[mythtv] Motorola DCT channel changes...
Jim Westfall
jwestfall at surrealistic.net
Wed Feb 1 06:09:01 UTC 2006
thats actually how it used to be.
http://www.gossamer-threads.com/lists/mythtv/dev/79627?#79627
http://www.gossamer-threads.com/lists/mythtv/dev/106352?#106352
jim
Tim Trampedach <tim.trampedach at gmail.com> wrote [02.01.06]:
> I found out a few interesting things on this and came up with a revamped
> version of the 6200ch utility. Take a look at this web page:
> http://mac_hdtv_timer.home.comcast.net/channel.html. It uses a 72-bit string
> to send the command to the device in a single shot. MythTV and the utility
> currently use three separate transactions with 32-bit commands to send
> digits one at a time. After some digging in the code I noticed that the
> Scientific Atlanta box also uses 72-bit string, except it needs it twice (a
> "change" and then a "commit" if you will). So I revamped the 6200ch utility
> to use the string format from that web page and it works flawlessly for me
> now. No waiting with sleep, no missed channel changes and it's much quicker
> than one digit at a time.
>
> It really works well, but your mileage may vary. Therefore, if you have a
> 6200-series box, please compile code below and let me know how it goes. One
> or two minor items of cleanup could happen in there, but I'm on my way to
> sleep. Tomorrow! :-)
>
> The actual change is quite simple as it actually makes the code less
> complicated. I need some feedback on this before I'll open a ticket and
> submit the patch.
>
> Thanks,
>
> Tim
>
>
> /*
> * 6200ch - an external channel changer for Motorola DCT-6200 Tuner
> *
> * Copyright 2004,2005 by Stacey D. Son <mythdev at son.org>
> *
> * 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 <libavc1394/rom1394.h>
> #include <libavc1394/avc1394.h>
> #include <libraw1394/raw1394.h>
> #include <sys/types.h>
> #include <stdio.h>
> #include <errno.h>
> #include <stdlib.h>
> #include <unistd.h> // for usleep
>
> // Motorola DCT-6200 IDs
> // Note: there are at least three different vendor IDs for the 6200
> #define DCT6200_VENDOR_ID1 0x00000ce5
> #define DCT6200_VENDOR_ID2 0x00000e5c
> #define DCT6200_VENDOR_ID3 0x00001225
> #define DCT6200_VENDOR_ID4 0x00000f9f
> #define DCT6200_VENDOR_ID5 0x00001180
> #define DCT6200_VENDOR_ID6 0x000012c9
> #define DCT6200_VENDOR_ID7 0x000011ae
> #define DCT6200_VENDOR_ID8 0x0000152f
> #define DCT6200_VENDOR_ID9 0x000014e8
> #define DCT6200_SPEC_ID 0x00005068
> #define DCT6200_SW_VERSION 0x00010101
> #define DCT6200_MODEL_ID1 0x0000620a
> #define DCT6200_MODEL_ID2 0x00006200
> #define DCT6412_VENDOR_ID1 0x00000f9f
> #define DCT6412_MODEL_ID1 0x000064ca
>
> #define AVC1394_SUBUNIT_TYPE_6200 (9 << 19) /* uses a reserved subunit type
> */
>
> #define AVC1394_6200_COMMAND_CHANNEL 0x000007C00 /* 6200 subunit command
> */
> #define AVC1394_6200_OPERAND_SET 0x20 /* 6200 subunit command operand
> */
>
> #define CTL_CMD0 AVC1394_CTYPE_CONTROL | AVC1394_SUBUNIT_TYPE_6200 | \
> AVC1394_SUBUNIT_ID_0 | AVC1394_6200_COMMAND_CHANNEL | \
> AVC1394_6200_OPERAND_SET
>
> #define STARTING_NODE 1 /* skip 1394 nodes to avoid error msgs */
>
> void usage()
> {
> fprintf(stderr, "Usage: 6200ch [-v] [-n NODE] <channel_num>\n");
> fprintf(stderr, "-v Print additional verbose output\n");
> fprintf(stderr, "-n NODE node to start device scanning on\n");
> exit(1);
> }
>
> int main (int argc, char *argv[])
> {
> rom1394_directory dir;
> int device = -1;
> int i;
> int verbose = 0;
> quadlet_t cmd[3];
> int dig[3];
> int chn = 550;
>
> /* some people experience crashes when starting on node 1 */
> int starting_node = STARTING_NODE;
> int c;
> int index;
>
> if (argc < 2)
> usage();
>
> opterr = 0;
> while ((c = getopt(argc, argv, "vn:")) != -1) {
> switch (c) {
> case 'v':
> verbose = 1;
> break;
> case 'n':
> starting_node = atoi(optarg);
> break;
> default:
> fprintf(stderr, "incorrect command line arguments\n");
