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 say(char *name, uint8_t bits)
25 if (bits & CC_RESET_N)
40 _cccp_write(struct ccdbg *dbg, uint8_t mask, uint8_t value)
45 set = (mask) | (value << 8);
46 dbg->debug_data = (dbg->debug_data & ~mask) | (value & mask);
47 ret = ioctl(dbg->fd, CP2101_IOCTL_GPIOSET, &set);
49 perror("CP2101_IOCTL_GPIOSET");
53 cccp_write(struct ccdbg *dbg, uint8_t mask, uint8_t value)
55 _cccp_write(dbg, mask, value);
56 // say("w", dbg->debug_data);
60 cccp_read_all(struct ccdbg *dbg)
64 ret = ioctl(dbg->fd, CP2101_IOCTL_GPIOGET, &get);
66 perror("CP2101_IOCTL_GPIOGET");
73 cccp_read(struct ccdbg *dbg, uint8_t mask)
78 /* tri-state the bits of interest */
79 pull_up = (~dbg->debug_data) & mask;
81 _cccp_write(dbg, pull_up, pull_up);
82 get = cccp_read_all(dbg);
88 cccp_init(struct ccdbg *dbg)
90 /* set all of the GPIOs to a known state */
91 cccp_write(dbg, 0xf, 0xf);
95 cccp_fini(struct ccdbg *dbg)
97 /* set all of the GPIOs to a known state */
98 cccp_write(dbg, 0xf, 0xf);
104 dbg->fd = open("/dev/ttyUSB0", 2);
111 cccp_write(dbg, CC_CLOCK, CC_CLOCK);