www.pudn.com > 8255_code_lib.rar > DIOFNC05.C

/*- 
 *  ---------------------------------------------------------------------- 
 *  File        :   DIOFNC05.C 
 *  Creator     :   Blake Miller 
 *  Version     :   01.01.00        February 1991 
 *  Language    :   Microsoft C     Version 5.1 
 *  Purpose     :   Intel 8255 Compatible Digital IO Functions 
 *                  8255 Byte Put Function 
 *  ---------------------------------------------------------------------- 
 *  Revision History: 
 *  022891 BVM  :   Change int to short. 
 *  070490 BVM  :   Creation 
 *  ---------------------------------------------------------------------- 
 */ 
 
#define     DIOFNC05_C_DEFINED  1 
#include    "DIOLIB.H" 
#undef      DIOFNC05_C_DEFINED 
 
void dio_put_byte (DIODAT *data, short port, unsigned char p_dat); 
 
/*- DIO : Byte Put ---------------------------** 
 *  Write one of the bytes in the 8255. 
 *  The port number should be 0 - 2 as follows: 
 *  Use the defines (DIOLIB.H): 
 *  DIO_PORTA = 0 = Port A 
 *  DIO_PORTB = 1 = Port B 
 *  DIO_PORTC = 2 = Port C 
 *  Passed: 
 *      pointer         :   DIODAT 
 *      short           :   port number 
 *      unsigned char   :   port data 
 *  Returns: 
 *      nothing 
 *      Loads stat with any error ID. 
 */ 
void dio_put_byte (DIODAT *data, short port, unsigned char p_dat) 
	{ 
	/*  Make sure the port requested is valid. 
	 *  Three ports. 
	 *  The port number should already have zero offset. 
	 *  Valid port port number = ( 0 - 2 ) 
	 */ 
	if ( (port < DIO_PORTA) || (port > DIO_PORTC) ){ 
		data->stat = DIO_ST_BP; 
		return; 
		} 
 
	data->pdat[port] = p_dat; 
	dio_bput ( data->base + port, p_dat ); 
	data->stat = DIO_ST_OK; 
	} 
 
/*- 
 *  ---------------------------------------------------------------------- 
 *  END DIOFNC05.C Source File 
 *  ---------------------------------------------------------------------- 
 */