14dfl4.txt
;**************************************************************************************************
; LISTING 4 - ISR-SERVICING CODE
;
; "Get those boards talking under Linux," EDN, July 6, 2000, pg 128
;
; http://www.ednmag.com/ednmag/reg/2000/070600/14df.htm
;**************************************************************************************************

static int pd_isr_serve_board(int board) 
{
   ...
    // check if interrupt came from a specific card
    if ( ! pd_check_int_request(board)) 
       return 0; 	// this board not waiting for service
    pd_ack_int_request(board); 	// acknowledge the interrupt
    // do whatever necessary to service interrupt request, for example
    pd_get_status(board, &status);
    if (status & BRD_DATA_AVAILABLE)
        ... 	// proceed according with board status
    	// schedule bottom half of ISR to run
    pd_schedule_dpc(board, board_dpc_proc);
    return 1;
}