www.pudn.com > 8255_code_lib.rar > DIOFNC02.C

/*- 
 *  ---------------------------------------------------------------------- 
 *  File        :   DIOFNC02.C 
 *  Creator     :   Blake Miller 
 *  Version     :   01.01.00        February 1991 
 *  Language    :   Microsoft C     Version 5.1 
 *  Purpose     :   Intel 8255 Compatible Digital IO Functions 
 *                  Set 8255 Mode Function 
 *  ---------------------------------------------------------------------- 
 *  Revision History: 
 *  022891 BVM  :   Change int to short. 
 *  070490 BVM  :   Creation 
 *  ---------------------------------------------------------------------- 
 */ 
 
#define     DIOFNC02_C_DEFINED  1 
#include    "DIOLIB.H" 
#undef      DIOFNC02_C_DEFINED 
 
void dio_config (DIODAT *, short, short, short, short); 
 
/*- DIO : Configure --------------------------** 
 *  Configure the 8255 for all ports in Mode 0. 
 *  Pass a short representing the IN or OUT state for each port. 
 *  TRUE (!0) will mean input, and FALSE (0) will mean output. 
 *  Passed: 
 *      pointer :   DIODAT 
 *      short   :   direction Port A 
 *      short   :   direction Port B 
 *      short   :   direction Port C Low 
 *      short   :   direction Port C High 
 *  Returns: 
 *      nothing 
 */ 
void dio_config (DIODAT *data, short pa_dir, short pb_dir, 
							   short cl_dir, short ch_dir) 
	{ 
 
	/*  Initially set mode to DIO_SET since we are 
	 *  going to configure the 8255. 
	 *  Then OR in the IO direction bits as appropriate. 
	 */ 
 
	data->mode = DIO_SET; 
 
	if ( pa_dir )   data->mode |= DIO_PA_IN; 
	if ( pb_dir )   data->mode |= DIO_PB_IN; 
	if ( cl_dir )   data->mode |= DIO_CL_IN; 
	if ( ch_dir )   data->mode |= DIO_CH_IN; 
 
	dio_bput ( data->base + DIO_CNTRL, data->mode ); 
	data->stat = DIO_ST_OK; 
	} 
 
/*- 
 *  ---------------------------------------------------------------------- 
 *  END DIOFNC02.C Source File 
 *  ---------------------------------------------------------------------- 
 */