Re: trying to find information on mvme5100 battery

[Dirk Zimoch via Tech-talk <tech-talk@aps.anl.gov>]

Hi Maren,

Attached find my driver for the M48T37 Timekeeper battery status. It 
works with any EPICS version on MVME51xx as well as on MVME23xx, maybe 
on more boards using this chip.
I have some more code to read and set the RTC and use the alarm function 
of the M48T37 in case you need it.
The code is vxWorks only.

Be aware that the M48T37 reads the battery status only once at power-on. 
So there is no point in processing the record more often than PINI=YES.
Dirk


On 09.02.19 02:06, Maren Purves wrote:
> Happy to, thanks Dirk!
>
> On 2/8/19 05:35, Dirk Zimoch via Tech-talk wrote:
> > I am just now writing a driver for it. Wait a few days please...
> >
> > On 08.02.19 03:01, Maren Purves via Tech-talk wrote:
> > > Hi all,
> > >
> > > I'm working on some monitoring stuff for a new receiver
> > > and as the new receiver isn't here yet I just got a spare
> > > mvme5100 board. Trying to boot it I found that it had
> > > 'forgotten' its boot parameters. It is supposed to have
> > > a replaceable battery and we found on part that looks like
> > > it may be a battery but with no part number or anything on
> > > it.
> > > None of the manuals I found on-line has a board layout
> > > with labels on it that would tell me where the battery
> > > is (assuming that the battery is the problem), or had
> > > any specifications for it.
> > > Pulling out another spare board, it behaved the same way.
> > > If we have to put any of these spare boards into use that
> > > would mean that they would have to have their boot parameters
> > > reinstalled each time we have a power glitch. That's OK
> > > for us here in the office/lab but not OK for people
> > > operating telescopes at night.
> > >
> > > Does anybody know and can either point me somewhere where
> > > to find this information - or have the information and
> > > pass it on?
> > >
> > > Thanks in advance,
> > > Maren Purves
> > > East Asian Observatory
#include <vxWorks.h>
#include "epicsVersion.h"
#include "devSup.h"
#include "biRecord.h"

#define M48T_FLAGS    0x7ff0
#define M48T_FLAG_BAT   0x10

extern UCHAR sysNvRead(ULONG);

long MT48T37ReadBatteryLow(biRecord *rec)
{
    rec->rval = sysNvRead(M48T_FLAGS) & M48T_FLAG_BAT ? 1 : 0;
    return 0;
}

struct {
    long        number;
    DEVSUPFUN   report;
    DEVSUPFUN   init;
    DEVSUPFUN   init_record;
    DEVSUPFUN   get_ioint_info;
    DEVSUPFUN   read;
} MT48T37BatteryLow = {
    5,
    NULL,
    NULL,
    NULL,
    NULL,
    MT48T37ReadBatteryLow
};

#ifndef BASE_VERSION
#include "epicsExport.h"
epicsExportAddress(dset, MT48T37BatteryLow);
#endif

device(bi,         INST_IO, MT48T37BatteryLow,  "MT48T37BatteryLow")

record (bi, "$(IOC):BATTERY")
{
    field(DTYP, "MT48T37BatteryLow")
    field(PINI, "YES") # battery status uptates at power-on only
    field(ZNAM, "OK")
    field(ONAM, "LOW")
    field(OSV,  "MINOR")
}