avrdude/ppi.c

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/*
* avrdude - A Downloader/Uploader for AVR device programmers
* Copyright (C) 2000, 2001, 2002, 2003 Brian S. Dean <bsd@bsdhome.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* $Id$ */
#if defined(__FreeBSD__) || defined(__linux__)
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#if defined(__FreeBSD__)
#include <dev/ppbus/ppi.h>
#elif defined(__linux__)
#include "linux_ppdev.h"
#endif
#include "avr.h"
#include "pindefs.h"
#include "pgm.h"
#include "ppi.h"
extern char * progname;
/*
* set 'get' and 'set' appropriately for subsequent passage to ioctl()
* to get/set the specified PPI registers.
*/
static int ppi_getops(int reg, unsigned long * get, unsigned long * set)
{
switch (reg) {
case PPIDATA:
*set = PPISDATA;
*get = PPIGDATA;
break;
case PPICTRL:
*set = PPISCTRL;
*get = PPIGCTRL;
break;
case PPISTATUS:
*set = PPISSTATUS;
*get = PPIGSTATUS;
break;
default:
fprintf(stderr, "%s: avr_set(): invalid register=%d\n",
progname, reg);
return -1;
break;
}
return 0;
}
/*
* set the indicated bit of the specified register.
*/
int ppi_set(int fd, int reg, int bit)
{
unsigned char v;
unsigned long get, set;
int rc;
rc = ppi_getops(reg, &get, &set);
if (rc)
return -1;
ioctl(fd, get, &v);
v |= bit;
ioctl(fd, set, &v);
return 0;
}
/*
* clear the indicated bit of the specified register.
*/
int ppi_clr(int fd, int reg, int bit)
{
unsigned char v;
unsigned long get, set;
int rc;
rc = ppi_getops(reg, &get, &set);
if (rc)
return -1;
ioctl(fd, get, &v);
v &= ~bit;
ioctl(fd, set, &v);
return 0;
}
/*
* get the indicated bit of the specified register.
*/
int ppi_get(int fd, int reg, int bit)
{
unsigned char v;
unsigned long get, set;
int rc;
rc = ppi_getops(reg, &get, &set);
if (rc)
return -1;
ioctl(fd, get, &v);
v &= bit;
return v; /* v == bit */
}
/*
* toggle the indicated bit of the specified register.
*/
int ppi_toggle(int fd, int reg, int bit)
{
unsigned char v;
unsigned long get, set;
int rc;
rc = ppi_getops(reg, &get, &set);
if (rc)
return -1;
ioctl(fd, get, &v);
v ^= bit;
ioctl(fd, set, &v);
return 0;
}
/*
* get all bits of the specified register.
*/
int ppi_getall(int fd, int reg)
{
unsigned char v;
unsigned long get, set;
int rc;
rc = ppi_getops(reg, &get, &set);
if (rc)
return -1;
ioctl(fd, get, &v);
return (int)v;
}
/*
* set all bits of the specified register to val.
*/
int ppi_setall(int fd, int reg, int val)
{
unsigned char v;
unsigned long get, set;
int rc;
rc = ppi_getops(reg, &get, &set);
if (rc)
return -1;
v = val;
ioctl(fd, set, &v);
return 0;
}
int ppi_open(char * port)
{
int fd;
fd = open(port, O_RDWR);
if (fd < 0) {
fprintf(stderr, "%s: can't open device \"%s\": %s\n",
progname, port, strerror(errno));
return -1;
}
return fd;
}
void ppi_close(int fd)
{
close(fd);
}
#endif