Sign in
Search basicx
Subscribe to basicx
basicx by Keywords
Accelerometer | ADC | ADXL | Adxl20 | AVR | BasicStamp | BX-35 | BX28 | BX35 | COM3 | Compiler | Downloader | EEPROM | Electromagnet | GetADC | GP2D1 | GPS | I2C | IDE | Keypad | LCD | LCD+ | MIDI | Motors | Multitasking | Netmedia | Networking | PCB | PID | PlaySound | PWM | Relays | RTC | Servo | ShiftOut | SitePlayer | SPI | Stack | Timer | USB
Ads
Discussion Groups
Discussion Groups | BasicX | Re: RTC on the BX-24P
Discussion forum for the BasicX family of microcontroller chips.
RTC on the BX-24P - Bookwalter, Dan - Jan 20 9:41:00 2006
Does the real time clock on the latest version of the BX-24 still have
1.95 ms resolution ??? I really need it to be faster....
Dan Bookwalter N8DCJ FOC 1707
Hi-Stat a Stoneridge Co.
345 South Mill St.
Lexington, Ohio 44904
(419) 884-1219 Phone
(419) 884-4172 Direct
(419) 884-4196 Fax
Dan.Bookwalter@Dan.... This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
1.95 ms resolution ??? I really need it to be faster....
Dan Bookwalter N8DCJ FOC 1707
Hi-Stat a Stoneridge Co.
345 South Mill St.
Lexington, Ohio 44904
(419) 884-1219 Phone
(419) 884-4172 Direct
(419) 884-4196 Fax
Dan.Bookwalter@Dan.... This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: RTC on the BX-24P - arhodes19044 - Jan 20 11:46:00 2006
--- In basicx@basi..., "Bookwalter, Dan"
<Dan.Bookwalter@h...> wrote:
>
> Does the real time clock on the latest version of the BX-24 still
have
> 1.95 ms resolution ??? I really need it to be faster....
I believe it does.
The ZX-24 has a higher resolution timer if you need it. I believe
the ZX-24 has 1/1024 second resolution.
I suppose using timers you can get higher resolution than that, even
on the BX-24. You can use timer1 or timer2 on the AVR hardware to
have much higher resolution, but the higher the resolution, the
sooner it rolls-over.
How much resolution do you need?
When I need RTC, I rarely need better than 1/1024, but I really need
little drift over time.
My solution was to use an external RTC. I found the Dallas DS3231
to work really well. You can get it to trigger interrupts at 1,
1024, 8192, 32768 hz, as I remember. It is very accurate and it is
temperature compensated.
You can achieve nearly the same effect with the Dallas DS32KHZ
precision oscillator, and an RTC of your choice (1307, 1332 both are
good.
What are your granularity and precision needs?
-Tony
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
<Dan.Bookwalter@h...> wrote:
>
> Does the real time clock on the latest version of the BX-24 still
have
> 1.95 ms resolution ??? I really need it to be faster....
I believe it does.
The ZX-24 has a higher resolution timer if you need it. I believe
the ZX-24 has 1/1024 second resolution.
I suppose using timers you can get higher resolution than that, even
on the BX-24. You can use timer1 or timer2 on the AVR hardware to
have much higher resolution, but the higher the resolution, the
sooner it rolls-over.
How much resolution do you need?
When I need RTC, I rarely need better than 1/1024, but I really need
little drift over time.
My solution was to use an external RTC. I found the Dallas DS3231
to work really well. You can get it to trigger interrupts at 1,
1024, 8192, 32768 hz, as I remember. It is very accurate and it is
temperature compensated.
You can achieve nearly the same effect with the Dallas DS32KHZ
precision oscillator, and an RTC of your choice (1307, 1332 both are
good.
What are your granularity and precision needs?
-Tony
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
RE: Re: RTC on the BX-24P - Bookwalter, Dan - Jan 20 12:39:00 2006
Tony
1/1024 would work for me.... How do you access those timers ??
Thanks
Dan
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of arhodes19044
Sent: Friday, January 20, 2006 10:46 AM
To: basicx@basi...
Subject: [BasicX] Re: RTC on the BX-24P
--- In basicx@basi..., "Bookwalter, Dan"
<Dan.Bookwalter@h...> wrote:
>
> Does the real time clock on the latest version of the BX-24 still
have
> 1.95 ms resolution ??? I really need it to be faster....
