2010/8/23 Frans Meulenbroeks <[email protected]>:
> while browsing through the code I stumbled upon clock
>
> src/tap/cable/generic.c says:
>
> int
> urj_tap_cable_generic_transfer (urj_cable_t *cable, int len, const char *in,
>                                char *out)
> {
>    int i;
>
>    if (out)
>        for (i = 0; i < len; i++)
>        {
>            out[i] = cable->driver->get_tdo (cable);
>            cable->driver->clock (cable, 0, in[i], 1);
>        }
>    else
>        for (i = 0; i < len; i++)
>        {
>            cable->driver->clock (cable, 0, in[i], 1);
>        }
>
>    return i;
> }
>
> In the else case wouldn't it be better to say instead of the for loop:
>    cable->driver->clock (cable, 0, in[i], len);
> This somehow reduces the overhead.

Nevermind, peeked into this again. Misunderstood the code. sorry.
>
> Also is it guaranteed/defined that the tdi and tms argumetns to clock
> are 0 or 1? Or can there also be other values.
> If they are guaranteed 0 or 1 we can eliminate the followigng lines
> from the gpio.c gpio_clock function
>    tms = tms ? 1 : 0;
>    tdi = tdi ? 1 : 0;

This question still remains open.

Frans

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