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QMX real RTC #qmx

 

Hello OGs, YLs,
Question, actually it could be a feature request.. The stm32 chip has an internal real time clock. Wouldn't it be nice to make usable? Currently the clock may be shown on the display ant it starts counting - starting from zero on power-on. Two things would be needed:
?- software - a settigs menu where the user would be able to set current time without a need of playing with gps
?- hardware... the diagram shows that cpu's vbat leg is connected right to the gnd... adding small battery there would be required to persist the time on power off. And since stm32's rtc draws some microAmps, some small button battery should suffice.
What do you think?
GIUSEPPE
 

Hi Pawel, it would be nice and useful to be able to have a watch independent of the QLG2 GPS and be able to manage it directly as we like directly from the QMX to always have the time at hand during QSOs, but the frequency calibration always remains which without GPS can happen, for those who use the qmx in wspr it would be mandatory / essential to have it.? 73 iu8eun

Giuseppe iu8eun

Il Gio 25 Gen 2024, 08:04 <sp9paz@...> ha scritto:
Hello OGs, YLs,
Question, actually it could be a feature request.. The stm32 chip has an internal real time clock. Wouldn't it be nice to make usable? Currently the clock may be shown on the display ant it starts counting - starting from zero on power-on. Two things would be needed:
?- software - a settigs menu where the user would be able to set current time without a need of playing with gps
?- hardware... the diagram shows that cpu's vbat leg is connected right to the gnd... adding small battery there would be required to persist the time on power off. And since stm32's rtc draws some microAmps, some small button battery should suffice.
What do you think?

 

Hi Pawel,

Am 25.01.24 um 08:04 schrieb sp9paz@...:
Question, actually it could be a feature request. The stm32 chip has an internal real time clock. Wouldn't it be nice to make usable? Currently the clock may be shown on the display ant it starts counting - starting from zero on power-on. Two things would be needed:
?- software - a settigs menu where the user would be able to set current time without a need of playing with gps
?- hardware... the diagram shows that cpu's vbat leg is connected right to the gnd... adding small battery there would be required to persist the time on power off.
I think that is a great idea. Especially as the extnal GPS requires independ power to work, this is making the whole rig some more complex. But the adding of a small buffer battery and the software mod should not be such a big deal ... I hope.

I'd be definitely keen on doing this mod to my QDX.

Vy73,

Stefan.

--

Stefan U. Hegner <db4st@...>
* * *
DB4ST --- German Ham Radio Station
D-32584 L?hne ----- Locator JO42IE
* * *
GPG-Key | C3CC 23A4 FBA8 622B 48AE
F-Print | 4F19 D0EE E39E ABDC 2BCE
 

For a RTC in QMX the following?would?be needed:
  • Software change to allow setting real time clock - easy, and needs to be done anyway?
  • Software change to enable the RTC feature of the STM32 - easy enough
  • Addition of 32.768kHz crystal - NOT going to be easy to retrofit to existing QMX boards
  • Addition of coin cell battery wired to the VBAT pin - NOT easy either because the existing?VBAT pin connection has to be re-routed... and where would the coin cell fit inside the QMX??
73 Hans G0UPL



On Thu, Jan 25, 2024 at 10:04?AM <sp9paz@...> wrote:
Hello OGs, YLs,
Question, actually it could be a feature request.. The stm32 chip has an internal real time clock. Wouldn't it be nice to make usable? Currently the clock may be shown on the display ant it starts counting - starting from zero on power-on. Two things would be needed:
?- software - a settigs menu where the user would be able to set current time without a need of playing with gps
?- hardware... the diagram shows that cpu's vbat leg is connected right to the gnd... adding small battery there would be required to persist the time on power off. And since stm32's rtc draws some microAmps, some small button battery should suffice.
What do you think?

 

That pretty much closes the case :/ thanks, @Hans anyway.
BTW is there a way to make it keep the time when powered off but with power supply kept attached??
 

There isn't any way to maintain the current real time clock when powered down as it is run in the main processor code. Not the low current RTC peripheral. There would be potential ways to do a partial switch-off which reduces power consumption for example by switching off the 5V rail, USB and other functions and reducing CPU clock speed.

73 Hans G0UPL


On Mon, Jan 29, 2024, 11:15?PM sp9paz <pawel.zielinsky@...> wrote:
That pretty much closes the case :/ thanks, @Hans anyway.
BTW is there a way to make it keep the time when powered off but with power supply kept attached??

 

It sounds like the Terminator movie :)
 

?
:-) WOlfgang OE3WHU
?
p.s. the cr2016 will be replaced by a LIR1025 and a little charging network.
If there is some spare time at any time? (hihi) ... i guess the STM32 can be configured to support charging of the RTC Batt .. but i know this is far at the end of the list :-)
?
p.p.s? you delivered a master piece with the QMX
?
 

Actually I thought I read that the QMX+ already used the stm32 RTC output ?
 

On 06/04/2025 06:23, Rick Hill via groups.io wrote:
Actually I thought I read that the QMX+ already used the stm32 RTC output ?
Rick,

Wolfgang was showing us his QMX, no + :-)

Perhaps left for those with good soldering skills and steady hands.

73 Alan G4ZFQ
 

On Sat, Apr 5, 2025 at 09:59 PM, <whweb@...> wrote:
?
:-) WOlfgang OE3WHU
?
Wow, I'm impressed!
:)
?

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