I believe it does.
The ZX-24 has a higher resolution timer if you need it. I believe
the ZX-24 has 1/1024 second resolution.
I suppose using timers you can get higher resolution than that, even
on the BX-24. You can use timer1 or timer2 on the AVR hardware to
have much higher resolution, but the higher the resolution, the
sooner it rolls-over.
How much resolution do you need?
When I need RTC, I rarely need better than 1/1024, but I really need
little drift over time.
My solution was to use an external RTC. I found the Dallas DS3231
to work really well. You can get it to trigger interrupts at 1,
1024, 8192, 32768 hz, as I remember. It is very accurate and it is
temperature compensated.
You can achieve nearly the same effect with the Dallas DS32KHZ
precision oscillator, and an RTC of your choice (1307, 1332 both are
good.
What are your granularity and precision needs?
-Tony
SPONSORED LINKS
Microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microcontroller
s&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=
Violator&c=5&s=109&.sig=UdDdAWF2bsDy6v0lWlSEtw>
Microprocessor
<http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microcontrollers&
w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Vi
olator&c=5&s=109&.sig=VoadJ1bamd8enA4LX6dEuw>
Intel microprocessors
<http://groups.yahoo.com/gads?t=ms&k=Intel+microprocessors&w1=Microcontr
ollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontroller
s&w5=Violator&c=5&s=109&.sig=A0qO367q4CvK0whGJ-ohOg>
Pic microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microcontro
llers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers
&w5=Violator&c=5&s=109&.sig=F3L2CjmP1R6IWV2-gLceaQ>
Violator
<http://groups.yahoo.com/gads?t=ms&k=Violator&w1=Microcontrollers&w2=Mic
roprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Violator
&c=5&s=109&.sig=4yvg0zfOI-hw6niZ7LVckA ________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
1/1024 would work for me.... How do you access those timers ??
Thanks
Dan
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of arhodes19044
Sent: Friday, January 20, 2006 10:46 AM
To: basicx@basi...
Subject: [BasicX] Re: RTC on the BX-24P
--- In basicx@basi..., "Bookwalter, Dan"
<Dan.Bookwalter@h...> wrote:
>
> Does the real time clock on the latest version of the BX-24 still
have
> 1.95 ms resolution ??? I really need it to be faster....
I believe it does.
The ZX-24 has a higher resolution timer if you need it. I believe
the ZX-24 has 1/1024 second resolution.
I suppose using timers you can get higher resolution than that, even
on the BX-24. You can use timer1 or timer2 on the AVR hardware to
have much higher resolution, but the higher the resolution, the
sooner it rolls-over.
How much resolution do you need?
When I need RTC, I rarely need better than 1/1024, but I really need
little drift over time.
My solution was to use an external RTC. I found the Dallas DS3231
to work really well. You can get it to trigger interrupts at 1,
1024, 8192, 32768 hz, as I remember. It is very accurate and it is
temperature compensated.
You can achieve nearly the same effect with the Dallas DS32KHZ
precision oscillator, and an RTC of your choice (1307, 1332 both are
good.
What are your granularity and precision needs?
-Tony
SPONSORED LINKS
Microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microcontroller
s&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=
Violator&c=5&s=109&.sig=UdDdAWF2bsDy6v0lWlSEtw>
Microprocessor
<http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microcontrollers&
w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Vi
olator&c=5&s=109&.sig=VoadJ1bamd8enA4LX6dEuw>
Intel microprocessors
<http://groups.yahoo.com/gads?t=ms&k=Intel+microprocessors&w1=Microcontr
ollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontroller
s&w5=Violator&c=5&s=109&.sig=A0qO367q4CvK0whGJ-ohOg>
Pic microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microcontro
llers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers
&w5=Violator&c=5&s=109&.sig=F3L2CjmP1R6IWV2-gLceaQ>
Violator
<http://groups.yahoo.com/gads?t=ms&k=Violator&w1=Microcontrollers&w2=Mic
roprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Violator
&c=5&s=109&.sig=4yvg0zfOI-hw6niZ7LVckA ________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: Re: RTC on the BX-24P - Tom Becker - Jan 20 14:02:00 2006
> ... 1/1024 would work for me. How do you access those timers?
