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/*
* 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"
static void
get_bit(char *line, int i, char on, uint8_t bit, uint8_t *bits, uint8_t *masks)
{
if (line[i] == on) {
*bits |= bit;
*masks |= bit;
return;
}
if (line[i] == '.') {
*masks |= bit;
return;
}
if (line[i] == '-') {
return;
}
fprintf(stderr, "bad line %s\n", line);
exit (1);
}
static char
is_bit(uint8_t get, uint8_t mask, char on, uint8_t bit)
{
if (mask&bit) {
if (get&bit)
return on;
else
return '.';
} else
return '-';
}
static uint8_t
ccdbg_write_read(struct ccdbg *dbg, uint8_t set, uint8_t mask)
{
uint8_t get = set;
if (mask != (CC_DATA|CC_CLOCK|CC_RESET_N))
get = ccdbg_read(dbg);
ccdbg_write(dbg, mask, set);
printf ("%c %c %c",
is_bit(set, mask, 'C', CC_CLOCK),
is_bit(set, mask, 'D', CC_DATA),
is_bit(set, mask, 'R', CC_RESET_N));
if (mask != (CC_DATA|CC_CLOCK|CC_RESET_N))
printf(" -> %c %c %c",
is_bit(get, 0xf, 'C', CC_CLOCK),
is_bit(get, 0xf, 'D', CC_DATA),
is_bit(get, 0xf, 'R', CC_RESET_N));
printf("\n");
ccdbg_half_clock(dbg);
return get;
}
static void
_ccdbg_debug_mode(struct ccdbg *dbg)
{
printf ("#\n");
printf ("# Debug mode\n");
printf ("#\n");
ccdbg_write_read(dbg, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|CC_DATA|CC_RESET_N);
ccdbg_write_read(dbg, CC_DATA , CC_CLOCK|CC_DATA|CC_RESET_N);
ccdbg_write_read(dbg, CC_CLOCK|CC_DATA , CC_CLOCK|CC_DATA|CC_RESET_N);
ccdbg_write_read(dbg, CC_DATA , CC_CLOCK|CC_DATA|CC_RESET_N);
ccdbg_write_read(dbg, CC_CLOCK|CC_DATA , CC_CLOCK|CC_DATA|CC_RESET_N);
ccdbg_write_read(dbg, CC_DATA|CC_RESET_N, CC_CLOCK|CC_DATA|CC_RESET_N);
}
static void
_ccdbg_reset(struct ccdbg *dbg)
{
ccdbg_write_read(dbg, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|CC_DATA|CC_RESET_N);
ccdbg_write_read(dbg, CC_CLOCK|CC_DATA , CC_CLOCK|CC_DATA|CC_RESET_N);
ccdbg_write_read(dbg, CC_CLOCK|CC_DATA , CC_CLOCK|CC_DATA|CC_RESET_N);
ccdbg_write_read(dbg, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|CC_DATA|CC_RESET_N);
}
static void
_ccdbg_send_bit(struct ccdbg *dbg, uint8_t bit)
{
if (bit) bit = CC_DATA;
ccdbg_write_read(dbg, CC_CLOCK|bit|CC_RESET_N, CC_CLOCK|CC_DATA|CC_RESET_N);
ccdbg_write_read(dbg, bit|CC_RESET_N, CC_CLOCK|CC_DATA|CC_RESET_N);
}
static void
_ccdbg_send_byte(struct ccdbg *dbg, uint8_t byte)
{
int bit;
printf ("#\n");
printf ("# Send Byte 0x%02x\n", byte);
printf ("#\n");
for (bit = 7; bit >= 0; bit--) {
_ccdbg_send_bit(dbg, (byte >> bit) & 1);
if (bit == 3)
printf ("\n");
}
}
static void
_ccdbg_send_bits(struct ccdbg *dbg, int n, uint32_t bits)
{
int bit;
printf ("#\n");
printf ("# Send %d bits 0x%08x\n", n, bits);
printf ("#\n");
for (bit = n - 1; bit >= 0; bit--) {
