device_search;

    bus_search = usb_busses;

    while (bus_search != NULL)

    {

        device_search = bus_search->devices;

        while (device_search != NULL)

        {

            if ( (device_search->descriptor.idVendor == 0x221a) && (device_search->descriptor.idProduct == 0x100) )

            {

                handle = usb_open(device_search);

                usb_get_string_simple(handle, device_search->descriptor.iProduct, buf, BUFSIZE);

                if ( ! strncmp("ucecho", buf , 6 )  )

                    return device_search;

                usb_close(handle);

            }

            device_search = device_search->next;

        }

        bus_search = bus_search->next;

    }

    return NULL;

}

// main

int main(int argc, char *argv[])

{

    usb_init();                                         // initializing libusb

    usb_find_busses();                                  // ... finding busses

    usb_find_devices();                                 // ... and devices

    device = find_device();                             // find the device (hopefully the correct one)

    if ( device == NULL ) {                             // nothing found

        fprintf(stderr, "Cannot find ucecho device\n");

        return 1;

    }

    if (usb_claim_interface(handle, 0) < 0) {

        fprintf(stderr, "Error claiming interface 0: %s\n", usb_strerror());

        return 1;

    }

    while ( strcmp("QUIT", buf) ) {

        // read string from stdin

        printf("Enter a string or `quit' to exit the program: ");

        scanf("%s", buf);

        // write string to ucecho device 

        int i = usb_bulk_write(handle, 0x04, buf, strlen(buf)+1, 1000);

        if ( i < 0 ) {

            fprintf(stderr, "Error sending data: %s\n", usb_strerror());

            return 1;

        }

        printf("Send %d bytes: `%s'\n", i , buf);

        // read string back from ucecho device 

        i = usb_bulk_read(handle, 0x82, buf, BUFSIZE, 1000);

        if ( i < 0 ) {

            fprintf(stderr, "Error readin data: %s\n", usb_strerror());

            return 1;

        }

        printf("Read %d bytes: `%s'\n", i , buf);

    }

    usb_release_interface(handle, 0);

    usb_close(handle);

    return 0;

}