Timer uses are documented in Application Notes and example code, and in
the Atmel ATmega8535 documentation, and you will find many mentions in
the message archives. Doubling the RTC rate is not quite so simple,
though, because the tick rate also affects other OS functions.
Just what do you want to do? Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Timer uses are documented in Application Notes and example code, and in
the Atmel ATmega8535 documentation, and you will find many mentions in
the message archives. Doubling the RTC rate is not quite so simple,
though, because the tick rate also affects other OS functions.
Just what do you want to do? Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: RTC on the BX-24P - arhodes19044 - Jan 20 14:22:00 2006
--- In basicx@basi..., "Bookwalter, Dan"
<Dan.Bookwalter@h...> wrote:
> 1/1024 would work for me.... How do you access those timers ?? Well, the simple 1/1024 timer is available on a different product
(the ZX-24).
But you access the AVR hadware timer in a somewhat complex manner,
especially for the non-avr-hardware-expert.
you have to use TCNT1 and TCCR1 to set the timer speed (a fraction
of the main clock speed) and other aspects.
It is in the manuals, as well as an app note on dual PWM. There is
also an app note on programming timer1 as a stopwatch. By combining
them, you can create a timed interrupt.
Depending on your application, you may just want to let it count
freely, and then check the count periodically.
As mentioned above, you can also have it set a pin at 25/26/27 when
the count reaches a certain amount. You can then wire that pin to
the external interrupt pin of the BX. This will create a user-
defined high resolution interrupt. You may not be able to achieve
exactly 1024 hz, but you will get a very accurate interval, whatever
is specifically is.
Creating an interrupt at regular intervals is a pretty simple
application of the timer/counter hardware. I would not be surprised
that there is an app note specifically for that purpose, or if not,
there probably is something here in the messages that goes into
specifics.
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
<Dan.Bookwalter@h...> wrote:
> 1/1024 would work for me.... How do you access those timers ?? Well, the simple 1/1024 timer is available on a different product
(the ZX-24).
But you access the AVR hadware timer in a somewhat complex manner,
especially for the non-avr-hardware-expert.
you have to use TCNT1 and TCCR1 to set the timer speed (a fraction
of the main clock speed) and other aspects.
It is in the manuals, as well as an app note on dual PWM. There is
also an app note on programming timer1 as a stopwatch. By combining
them, you can create a timed interrupt.
Depending on your application, you may just want to let it count
freely, and then check the count periodically.
As mentioned above, you can also have it set a pin at 25/26/27 when
the count reaches a certain amount. You can then wire that pin to
the external interrupt pin of the BX. This will create a user-
defined high resolution interrupt. You may not be able to achieve
exactly 1024 hz, but you will get a very accurate interval, whatever
is specifically is.
Creating an interrupt at regular intervals is a pretty simple
application of the timer/counter hardware. I would not be surprised
that there is an app note specifically for that purpose, or if not,
there probably is something here in the messages that goes into
specifics.
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: Re: RTC on the BX-24P - Tom Becker - Jan 20 14:52:00 2006
These might help you:
http://groups.yahoo.com/group/basicx/message/19606
http://groups.yahoo.com/group/basicx/message/19707
http://groups.yahoo.com/group/basicx/message/19217 Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
http://groups.yahoo.com/group/basicx/message/19606
http://groups.yahoo.com/group/basicx/message/19707
http://groups.yahoo.com/group/basicx/message/19217 Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
RE: Re: RTC on the BX-24P - Bookwalter, Dan - Jan 20 14:58:00 2006
Well by looking at the ZX-24 online real quick it appears that it's pin
for pin the same as the BX-24... the programming looks the same also ???
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of arhodes19044
Sent: Friday, January 20, 2006 1:22 PM
To: basicx@basi...
Subject: [BasicX] Re: RTC on the BX-24P
--- In basicx@basi..., "Bookwalter, Dan"
<Dan.Bookwalter@h...> wrote:
> 1/1024 would work for me.... How do you access those timers ?? Well, the simple 1/1024 timer is available on a different product
(the ZX-24).
But you access the AVR hadware timer in a somewhat complex manner,
especially for the non-avr-hardware-expert.
you have to use TCNT1 and TCCR1 to set the timer speed (a fraction
of the main clock speed) and other aspects.
It is in the manuals, as well as an app note on dual PWM. There is
also an app note on programming timer1 as a stopwatch. By combining
them, you can create a timed interrupt.
