www.pudn.com > 8255_code_lib.rar > I8255F02.C

/*- 
 *  ---------------------------------------------------------------------- 
 *  File        :   I8255F02.C 
 *  Creator     :   Blake Miller 
 *  Version     :   01.00.00        February 1991 
 *  Language    :   Microsoft C     Version 5.1 
 *  Purpose     :   Intel 8255 Compatible Digital IO Functions 
 *              :   Set 8255 Mode Function 
 *  ---------------------------------------------------------------------- 
 */ 
 
#define  I8255F02_C_DEFINED  1 
#include "I8255FN.H" 
#undef   I8255F02_C_DEFINED 
 
void I8255_config (I8255DAT *data, int pa_dir, int pb_dir, 
								   int cl_dir, int ch_dir); 
 
/*- I8255 : Configure ------------------------** 
 *  Configure the 8255 for all ports in Mode 0. 
 *  Pass an integer representing the IN or OUT state for each port. 
 *  TRUE (!0) will mean input, and FALSE (0) will mean output. 
 *  Passed: 
 *      pointer :   I8255DAT 
 *      integer :   direction Port A 
 *      integer :   direction Port B 
 *      integer :   direction Port C Low 
 *      integer :   direction Port C High 
 *  Returns: 
 *      nothing 
 */ 
void I8255_config (I8255DAT *data, int pa_dir, int pb_dir, 
								   int cl_dir, int ch_dir ) 
	{ 
 
	/*  Initially set mode to I8255_SET since we are 
	 *  going to configure the 8255. 
	 *  Then OR in the IO direction bits as appropriate. 
	 */ 
 
	data->mode = I8255_SET; 
 
	if ( pa_dir )   data->mode |= I8255_PA_IN; 
	if ( pb_dir )   data->mode |= I8255_PB_IN; 
	if ( cl_dir )   data->mode |= I8255_CL_IN; 
	if ( ch_dir )   data->mode |= I8255_CH_IN; 
	chp_portwt ( I8255_CNTRL(data->base), data->mode ); 
	data->stat = I8255_ST_OK; 
	} 
 
/*- 
 *  ---------------------------------------------------------------------- 
 *  END I8255F02.C Source File 
 *  ---------------------------------------------------------------------- 
 */