[mythtv-users] Is anybody able to change channels on a 4250HDC STB via firewire?

Matt Emmott memmott at gmail.com
Tue Jun 23 23:59:34 UTC 2009

On Thu, Jun 4, 2009 at 8:36 PM, Christian Szpilfogel <chrisznews4 at rogers.com
> wrote:

> You are going to have to debug this lower down. I haven't seen these vendor
> IDs on an SA4250 (not necessarily an issue) and the Model ID of 0 is unusual
> to me as well. Your thread however indicates you compiled those values into
> the channel changer.
> In an earlier email you found:
> /sa4250_ch -v
> node 0: vendor_id = 0x00001106 model_id = 0x00000000
> node 1: vendor_id = 0x000022ce model_id = 0x000010cc
> 22ce IS a Scientific Atlanta box and 10cc is a model as well. Have you
> tried this pair? Your thread suggests you did not.
> I also asked you earlier for an output of plugreport and you did not do
> this. Can you do this?
> sa4250_ch_new also has a "-n" parameter so if you have the constants
> correct then perhaps you want the following command:
> sa4250_ch_new -n 1 -v 56

Ok, one more update and please understand I have no idea what I'm doing:

I modified sa4250_ch_new.c and set up that section as follows:

#define SA4200HD_VENDOR_ID1     0x000014f8
#define SA4200HD_MODEL_ID1      0x00001072
#define SA4250HD_VENDOR_ID1     0x000022ce  /* jerkychew's stb */
#define SA4250HD_MODEL_ID1      0x000010cc  /* jerkychew's stb */

I then compiled it using sudo gcc -o sa4250_ch_new sa4250_ch_new.c -lrom1394
-lavc1394 -lraw1394 and moved it to /usr/local/bin

I cd'ed to that directory and ran the following, with the following result:

matt at mythdev:/usr/local/bin$ ./sa4250_ch_new -n 1 785
Changing channel 785
matt at mythdev:/usr/local/bin$ ./sa4250_ch_new -v -n 1 785
node 1: vendor_id = 0x000022ce model_id = 0x000010cc
Device acquired on node 1
Changing channel 785
AV/C Command: cmd0=0x00487ce7 cmd1=0x04031100 cmd2=0xff000000

But it still never changes. Still out of ideas. I downloaded Scott
Bickford's script and will try to compile that.
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