Depending on your application, you may just want to let it count
freely, and then check the count periodically.
As mentioned above, you can also have it set a pin at 25/26/27 when
the count reaches a certain amount. You can then wire that pin to
the external interrupt pin of the BX. This will create a user-
defined high resolution interrupt. You may not be able to achieve
exactly 1024 hz, but you will get a very accurate interval, whatever
is specifically is.
Creating an interrupt at regular intervals is a pretty simple
application of the timer/counter hardware. I would not be surprised
that there is an app note specifically for that purpose, or if not,
there probably is something here in the messages that goes into
specifics.
________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
for pin the same as the BX-24... the programming looks the same also ???
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of arhodes19044
Sent: Friday, January 20, 2006 1:22 PM
To: basicx@basi...
Subject: [BasicX] Re: RTC on the BX-24P
--- In basicx@basi..., "Bookwalter, Dan"
<Dan.Bookwalter@h...> wrote:
> 1/1024 would work for me.... How do you access those timers ?? Well, the simple 1/1024 timer is available on a different product
(the ZX-24).
But you access the AVR hadware timer in a somewhat complex manner,
especially for the non-avr-hardware-expert.
you have to use TCNT1 and TCCR1 to set the timer speed (a fraction
of the main clock speed) and other aspects.
It is in the manuals, as well as an app note on dual PWM. There is
also an app note on programming timer1 as a stopwatch. By combining
them, you can create a timed interrupt.
Depending on your application, you may just want to let it count
freely, and then check the count periodically.
As mentioned above, you can also have it set a pin at 25/26/27 when
the count reaches a certain amount. You can then wire that pin to
the external interrupt pin of the BX. This will create a user-
defined high resolution interrupt. You may not be able to achieve
exactly 1024 hz, but you will get a very accurate interval, whatever
is specifically is.
Creating an interrupt at regular intervals is a pretty simple
application of the timer/counter hardware. I would not be surprised
that there is an app note specifically for that purpose, or if not,
there probably is something here in the messages that goes into
specifics.
________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: RTC on the BX-24P - Tom Becker - Jan 20 15:03:00 2006
> ... the programming looks the same also?
Wrong group for that processor, Dan. Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Wrong group for that processor, Dan. Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
RE: Re: RTC on the BX-24P - Bookwalter, Dan - Jan 20 15:18:00 2006
Yeah , I was kind of asking the guy who posted the response to me
regarding the timing etc...
Dan
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of Tom Becker
Sent: Friday, January 20, 2006 2:04 PM
To: basicx@basi...
Subject: [BasicX] Re: RTC on the BX-24P
> ... the programming looks the same also?
Wrong group for that processor, Dan. Tom ________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
regarding the timing etc...
Dan
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of Tom Becker
Sent: Friday, January 20, 2006 2:04 PM
To: basicx@basi...
Subject: [BasicX] Re: RTC on the BX-24P
> ... the programming looks the same also?
Wrong group for that processor, Dan. Tom ________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: RTC on the BX-24P - arhodes19044 - Jan 20 15:43:00 2006
--- In basicx@basi..., "Tom Becker" <gtbecker@r...> wrote:
>
> > ... the programming looks the same also?
>
> Wrong group for that processor, Dan. > Tom Yes, you can find forums specific to that family of hardware for
specific questions.
You have not specified your application. As I said before, you can
have a slick solution by creating a interrupt-controlled
(WaitForInterrupt) task that gets executed on a very precise basis
(within the limits of the multitasking task switching) by using the
hardware timers and routing a timer pin to the external interrupt
pin.
In this way, you can get arbitrarily high granularity on the timer
(degraded by the task switching lag) on a BX.
I am not sure of the practical upper end of interrupt frequency. I
would not want to go much higher than around 1024hz, though. I
wonder if anyone has ever checked on an oscilloscope the lag between
the interrupt pin changing, and the interrupt service, and how that
compares to the frequency of the interrupt.
One question would be whether the 512hz heartbeat of the BX hardware
creates a good/bad "resonance" with the external interrupts.
Also, remember to keep the code inside the interrupt service routine
as BRIEF as possible. This general rule can be broken as necessary
with the understanding that apparent continuity of foreground tasks
will be degraded as the length of the ISR increases.
-Tony
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
>
> > ... the programming looks the same also?
