Omega Speaker Systems TC-08 manual Handle any error conditions if result ==

Technical reference

19

Example

The following code is a fragment of a C application which demonstrates how to open a

single unit with the asynchronous open unit functions:

//======================================================

//Opening a unit asynchronously //======================================================

//Tell the driver to start enumerating the unit in the background

//(usb_tc08_open_unit_async returns immediately)

result = usb_tc08_open_unit_async();

//handle any error conditions if (result == -1)

{

error_code = usb_tc08_get_last_error(0);

printf("Unit failed to open\nThe error code is %d", error_code);

//could terminate the application here

}

else if (result == 0)

{

printf("No USB TC08 units found");

//could terminate the application here

}

//No errors, so start polling usb_tc08_open_unit_progress

//continuously for its enumeration state

do

{

result = usb_tc08_open_unit_progress(&handle, &progress);

switch (result)

{

case USBTC08_PROGRESS_FAIL: // enum equates to: -1error_code = usb_tc08_get_last_error(0);

printf("Unit failed to open\nThe error code is %d", error_code);

//could terminate the application here break;

case USBTC08_PROGRESS_PENDING: // enum equates to: 0 printf("\nThe unit is %d percent enumerated", progress); Sleep(500); // wait for approx. half a second

break;

case USBTC08_PROGRESS_COMPLETE: // enum equates to: 1 printf("\n\nThe unit with handle '%d', opened successfully",

handle); break;

}

}

while (result == USBTC08_PROGRESS_PENDING);

//

//Start using the open unit