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Digital Input/Output Control

Appendix B

Embedded and Industrial Computing

#include <sys/malloc.h>

#include <sys/kernel.h>

#include <sys/bus.h>

#include <sys/errno.h>

#include <machine/bus.h>

#include <machine/resource.h>

#endif

/* local include file */

#include “../include/ioaccess.h”

#if (defined(MODULE) || defined(DIRECT_IO_ACCESS) ||

defined(KLD_MODULE))

*---------------------------------------------------------------------------

---

* LEB-7105 Version V1.0

* The IO interface for Digital DIO is connected to Winbond

SIO 83627.

* Platform provide 4 digital input and 4 digital output.

* GPIO24-27 as input function, GPIO60-63 as output

function

* Refer to Winbond 83627 datasheet for details.

* The truth table is defined as below:

* DIO GPIO pins as follows:

* IN OUT

* DIO GP24 GP60

* DIO GP25 GP61

* DIO GP26 GP62

* DIO GP27 GP63

*---------------------------------------------------------------------------

--------

* Device Depend Definition : Winbond 83627 SIO

#define INDEX_PORT 0x2E

#define DATA_PORT 0x2F

#define GPIO2X 2

#define GPIO24_BIT (1 << 4)

#define GPIO25_BIT (1 << 5)

#define GPIO26_BIT (1 << 6)

#define GPIO27_BIT (1 << 7)

#define GPIO_GPIO24_GPIO27_MASK (GPIO24_BIT |

GPIO25_BIT | GPIO26_BIT | GPIO27_BIT)

#define GPIO6X 4

#define GPIO60_BIT (1 << 0)

#define GPIO61_BIT (1 << 1)

#define GPIO62_BIT (1 << 2)

#define GPIO63_BIT (1 << 3)

#define GPIO_GPIO60_GPIO63_MASK (GPIO60_BIT |

GPIO61_BIT | GPIO62_BIT | GPIO63_BIT)

void enter_w83627_config(void)

{

outportb(INDEX_PORT, 0x87); // Must Do It Twice

outportb(INDEX_PORT, 0x87);

return;

}

void exit_w83627_config(void)

{

outportb(INDEX_PORT, 0xAA);

return;

}

unsigned char read_w83627_reg(int LDN, int reg)

{

unsigned char tmp = 0;

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