>
> Wrong group for that processor, Dan. > Tom Yes, you can find forums specific to that family of hardware for
specific questions.
You have not specified your application. As I said before, you can
have a slick solution by creating a interrupt-controlled
(WaitForInterrupt) task that gets executed on a very precise basis
(within the limits of the multitasking task switching) by using the
hardware timers and routing a timer pin to the external interrupt
pin.
In this way, you can get arbitrarily high granularity on the timer
(degraded by the task switching lag) on a BX.
I am not sure of the practical upper end of interrupt frequency. I
would not want to go much higher than around 1024hz, though. I
wonder if anyone has ever checked on an oscilloscope the lag between
the interrupt pin changing, and the interrupt service, and how that
compares to the frequency of the interrupt.
One question would be whether the 512hz heartbeat of the BX hardware
creates a good/bad "resonance" with the external interrupts.
Also, remember to keep the code inside the interrupt service routine
as BRIEF as possible. This general rule can be broken as necessary
with the understanding that apparent continuity of foreground tasks
will be degraded as the length of the ISR increases.
-Tony
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: RTC on the BX-24P - arhodes19044 - Jan 20 15:56:00 2006
I just did some quick math and checking.
If you set TCCR1B to "2" you will get a timer frequency of 921,600 hz
If you then set it toggle the pin every 450 ticks (count to 449), you
will get a period of 900 ticks, which is 1/1024 second.
If you then set the external interrupt for either rising edge or
falling edge, then you will generate an external interrupt of 1024 hz.
If you set the external interrupt to ANY change in state, then you
would set the coounter to change the pin every 900 ticks (count to
899).
Easy as pie (and probably as clear as dish water).
-Tony
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
If you set TCCR1B to "2" you will get a timer frequency of 921,600 hz
If you then set it toggle the pin every 450 ticks (count to 449), you
will get a period of 900 ticks, which is 1/1024 second.
If you then set the external interrupt for either rising edge or
falling edge, then you will generate an external interrupt of 1024 hz.
If you set the external interrupt to ANY change in state, then you
would set the coounter to change the pin every 900 ticks (count to
899).
Easy as pie (and probably as clear as dish water).
-Tony
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
RE: Re: RTC on the BX-24P - Bookwalter, Dan - Jan 20 15:58:00 2006
Tony
I just need better resolution for some timing on an output... I am
working through the Timer example now and I think I'll be able to
utilize the BX to get what I need...
Thanks
Dan
p.s. the ZX looks interesting though.... But if I get the timing worked
out I cant think of any reason to change.
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of arhodes19044
Sent: Friday, January 20, 2006 2:44 PM
To: basicx@basi...
Subject: [BasicX] Re: RTC on the BX-24P
--- In basicx@basi..., "Tom Becker" <gtbecker@r...> wrote:
>
> > ... the programming looks the same also?
>
> Wrong group for that processor, Dan. > Tom Yes, you can find forums specific to that family of hardware for
specific questions.
You have not specified your application. As I said before, you can
have a slick solution by creating a interrupt-controlled
(WaitForInterrupt) task that gets executed on a very precise basis
(within the limits of the multitasking task switching) by using the
hardware timers and routing a timer pin to the external interrupt
pin.
In this way, you can get arbitrarily high granularity on the timer
(degraded by the task switching lag) on a BX.
I am not sure of the practical upper end of interrupt frequency. I
would not want to go much higher than around 1024hz, though. I
wonder if anyone has ever checked on an oscilloscope the lag between
the interrupt pin changing, and the interrupt service, and how that
compares to the frequency of the interrupt.
One question would be whether the 512hz heartbeat of the BX hardware
creates a good/bad "resonance" with the external interrupts.
Also, remember to keep the code inside the interrupt service routine
as BRIEF as possible. This general rule can be broken as necessary
with the understanding that apparent continuity of foreground tasks
will be degraded as the length of the ISR increases.
