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/*
* Copyright © 2008 Keith Packard <keithp@keithp.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.
*/
#include "ccdbg.h"
static void
say(char *name, uint8_t bits)
{
printf("%s: ", name);
if (bits & CC_RESET_N)
printf ("R ");
else
printf (". ");
if (bits & CC_CLOCK)
printf ("C ");
else
printf (". ");
if (bits & CC_DATA)
printf ("D\n");
else
printf (".\n");
}
static void
_cccp_write(struct ccdbg *dbg, uint8_t mask, uint8_t value)
{
uint16_t set;
int ret;
set = (mask) | (value << 8);
dbg->debug_data = (dbg->debug_data & ~mask) | (value & mask);
ret = ioctl(dbg->fd, CP2101_IOCTL_GPIOSET, &set);
if (ret < 0)
perror("CP2101_IOCTL_GPIOSET");
}
void
cccp_write(struct ccdbg *dbg, uint8_t mask, uint8_t value)
{
_cccp_write(dbg, mask, value);
// say("w", dbg->debug_data);
}
uint8_t
cccp_read_all(struct ccdbg *dbg)
{
int ret;
uint8_t get;
ret = ioctl(dbg->fd, CP2101_IOCTL_GPIOGET, &get);
if (ret < 0) {
perror("CP2101_IOCTL_GPIOGET");
get = 0;
}
return get;
}
uint8_t
cccp_read(struct ccdbg *dbg, uint8_t mask)
{
uint8_t pull_up;
uint8_t get;
/* tri-state the bits of interest */
pull_up = (~dbg->debug_data) & mask;
if (pull_up)
_cccp_write(dbg, pull_up, pull_up);
get = cccp_read_all(dbg);
say("\t\tr", get);
return get & mask;
}
void
cccp_init(struct ccdbg *dbg)
{
/* set all of the GPIOs to a known state */
cccp_write(dbg, 0xf, 0xf);
}
void
cccp_fini(struct ccdbg *dbg)
{
/* set all of the GPIOs to a known state */
cccp_write(dbg, 0xf, 0xf);
dbg->clock = 1;
}
cccp_open()
{
dbg->fd = open("/dev/ttyUSB0", 2);
if (dbg->fd < 0) {
perror(file);
free(dbg);
return NULL;
}
cccp_init(dbg);
cccp_write(dbg, CC_CLOCK, CC_CLOCK);
}
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