piolib.h

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

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

#define PIO_MAX_CHANNELS		8
#define PIO_MAX_PORTS			6
#define PIO_CHANNELS_PER_PORT	8

#define ON						1
#define OFF						0

#define PIO_INPUT               READ
#define PIO_OUTPUT              WRITE

/* PIO port numbers */
#define PIO_PORT_A					0
#define PIO_PORT_B					1
#define PIO_PORT_C					2
#define PIO_PORT_D					3
#define PIO_PORT_E					4
#define PIO_PORT_F					5

/* PIO Output Port Mask */
#define PIO_PORT_A_ENABLE			0x1
#define PIO_PORT_B_ENABLE			0x2
#define PIO_PORT_C_ENABLE			0x4
#define PIO_PORT_D_ENABLE			0x8
#define PIO_PORT_E_ENABLE			0x10
#define PIO_PORT_F_ENABLE			0x20

/* Convenient macros for setting and testing */
#define PIO_ON(port, ch)		pioSet((port), (ch), 1)
#define PIO_OFF(port, ch)		pioSet((port), (ch), 0)

/* PIO modes used by input channels 
 *
 * There are 3 components: the type of access we have to the channel 
 * (polling or interrupts), an action to take when an event occurs
 * (give a semaphore or put data into a message queue), and a state
 * which define what an event is (when channel is on, when channel
 * is off or when channel changes state).
 */

/* input mode types */
#define PIO_TYPE_IGNORE				0x0
#define PIO_TYPE_POLL				0x1

/* input mode actions */
#define PIO_ACTION_RELEASE_SEM		0x0

/* input mode states */
#define PIO_STATE_OFF				0x0
#define PIO_STATE_ON				0x1

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

/* offsets of PIO ports from base */
#define PIO_PORT_A_OFFSET			0x21
#define PIO_PORT_B_OFFSET			0x20
#define PIO_PORT_C_OFFSET			0x23
#define PIO_PORT_D_OFFSET			0x22
#define PIO_PORT_E_OFFSET			0x25
#define PIO_PORT_F_OFFSET			0x24
#define PIO_OUTPUT_ENABLE_OFFSET	0x27


/* PIO poll task defines */
#define PIO_POLL_DELAY			2		/* in clock ticks */
#define PIO_POLL_PRIORITY		240

/* this could be changed to PIO_PORT_B if we don't want to bother
 * polling PORT A which could be interrupt driven.
 */
#define PIO_START_POLL_PORT		PIO_PORT_A

/* input channel mode structure */
typedef union 
	{
	SEM_ID syncSem;
	} PIO_MODE_ID;

typedef struct 
	{
	unsigned type	:1;	/* poll or interrupt */
	unsigned action	:1;	/* release semaphore or msg queue */
	unsigned state	:1;	/* when on or off */
	} PIO_INPUT_MODE;

typedef struct
	{
	PIO_INPUT_MODE mode;	/* what is an event & what to do with it */
	PIO_MODE_ID id;
	} PIO_CHANNEL;

/* per port structure */
typedef struct 
	{
	UINT8 *pPort;
	int mode;
	PIO_CHANNEL channel[PIO_CHANNELS_PER_PORT];
	} PIO_PORT;

/* PIO structure */
typedef struct
	{
	PIO_PORT port[PIO_MAX_PORTS];
	UINT8 *pOutputEnablePort;
	SEM_ID mutexSem;
	int pollTaskStarted;
	int initialized;
	} PIO;