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 ccdbg_quarter_clock(struct ccdbg *dbg)
24 usleep(CC_CLOCK_US / 4);
28 ccdbg_half_clock(struct ccdbg *dbg)
30 usleep(CC_CLOCK_US / 2);
34 ccdbg_open(char *file)
38 dbg = calloc(sizeof (struct ccdbg), 1);
45 dbg->fd = open(file, 2);
52 cccp_write(dbg, CC_CLOCK, CC_CLOCK);
61 ccdbg_close(struct ccdbg *dbg)
73 ccdbg_write(struct ccdbg *dbg, uint8_t mask, uint8_t value)
76 return cccp_write(dbg, mask, value);
78 cp_usb_write(dbg, mask, value);
84 ccdbg_read(struct ccdbg *dbg)
87 return cccp_read_all(dbg);
89 return cp_usb_read(dbg);
94 ccdbg_clock_1_0(struct ccdbg *dbg)
96 ccdbg_quarter_clock(dbg);
97 assert(dbg->clock == 1);
98 ccdbg_write(dbg, CC_CLOCK, 0);
100 ccdbg_quarter_clock(dbg);
104 ccdbg_clock_0_1(struct ccdbg *dbg)
106 ccdbg_quarter_clock(dbg);
107 assert(dbg->clock == 0);
108 ccdbg_write(dbg, CC_CLOCK, CC_CLOCK);
110 ccdbg_quarter_clock(dbg);
114 * By convention, every macro function is entered with dbg->clock == 1
118 ccdbg_write_bit(struct ccdbg *dbg, uint8_t bit)
122 assert(dbg->clock == 1);
126 ccdbg_half_clock(dbg);
127 ccdbg_write(dbg, CC_DATA|CC_CLOCK, data);
128 ccdbg_half_clock(dbg);
129 ccdbg_write(dbg, CC_CLOCK, 0);
130 // printf ("%d", bit);
134 ccdbg_write_byte(struct ccdbg *dbg, uint8_t byte)
138 for (bit = 7; bit >= 0; bit--)
139 ccdbg_write_bit(dbg, (byte >> bit) & 1);
143 ccdbg_read_bit(struct ccdbg *dbg)
147 ccdbg_half_clock(dbg);
148 ccdbg_write(dbg, CC_CLOCK, CC_CLOCK);
149 ccdbg_half_clock(dbg);
150 ccdbg_write(dbg, CC_CLOCK, 0);
151 data = ccdbg_read(dbg);
152 return (data & CC_DATA) ? 1 : 0;
156 ccdbg_read_byte(struct ccdbg *dbg)
161 for (bit = 7; bit >= 0; bit--)
162 byte |= ccdbg_read_bit(dbg) << bit;
167 ccdbg_cmd_write(struct ccdbg *dbg, uint8_t cmd, uint8_t *data, int len)
170 ccdbg_write_byte(dbg, cmd);
171 for (i = 0; i < len; i++)
172 ccdbg_write_byte(dbg, data[i]);
176 ccdbg_cmd_write_read8(struct ccdbg *dbg, uint8_t cmd, uint8_t *data, int len)
179 ccdbg_cmd_write(dbg, cmd, data, len);
180 ret = ccdbg_read_byte(dbg);
185 ccdbg_cmd_write_read16(struct ccdbg *dbg, uint8_t cmd, uint8_t *data, int len)
187 uint8_t byte1, byte0;
189 ccdbg_cmd_write(dbg, cmd, data, len);
190 byte1 = ccdbg_read_byte(dbg);
191 byte0 = ccdbg_read_byte(dbg);
192 for (i = 0; i < 4; i++)
193 (void) ccdbg_read_byte(dbg);
194 return (byte1 << 8) | byte0;