_ccdbg_send_bit(dbg, (bits >> bit) & 1);
if ((bit & 3) == 3)
printf ("\n");
}
}
static void
_ccdbg_print_bits(int n, uint32_t bits)
{
int bit;
for (bit = n - 1; bit >= 0; bit--)
printf ("%d", (bits >> bit) & 1);
}
static uint32_t
_ccdbg_read_bits(struct ccdbg *dbg, int bits)
{
int bit;
uint32_t val = 0;
uint8_t get;
printf ("#\n");
printf ("# Read %d bits\n", bits);
printf ("#\n");
for (bit = 0; bit < bits; bit++) {
ccdbg_write_read(dbg, CC_CLOCK|CC_DATA|CC_RESET_N, CC_CLOCK|CC_RESET_N);
get = ccdbg_write_read(dbg, CC_DATA|CC_RESET_N, CC_CLOCK|CC_RESET_N);
val <<= 1;
if (get & CC_DATA)
val |= 1;
if ((bit & 3) == 3)
printf ("\n");
}
printf ("#\n");
printf ("# Read "); _ccdbg_print_bits(bits, val); printf ("\n");
printf ("#\n");
return val;
}
static int
_ccdbg_check_bits(uint32_t bits, uint8_t match)
{
int bit;
for (bit = 0; bit < 24; bit++)
if (((bits >> bit) & 0xff) == match)
return 1;
return 0;
}
static uint32_t
_ccdbg_play(struct ccdbg *dbg, int num_sync, uint32_t sync)
{
uint32_t bits;
_ccdbg_debug_mode(dbg);
_ccdbg_send_bits(dbg, num_sync, sync);
_ccdbg_send_byte(dbg, CC_GET_CHIP_ID);
bits = _ccdbg_read_bits(dbg, 16);
_ccdbg_send_byte(dbg, CC_GET_CHIP_ID);
bits = _ccdbg_read_bits(dbg, 16);
// _ccdbg_send_byte(dbg, CC_READ_STATUS);
_ccdbg_reset(dbg);
if (_ccdbg_check_bits(bits, 0x11)) {
printf("#\n#match with %d bits 0x%08x\n#\n", num_sync, sync);
return 1;
}
return 0;
}
static int
_ccdbg_play_num(struct ccdbg *dbg, int num)
{
uint32_t sync;
uint32_t max;
printf ("#\n#play %d\n#\n", num);
max = (1 << num);
for (sync = 0; sync < max; sync++)
if (_ccdbg_play(dbg, num, sync))
return 1;
return 0;
}
static int
_ccdbg_play_many(struct ccdbg *dbg, int max)
{
int num;
for (num = 0; num < max; num++)
if (_ccdbg_play_num(dbg, num))
return 1;
return 0;
}
static void
ccdbg_manual(struct ccdbg *dbg, FILE *input)
{
char line[80];
uint8_t set, mask;
while (fgets(line, sizeof line, input)) {
if (line[0] == '#' || line[0] == '\n') {
printf ("%s", line);
continue;
}
set = 0;
mask = 0;
get_bit(line, 0, 'C', CC_CLOCK, &set, &mask);
get_bit(line, 2, 'D', CC_DATA, &set, &mask);
get_bit(line, 4, 'R', CC_RESET_N, &set, &mask);
ccdbg_write_read(dbg, set, mask);
}
}
int
main (int argc, char **argv)
{
struct ccdbg *dbg;
uint8_t status;
uint16_t chip_id;
dbg = ccdbg_open("/dev/ttyUSB0");
if (!dbg)
exit (1);
#if 0
_ccdbg_play(dbg, 0, 0);
_ccdbg_play_many(dbg, 8);
#endif
ccdbg_manual(dbg, stdin);
#if 0
ccdbg_debug_mode(dbg);
status = ccdbg_read_status(dbg);
printf("Status: 0x%02x\n", status);
chip_id = ccdbg_get_chip_id(dbg);
printf("Chip id: 0x%04x\n", chip_id);
_ccdbg_reset(dbg);
#endif
ccdbg_close(dbg);
exit (0);
}
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