Paul Alfille-2 wrote:
>
> That's a long pause -- even a reset should only be ~500 usec.
>
> In fact you've given a great hint to the solution. There must be a
> discharge-all-lines command being sent.
>
No, it wasn't a discharge-all-lines command. It is a bug in
BUS_select_subbranch.
In the DS2409 doc. it says that a SMART-ON MAIN command should follow 16
time slots, 8time slots (reset stimuli) generated by the bus master. See the
flowchart in the doc.
I have changed the function to (added write of 0xff, and read one byte
less):
static int BUS_select_subbranch(const struct buspath *bp,
const struct
parsedname *pn)
{
BYTE sent[11] = { _1W_MATCH_ROM, };
BYTE branch[2] = { _1W_SMART_ON_MAIN, _1W_SMART_ON_AUX, }; /* Main, Aux
*/
BYTE resp[2];
struct transaction_log t[] = {
TRXN_WRITE(sent,11),
TRXN_READ2(resp),
TRXN_END,
};
memcpy(&sent[1], bp->sn, 8);
sent[9] = branch[bp->branch];
sent[10] = 0xff;
LEVEL_DEBUG("Selecting subbranch " SNformat "\n", SNvar(bp->sn)) ;
if (BUS_transaction_nolock(t, pn) || (resp[1] != branch[bp->branch])) {
STAT_ADD1_BUS(e_bus_select_errors,pn->selected_connection) ;
LEVEL_CONNECT("Select subbranch error for %s on bus
%s\n",pn->selected_device->readable_name,pn->selected_connection->name);
return 1;
}
//printf("subbranch stop\n");
return 0;
}
and now it works.
/Dag
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