> usage();
> }
> }
>
> /* print out usage message if not enough arguments */
> if (optind != argc-1) {
> usage();
> }
> /* the last argument is the channel number */
> chn = atoi(argv[optind]);
>
> #ifdef RAW1394_V_0_8
> raw1394handle_t handle = raw1394_get_handle();
> #else
> raw1394handle_t handle = raw1394_new_handle();
> #endif
>
> if (!handle) {
> if (!errno) {
> fprintf(stderr, "Not Compatable!\n");
> } else {
> perror("Couldn't get 1394 handle");
> fprintf(stderr, "Is ieee1394, driver, and raw1394 loaded?\n");
> }
> exit(1);
> }
>
> if (raw1394_set_port(handle, 0) < 0) {
> perror("couldn't set port");
> raw1394_destroy_handle(handle);
> exit(1);
> }
>
> if (verbose)
> printf("starting with node: %d\n", starting_node);
>
> int nc = raw1394_get_nodecount(handle);
> for (i=starting_node; i < nc; ++i) {
> if (rom1394_get_directory(handle, i, &dir) < 0) {
> fprintf(stderr,"error reading config rom directory for node %d\n",
> i);
> raw1394_destroy_handle(handle);
> exit(1);
> }
>
> if (verbose)
> printf("node %d: vendor_id = 0x%08x model_id = 0x%08x\n",
> i, dir.vendor_id, dir.model_id);
>
> if ( ((dir.vendor_id == DCT6200_VENDOR_ID1) ||
> (dir.vendor_id == DCT6200_VENDOR_ID2) ||
> (dir.vendor_id == DCT6200_VENDOR_ID3) ||
> (dir.vendor_id == DCT6200_VENDOR_ID4) ||
> (dir.vendor_id == DCT6200_VENDOR_ID5) ||
> (dir.vendor_id == DCT6200_VENDOR_ID6) ||
> (dir.vendor_id == DCT6200_VENDOR_ID7) ||
> (dir.vendor_id == DCT6200_VENDOR_ID8) ||
> (dir.vendor_id == DCT6200_VENDOR_ID9) ||
> (dir.vendor_id == DCT6412_VENDOR_ID1)) &&
> ((dir.model_id == DCT6200_MODEL_ID1) ||
> (dir.model_id == DCT6200_MODEL_ID2) ||
> (dir.model_id == DCT6412_MODEL_ID1)) ) {
> if (dir.unit_spec_id != DCT6200_SPEC_ID)
> fprintf(stderr, "Warning: Unit Spec ID different.\n");
> if (dir.unit_sw_version != DCT6200_SW_VERSION)
> fprintf(stderr, "Warning: Unit Software Version
> different.\n");
> device = i;
> break;
> }
> }
>
> if (device == -1) {
> fprintf(stderr, "Could not find Motorola DCT-6200 on the 1394
> bus.\n");
> raw1394_destroy_handle(handle);
> exit(1);
> }
>
> cmd[0] = CTL_CMD0 | 0x67;
> cmd[1] = (0x04 << 24) | (chn << 8) | 0x000000FF;
> cmd[2] = 0xFF << 24;
>
> if (verbose)
> printf("AV/C command for channel %d = 0x%08X %08X %08X\n",
> chn, cmd[0], cmd[1], cmd[2]);
>
> avc1394_transaction_block(handle, device, cmd, 3, 1);
>
> raw1394_destroy_handle(handle);
> exit(0);
> }
>
>
> On 1/31/06, Steven Adeff <adeffs.mythtv at gmail.com> wrote:
> >
> > I talked to a fellow that wrote windows software for interacting with the
> > Motorola DCT via firewire. I asked him what his method is for changing
> > channels to see if its any different than what 6200ch.c and mythtv are
> > doing, here's his response:
> >
> > "Sorry for the delay replying, I haven't done much with firewire are a
> > couple of months due to being busy at work. I did see similar issues, what
> > seemed to fix the problem was this
> > 1. I use a delay of 50ms between sending digits
> > 2. When I do the 50ms delay, I time the actual delay (using
> > QueryPerformanceCounter). If the actual delay taken is > 500ms, then I
> > resend all whole channel again.
> > 3. I also send each digit twice, once with the down button command and
> > once with the up button command. Each command has a 50ms delay delay
> > 4. I also send the enter button after sending the channel digits and dont
> > send leading zeros e.g. channel 10 would be 0x21, 0xa1, 0x20, 0xa0, 0x0d,
> > 0x8d as the values in the command"
> >
> > I'm going to see if I can modify 6200ch.c myself, but don't know how far
> > I'll make it. If any programmers here can help in anyway please chime in.
> >
> > thanks!
> >
> > --
> > Steve
> > _______________________________________________
> > mythtv-dev mailing list
> > mythtv-dev at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-dev
> >
> >
> >
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