1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
/*
* 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"
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");
}
uint8_t
cccp_read(struct ccdbg *dbg, uint8_t mask)
{
uint8_t pull_up;
int ret;
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);
}
ret = ioctl(dbg->fd, CP2101_IOCTL_GPIOGET, &get);
if (ret < 0) {
perror("CP2101_IOCTL_GPIOGET");
get = 0;
}
return get & mask;
}
void
cccp_init(struct ccdbg *dbg)
{
/* set all of the GPIOs to a known state */
cccp_write(dbg, 0xf, 0xf);
dbg->clock = 1;
}
void
cccp_fini(struct ccdbg *dbg)
{
/* set all of the GPIOs to a known state */
cccp_write(dbg, 0xf, 0xf);
dbg->clock = 1;
}
|
