That is great sleuthing! We have a "retry" in the serial initiation code
anyways, I'll add the power cycling to it.
On Sun, Jan 13, 2013 at 4:09 PM, Thorsten von Eicken <[email protected]>wrote:
> After a lot of troubleshooting, I finally figured out the problem. It
> seems that The Link doesn't reset properly and I have to drop DTR&RTS to
> cut its power and effect a full reset. Minicom does this, and that's why
> using that worked, except when I'd exit minicom it spews its modem reset
> which locked-up the Link agai, so I had to exit without modem reset
> (ctrl-a q).
> When I power up the board, I can see that it has RTS&DTR powered (+5v).
> Then I run the following little hacked-up program:
>
> #include <sys/termios.h>
> main(int argc, char**argv) {
> if (argc != 2) {
> exit(1);
> }
> printf("Dropping RTS&DTS on %s\n", argv[1]);
> int fd = open(argv[1], 3);
> struct termios tio1, tio2;
> tcgetattr(fd, &tio1);
> cfsetospeed(&tio1, B0);
> cfsetispeed(&tio1, B0);
> tcsetattr(fd, TCSAFLUSH, &tio1);
> }
>
> The sleep for a second or two and run owhttpd and it's all great. An
> alternative was to add the equivalent functionality into ow_serial_open.c
> with a static flag so it would only do this once and with a little sleep
> added. But that's very hacky. I would recommend adding a "drop DTR&RTS"
> routine into the failure handling, i.e., if the adapter doesn't open &
> reset
> at the first attempt, then drop the power for 1-2 seconds before trying
> again.
>
> In terms of troubleshooting, what tipped me off is that I was looking at a
> small
> rs-232 tester with LEDs showing activity, and I'd see something sent from
> the
> host to the Link but nothing coming back. This is a sign that the Link is
> in
> some state where what it's being sent doesn't make sense to it...
>
> Hope this helps someone...
> Thorsten
>
>
>
>
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