2 * Copyright © 2008 Keith Packard <keithp@keithp.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 cccp_write(struct ccdbg *dbg, uint8_t mask, uint8_t value)
27 set = (mask) | (value << 8);
28 dbg->debug_data = (dbg->debug_data & ~mask) | (value & mask);
29 printf (" -> %02x\n", dbg->debug_data);
30 ret = ioctl(dbg->fd, CP2101_IOCTL_GPIOSET, &set);
32 perror("CP2101_IOCTL_GPIOSET");
36 cccp_read(struct ccdbg *dbg, uint8_t mask)
42 /* tri-state the bits of interest */
43 pull_up = (~dbg->debug_data) & mask;
45 cccp_write(dbg, pull_up, pull_up);
47 ret = ioctl(dbg->fd, CP2101_IOCTL_GPIOGET, &get);
49 perror("CP2101_IOCTL_GPIOGET");
52 printf (" <- %02x\n", get);
57 cccp_init(struct ccdbg *dbg)
59 /* set all of the GPIOs to a known state */
60 cccp_write(dbg, 0xf, 0xf);
65 cccp_fini(struct ccdbg *dbg)
67 /* set all of the GPIOs to a known state */
68 cccp_write(dbg, 0xf, 0xf);