-Tony
SPONSORED LINKS
Microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microcontroller
s&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=
Violator&c=5&s=109&.sig=UdDdAWF2bsDy6v0lWlSEtw>
Microprocessor
<http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microcontrollers&
w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Vi
olator&c=5&s=109&.sig=VoadJ1bamd8enA4LX6dEuw>
Intel microprocessors
<http://groups.yahoo.com/gads?t=ms&k=Intel+microprocessors&w1=Microcontr
ollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontroller
s&w5=Violator&c=5&s=109&.sig=A0qO367q4CvK0whGJ-ohOg>
Pic microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microcontro
llers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers
&w5=Violator&c=5&s=109&.sig=F3L2CjmP1R6IWV2-gLceaQ>
Violator
<http://groups.yahoo.com/gads?t=ms&k=Violator&w1=Microcontrollers&w2=Mic
roprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Violator
&c=5&s=109&.sig=4yvg0zfOI-hw6niZ7LVckA ________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
I just need better resolution for some timing on an output... I am
working through the Timer example now and I think I'll be able to
utilize the BX to get what I need...
Thanks
Dan
p.s. the ZX looks interesting though.... But if I get the timing worked
out I cant think of any reason to change.
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of arhodes19044
Sent: Friday, January 20, 2006 2:44 PM
To: basicx@basi...
Subject: [BasicX] Re: RTC on the BX-24P
--- In basicx@basi..., "Tom Becker" <gtbecker@r...> wrote:
>
> > ... the programming looks the same also?
>
> Wrong group for that processor, Dan. > Tom Yes, you can find forums specific to that family of hardware for
specific questions.
You have not specified your application. As I said before, you can
have a slick solution by creating a interrupt-controlled
(WaitForInterrupt) task that gets executed on a very precise basis
(within the limits of the multitasking task switching) by using the
hardware timers and routing a timer pin to the external interrupt
pin.
In this way, you can get arbitrarily high granularity on the timer
(degraded by the task switching lag) on a BX.
I am not sure of the practical upper end of interrupt frequency. I
would not want to go much higher than around 1024hz, though. I
wonder if anyone has ever checked on an oscilloscope the lag between
the interrupt pin changing, and the interrupt service, and how that
compares to the frequency of the interrupt.
One question would be whether the 512hz heartbeat of the BX hardware
creates a good/bad "resonance" with the external interrupts.
Also, remember to keep the code inside the interrupt service routine
as BRIEF as possible. This general rule can be broken as necessary
with the understanding that apparent continuity of foreground tasks
will be degraded as the length of the ISR increases.
-Tony
SPONSORED LINKS
Microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microcontroller
s&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=
Violator&c=5&s=109&.sig=UdDdAWF2bsDy6v0lWlSEtw>
Microprocessor
<http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microcontrollers&
w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Vi
olator&c=5&s=109&.sig=VoadJ1bamd8enA4LX6dEuw>
Intel microprocessors
<http://groups.yahoo.com/gads?t=ms&k=Intel+microprocessors&w1=Microcontr
ollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontroller
s&w5=Violator&c=5&s=109&.sig=A0qO367q4CvK0whGJ-ohOg>
Pic microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microcontro
llers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers
&w5=Violator&c=5&s=109&.sig=F3L2CjmP1R6IWV2-gLceaQ>
Violator
<http://groups.yahoo.com/gads?t=ms&k=Violator&w1=Microcontrollers&w2=Mic
roprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Violator
&c=5&s=109&.sig=4yvg0zfOI-hw6niZ7LVckA ________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
RE: Re: RTC on the BX-24P - Bookwalter, Dan - Jan 20 16:02:00 2006
Tony
I'll look into that and see what I can work up....
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of arhodes19044
Sent: Friday, January 20, 2006 2:57 PM
To: basicx@basi...
Subject: [BasicX] Re: RTC on the BX-24P
I just did some quick math and checking.
If you set TCCR1B to "2" you will get a timer frequency of 921,600 hz
If you then set it toggle the pin every 450 ticks (count to 449), you
will get a period of 900 ticks, which is 1/1024 second.
If you then set the external interrupt for either rising edge or
falling edge, then you will generate an external interrupt of 1024 hz.
If you set the external interrupt to ANY change in state, then you
would set the coounter to change the pin every 900 ticks (count to
899).
Easy as pie (and probably as clear as dish water).
-Tony
________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
I'll look into that and see what I can work up....
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of arhodes19044
Sent: Friday, January 20, 2006 2:57 PM
To: basicx@basi...
Subject: [BasicX] Re: RTC on the BX-24P
I just did some quick math and checking.
