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Opening a link to a calculator connected by USB

In order to open the link to the calculator, the steps are the following:

1. Call cahute_open_simple_usb_link() with the device address.

2. Profit!

3. Call cahute_close_link() to close the link.

Note

If there are multiple calculators connected by USB to your system, you can manage multiple or a specific subset of them by:

• Detecting available USB devices using cahute_detect_usb(). See Listing calculators connected by USB for steps to do so;

• Opening a link to a specific USB device using cahute_open_usb_link().

An example program to do this is the following:

/* Compile using: gcc open-usb-link.c `pkg-config cahute --cflags --libs`. */

#include <stdio.h>
#include <cahute.h>

int main(void) {
    cahute_link *link;
    int err;

    err = cahute_open_simple_usb_link(&link, 0);
    if (err) {
        fprintf(
            stderr,
            "cahute_open_simple_usb_link() has returned error 0x%04X.\n",
            err
        );
        return 1;
    }

    /* Profit! */
    printf("Link successfully opened!\n");

    cahute_close_link(link);
    return 0;
}