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.
23 ccdbg_half_clock(struct ccdbg *dbg)
25 struct timespec req, rem;
26 req.tv_sec = (CC_CLOCK_US / 2) / 1000000;
27 req.tv_nsec = ((CC_CLOCK_US / 2) % 1000000) * 1000;
28 nanosleep(&req, &rem);
32 ccdbg_open(char *file)
36 dbg = calloc(sizeof (struct ccdbg), 1);
43 dbg->fd = open(file, 2);
50 cccp_write(dbg, CC_CLOCK, CC_CLOCK);
59 ccdbg_close(struct ccdbg *dbg)
71 ccdbg_write(struct ccdbg *dbg, uint8_t mask, uint8_t value)
74 return cccp_write(dbg, mask, value);
76 cp_usb_write(dbg, mask, value);
82 ccdbg_read(struct ccdbg *dbg)
85 return cccp_read_all(dbg);
87 return cp_usb_read(dbg);
92 is_bit(uint8_t get, uint8_t mask, char on, uint8_t bit)
103 ccdbg_print(char *format, uint8_t mask, uint8_t set)
105 ccdbg_debug (CC_DEBUG_BITBANG, format,
106 is_bit(set, mask, 'C', CC_CLOCK),
107 is_bit(set, mask, 'D', CC_DATA),
108 is_bit(set, mask, 'R', CC_RESET_N));
112 ccdbg_send(struct ccdbg *dbg, uint8_t mask, uint8_t set)
114 ccdbg_write(dbg, mask, set);
115 ccdbg_print("%c %c %c\n", mask, set);
116 ccdbg_half_clock(dbg);
120 ccdbg_send_bit(struct ccdbg *dbg, uint8_t bit)
122 if (bit) bit = CC_DATA;
123 ccdbg_send(dbg, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|bit|CC_RESET_N);
124 ccdbg_send(dbg, CC_CLOCK|CC_DATA|CC_RESET_N, bit|CC_RESET_N);
128 ccdbg_send_byte(struct ccdbg *dbg, uint8_t byte)
131 ccdbg_debug(CC_DEBUG_BITBANG, "#\n# Send Byte 0x%02x\n#\n", byte);
132 for (bit = 7; bit >= 0; bit--) {
133 ccdbg_send_bit(dbg, (byte >> bit) & 1);
135 ccdbg_debug(CC_DEBUG_BITBANG, "\n");
140 ccdbg_send_bytes(struct ccdbg *dbg, uint8_t *bytes, int nbytes)
143 ccdbg_send_byte(dbg, *bytes++);
147 ccdbg_recv_bit(struct ccdbg *dbg, int first)
149 uint8_t mask = first ? CC_DATA : 0;
152 ccdbg_send(dbg, CC_CLOCK|mask|CC_RESET_N, CC_CLOCK|CC_DATA|CC_RESET_N);
153 read = ccdbg_read(dbg);
154 ccdbg_send(dbg, CC_CLOCK| CC_RESET_N, CC_RESET_N);
155 return (read & CC_DATA) ? 1 : 0;
159 ccdbg_recv_byte(struct ccdbg *dbg, int first)
164 ccdbg_debug(CC_DEBUG_BITBANG, "#\n# Recv byte\n#\n");
165 for (bit = 0; bit < 8; bit++) {
167 byte |= ccdbg_recv_bit(dbg, first);
169 ccdbg_debug(CC_DEBUG_BITBANG, "\n");
172 ccdbg_debug(CC_DEBUG_BITBANG, "#\n# Recv 0x%02x\n#\n", byte);
177 ccdbg_recv_bytes(struct ccdbg *dbg, uint8_t *bytes, int nbytes)
181 *bytes++ = ccdbg_recv_byte(dbg, first);
187 ccdbg_cmd_write(struct ccdbg *dbg, uint8_t cmd, uint8_t *data, int len)
190 ccdbg_send_byte(dbg, cmd);
191 for (i = 0; i < len; i++)
192 ccdbg_send_byte(dbg, data[i]);
196 ccdbg_cmd_write_read8(struct ccdbg *dbg, uint8_t cmd, uint8_t *data, int len)
199 ccdbg_cmd_write(dbg, cmd, data, len);
200 ccdbg_recv_bytes(dbg, byte, 1);
205 ccdbg_cmd_write_read16(struct ccdbg *dbg, uint8_t cmd, uint8_t *data, int len)
208 ccdbg_cmd_write(dbg, cmd, data, len);
209 ccdbg_recv_bytes(dbg, byte, 2);
210 return (byte[0] << 8) | byte[1];