If you set TCCR1B to "2" you will get a timer frequency of 921,600 hz
If you then set it toggle the pin every 450 ticks (count to 449), you
will get a period of 900 ticks, which is 1/1024 second.
If you then set the external interrupt for either rising edge or
falling edge, then you will generate an external interrupt of 1024 hz.
If you set the external interrupt to ANY change in state, then you
would set the coounter to change the pin every 900 ticks (count to
899).
Easy as pie (and probably as clear as dish water).
-Tony
________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
RE: Re: RTC on the BX-24P - Bookwalter, Dan - Jan 23 12:19:00 2006
Tom
Well I need to make a Cycler that I can set the on/off intervals
anywhere from about 0.1 HZ to 30 HZ.... The ~2ms clock just doesn't have
the resolution I need.... And at the same time I need to display the
cycle count to a digital display via com3 , so , now I have a problem
with using timer1 and com3. I haven't messed around with these BX-24's
for awhile so I am going to have to dig back into the doc's and see what
I can do. I am able to do it using multitasking and setting sleep times
but I really don't like this approach that well.
Dan
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of Tom Becker
Sent: Friday, January 20, 2006 1:03 PM
To: basicx@basi...
Subject: Re: [BasicX] Re: RTC on the BX-24P
> ... 1/1024 would work for me. How do you access those timers?
Timer uses are documented in Application Notes and example code, and in
the Atmel ATmega8535 documentation, and you will find many mentions in
the message archives. Doubling the RTC rate is not quite so simple,
though, because the tick rate also affects other OS functions.
Just what do you want to do? Tom
SPONSORED LINKS
Microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microcontroller
s&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=
Violator&c=5&s=109&.sig=UdDdAWF2bsDy6v0lWlSEtw>
Microprocessor
<http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microcontrollers&
w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Vi
olator&c=5&s=109&.sig=VoadJ1bamd8enA4LX6dEuw>
Intel microprocessors
<http://groups.yahoo.com/gads?t=ms&k=Intel+microprocessors&w1=Microcontr
ollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontroller
s&w5=Violator&c=5&s=109&.sig=A0qO367q4CvK0whGJ-ohOg>
Pic microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microcontro
llers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers
&w5=Violator&c=5&s=109&.sig=F3L2CjmP1R6IWV2-gLceaQ>
Violator
<http://groups.yahoo.com/gads?t=ms&k=Violator&w1=Microcontrollers&w2=Mic
roprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Violator
&c=5&s=109&.sig=4yvg0zfOI-hw6niZ7LVckA ________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Well I need to make a Cycler that I can set the on/off intervals
anywhere from about 0.1 HZ to 30 HZ.... The ~2ms clock just doesn't have
the resolution I need.... And at the same time I need to display the
cycle count to a digital display via com3 , so , now I have a problem
with using timer1 and com3. I haven't messed around with these BX-24's
for awhile so I am going to have to dig back into the doc's and see what
I can do. I am able to do it using multitasking and setting sleep times
but I really don't like this approach that well.
Dan
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of Tom Becker
Sent: Friday, January 20, 2006 1:03 PM
To: basicx@basi...
Subject: Re: [BasicX] Re: RTC on the BX-24P
> ... 1/1024 would work for me. How do you access those timers?
Timer uses are documented in Application Notes and example code, and in
the Atmel ATmega8535 documentation, and you will find many mentions in
the message archives. Doubling the RTC rate is not quite so simple,
though, because the tick rate also affects other OS functions.
Just what do you want to do? Tom
SPONSORED LINKS
Microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microcontroller
s&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=
Violator&c=5&s=109&.sig=UdDdAWF2bsDy6v0lWlSEtw>
Microprocessor
<http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microcontrollers&
w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Vi
olator&c=5&s=109&.sig=VoadJ1bamd8enA4LX6dEuw>
Intel microprocessors
<http://groups.yahoo.com/gads?t=ms&k=Intel+microprocessors&w1=Microcontr
ollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontroller
s&w5=Violator&c=5&s=109&.sig=A0qO367q4CvK0whGJ-ohOg>
Pic microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microcontro
llers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers
&w5=Violator&c=5&s=109&.sig=F3L2CjmP1R6IWV2-gLceaQ>
Violator
<http://groups.yahoo.com/gads?t=ms&k=Violator&w1=Microcontrollers&w2=Mic
roprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Violator
&c=5&s=109&.sig=4yvg0zfOI-hw6niZ7LVckA ________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
RE: Re: RTC on the BX-24P - Bookwalter, Dan - Jan 23 15:49:00 2006
Hmmm..... well that's good news...
