8255a.h

来自「基于AT91RM9200的IO口扩展」· C头文件 代码 · 共 38 行

/* 8255a GPIO interface for Linux on Atmel AT91RM9200
 * Copyright (c) 2006 Ligang Wang
 * [e-mail]
 */
#ifndef _8255A_H_
#define _8255A_H_

#define DEV_BASE	0
#define DEV8255A0  DEV_BASE+0
#define DEV8255A1  DEV_BASE+1
#define DEV8255A2  DEV_BASE+2
#define DEV8255A3  DEV_BASE+3
#define DEV8255A4  DEV_BASE+4
#define DEV8255A5  DEV_BASE+5

#define PORT_A		0
#define PORT_B		1
#define PORT_C		2
#define PORT_CTL	3

#define CMD_GET_PORT_STATE	128
#define CMD_SET_PORT_STATE	129
#define CMD_SELECT_DEV_PORT	130
#define CMD_GET_CURRENT_DEV_PORT	131

#define PARM_INPUT	1
#define PARM_OUTPUT	0

/*
	arg[23:16] dev
	arg[15:8] port
	arg[7:0]	 io_mod
*/	
#define get_dev(b)		((b & 0x00ff0000) >> 16) 
#define get_port(b)		((b & 0x0000ff00) >> 8)
#define get_io_mod(b)	((b & 0x000000ff) >> 0)

#endif