Re: msp430-gdbproxy loses connection with target

When I need to read a timer asynchronously do three consecutive reads and
do a bitwize majority function on them.


On Wed, Sep 18, 2013 at 11:08 PM, William Swanson <[email protected]>wrote:

> On Tue, Sep 17, 2013 at 9:09 PM, Andrew McLaren <[email protected]>
> wrote:
> > The logic maintains a reference timebase using the timer B module (this
> > simply ticks away in the background and maintains a reference counter).
> To
> > obtain a time reference at any time, the logic stops the timer block,
> reads
> > the TBR, and restarts the timer block. Nothing really fancy there.
>
> Why are you stopping the timer? I understand that the timer updates
> asynchronously, so the value may not be stable, but you can get around
> that by taking multiple readings until you see two that are the same:
>
> unsigned read_timer(void)
> {
>     unsigned base, sample;
>     sample = TB0R;
>     do {
>         base = sample;
>         sample = TB0R;
>     } while (base != sample);
>     return sample;
> }
>
> Given the device erratum, this approach would probably make more
> sense. It works as long as the clock is somewhat slower than your CPU
> clock (like 16x slower).
>
> -William
>
>
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