But this is what the docs that I have say ??
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of Tom Becker
Sent: Monday, January 23, 2006 12:04 PM
To: basicx@basi...
Subject: Re: [BasicX] Re: RTC on the BX-24P
> ... I have a problem with using Timer1 and COM3...
COM3 uses Timer2; Timer1 would still be available. Tom
SPONSORED LINKS
Microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microcontroller
s&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=
Violator&c=5&s=109&.sig=UdDdAWF2bsDy6v0lWlSEtw>
Microprocessor
<http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microcontrollers&
w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Vi
olator&c=5&s=109&.sig=VoadJ1bamd8enA4LX6dEuw>
Intel microprocessors
<http://groups.yahoo.com/gads?t=ms&k=Intel+microprocessors&w1=Microcontr
ollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontroller
s&w5=Violator&c=5&s=109&.sig=A0qO367q4CvK0whGJ-ohOg>
Pic microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microcontro
llers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers
&w5=Violator&c=5&s=109&.sig=F3L2CjmP1R6IWV2-gLceaQ>
Violator
<http://groups.yahoo.com/gads?t=ms&k=Violator&w1=Microcontrollers&w2=Mic
roprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Violator
&c=5&s=109&.sig=4yvg0zfOI-hw6niZ7LVckA ________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
But this is what the docs that I have say ??
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of Tom Becker
Sent: Monday, January 23, 2006 12:04 PM
To: basicx@basi...
Subject: Re: [BasicX] Re: RTC on the BX-24P
> ... I have a problem with using Timer1 and COM3...
COM3 uses Timer2; Timer1 would still be available. Tom
SPONSORED LINKS
Microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Microcontrollers&w1=Microcontroller
s&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=
Violator&c=5&s=109&.sig=UdDdAWF2bsDy6v0lWlSEtw>
Microprocessor
<http://groups.yahoo.com/gads?t=ms&k=Microprocessor&w1=Microcontrollers&
w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Vi
olator&c=5&s=109&.sig=VoadJ1bamd8enA4LX6dEuw>
Intel microprocessors
<http://groups.yahoo.com/gads?t=ms&k=Intel+microprocessors&w1=Microcontr
ollers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontroller
s&w5=Violator&c=5&s=109&.sig=A0qO367q4CvK0whGJ-ohOg>
Pic microcontrollers
<http://groups.yahoo.com/gads?t=ms&k=Pic+microcontrollers&w1=Microcontro
llers&w2=Microprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers
&w5=Violator&c=5&s=109&.sig=F3L2CjmP1R6IWV2-gLceaQ>
Violator
<http://groups.yahoo.com/gads?t=ms&k=Violator&w1=Microcontrollers&w2=Mic
roprocessor&w3=Intel+microprocessors&w4=Pic+microcontrollers&w5=Violator
&c=5&s=109&.sig=4yvg0zfOI-hw6niZ7LVckA ________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
RE: Re: RTC on the BX-24P - Bookwalter, Dan - Jan 23 16:17:00 2006
The docs that installed with the compiler/editor...
On windows
Start --> All Programs -> BasicX -> BasicX Docs -> BX-24 Doc Overview ->
Programming Timer1 as a Stopwatch
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of Tom Becker
Sent: Monday, January 23, 2006 3:09 PM
To: basicx@basi...
Subject: [BasicX] Re: RTC on the BX-24P
> ... the docs that I have...
Your documentation explicitly says that COM3 uses Timer1? What docs
are those? Tom
________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
On windows
Start --> All Programs -> BasicX -> BasicX Docs -> BX-24 Doc Overview ->
Programming Timer1 as a Stopwatch
________________________________
From: basicx@basi... [mailto:basicx@basi...] On Behalf
Of Tom Becker
Sent: Monday, January 23, 2006 3:09 PM
To: basicx@basi...
Subject: [BasicX] Re: RTC on the BX-24P
> ... the docs that I have...
Your documentation explicitly says that COM3 uses Timer1? What docs
are those? Tom
________________________________
> .
________________________________ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to postmaster@post....
[Non-text portions of this message have been removed]
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )