piolib.h

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#include "daadioLib.h"
#include "semLib.h"

/**************************************************
		PUBLIC
**************************************************/

/* Number of PIO ports */
#define PIO_MAX_PORTS				6
/* Number of channels per port */
#define PIO_MAX_CHANNELS_PER_PORT	8

#define ON							1
#define OFF							0

#define PORT_A						0
#define PORT_B						1
#define PORT_C						2
#define PORT_D						3
#define PORT_E						4
#define PORT_F						5

/**************************************************
		PRIVATE
**************************************************/

/* offset of PIO registers */
#define PIO_OFFSET							0x20
/* offset of the Output Enable Register */
#define PIO_OUTPUT_ENABLE_OFFSET			0x27

/* To obtain a port register offset we need to add PIO_OFFSET plus 
   the port number with bit 0 inverted.  This is due to each even numbered
   port is at an address one higher than its odd brethern, i.e. Port A (0)
   is at offset 0x21 while Port B (1) is at 0x20. */

#define PIO_PORT_NUM_TO_OFF(port)	(PIO_OFFSET + (int)(((port) & ~1) + \
									(((port) & 1) ^ 1)))

typedef struct
	{
	SEM_ID	mutexSem;		/* this is used for the optional lab */
	BOOL	initialized;	/* TRUE if the PIO module has been initialized */
	} PIO;