Michael,
Thanks for the clarification. Unfortunatly, there are still a few
questions.
--- In "Michael Schmidt" <> wrote:
>
>
>
> > Hi List,
> >
> > I'm trying to understand the reply while querying the bat3 but there
> > are a few parts I don't understand. Looking at
> > ftp://ftp.embeddedarm.com/bat3/GettingStarted.txt I see the definition
> > of the struct bat3Info but there are a few field which I don't
> > understand.
> >
> > float supplyV; // supply voltage
> > float regV; // regulated supply voltage
> >
> > These return values like 39812(supplyV) and 26623 (regV) when running
> > from a powersource (24V). On batteries these values return 1023.
>
> These inputs are coming directly from an ADC. To get the ADC
output the
> supply voltage is multiplied by ~0.07, then divided by 3.3V, then
multiplied
> by 65536. This corresponds to approximately 700mV per unit, so 39812 *
> 700mV is around 28V. The regulated value is approximately 190mV per
unit,
> so 26623 * 190mV is right around 5V. The values are only
approximate due to
> part tolerances and lack of ADC calibration.
>
> When you are running on batteries these values aren't valid; use the
> "onbatt" bit to condition these values.
This makes perfectly sense to me. It would be nice if this could be
added to the documentation to. Just for people like me. :-)
>
> >
> > dword pwm1en:1, // set if PWM1 is enabled
> > pwm2en:1, // set if PWM2 is enabled
> > offset:1, // reserved
> > opamp:1, // must be enabled to read battery current
> > buck:1, // reserved
> > led:1, // set if the LED on the board is on
> > jp3:1, // set if JP3 on the board is on
> > onbatt:1, // set if running on batteries
> > softJP3:1,// set automatically if battery voltage drops too low
> > locked:1; // set if bat3 has locked onto the target charge
current
> >
> > What is PWM1 and PWM2 for? I suppose it's UPS related but that's the
> > only thing I know.
>
> The PWMs control charging; there are two of them in parallel, so
turning one
> or both on charges the batteries if power is available (more current
if both
> are turned on). Normally you don't have to worry about this because
the
> charging algorithm takes of this.
I was just wondering because you can force them while running bat3. I
knew they had something to do with the charging system.
>
> > softJP3 is supposed to be set when the power drops but it wasn't in my
> > testcase. The docs say there's more info while running 'bat3 --help'
> > but that isn't very clear either.
>
> softJP3 is for battery protection, and normally isn't s activated
until the
> battery voltage drops below a certain value. This is to prevent
> over-discharge. When softJP3 is active it has the same effect as if
JP3 was
> on; i.e. the batteries will no longer provide power. softJP3 is
> automatically cleared at the appropriate time, and it can also be reset
> manually with a jumper on the appropriate pins of the 'ISP' header.
Hm, I'll have to take a closer look. As far as I remember the test,
softJP3 stayed active.
>
> Which options are you looking for more information on?
>
Maybe I could try to explain what we planned to do. In normal
situation we want to keep the batteries up-to-date. When there's no
external power, we want to keep on working on batteries until the
power drops "to low". When the battery power is to low, we unmount
the SD card where we write our logging and go into some suspend state
until the power is back or the battery power is completely gone. When
the power 's back the system has to be restarted.
Corrently we have a few issues hanging:
* using the --shutdown option of bat3 the system goes down and only
comes back when pressing the reset
* softJP3 didn't changed but I'll have to take a closer look
* the --sleep option of bat3 only supports a time while we're looking
for a option like "--sleep until_power" :-)
We don't know if it's all possible but we're trying to get it in our
own version of bat3 which we will post back if everything works fine.
greetings,
wim.
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