Tom Harris celephi...@gmail.com
On 13 March 2014 01:21, Chris Albertson albertson.ch...@gmail.com wrote:
Sorry forgot to add this.
As for delayed turn on. That can work but why not simply have the software
go into a 5 or 10 second wait before it does anything else. Display
warming up or
Are you putting the unknown signal to be measured on an interrupt pin?
that will work for low enough frequencies but most uPs have a built-in
counter. It is a hardware register on the uP chip that will increment for
each pulse on a pin. then you read that number and divide by the gate
time.
Sorry forgot to add this.
As for delayed turn on. That can work but why not simply have the software
go into a 5 or 10 second wait before it does anything else. Display
warming up or please wait on the LCD.
On Wed, Mar 12, 2014 at 7:18 AM, Chris Albertson
albertson.ch...@gmail.comwrote:
I am using old Wavetek 180 signal generator for the tests. I just hooked
its TTL output directly to the pin of MCU. The STM32F4xx has core clock
168 mHz and its inputs capable to handle pretty wide range of frequency.
I don't think 1-2 mHz connected to the pin should be a problem. At least
LCD connected to the same MCU. And it has relation to the core clock
too. So, nothing on LCD before I reset entire MCU. I think initial
incorrect core clock reading cause a lot of issues. Probably my only
option will be to implement some external relay and timer to turn on MCU
few seconds
On Wed, 12 Mar 2014 11:48:04 -0400, d0ct0r wrote:
LCD connected to the same MCU. And it has relation to the core clock
too. So, nothing on LCD before I reset entire MCU. I think initial
incorrect core clock reading cause a lot of issues. Probably my only
option will be to implement some
On Wed, Mar 12, 2014 at 10:48 AM, d0ct0r t...@patoka.org wrote:
LCD connected to the same MCU. And it has relation to the core clock too.
So, nothing on LCD before I reset entire MCU. I think initial incorrect
core clock reading cause a lot of issues. Probably my only option will be
to
On Wed, Mar 12, 2014 at 9:10 AM, cfo xne...@luna.dyndns.dk wrote:
On Wed, 12 Mar 2014 11:48:04 -0400, d0ct0r wrote:
If you have a conditioning circuit betewwn the OCXO and the STM , i'd
like to see it. As i have the need for one , trying to interface a 5v OCXO
to a NXP 1114 Arm , that wants
xne...@luna.dyndns.dk said:
If you have a conditioning circuit betewwn the OCXO and the STM , i'd like
to see it. As i have the need for one , trying to interface a 5v OCXO to a
NXP 1114 Arm , that wants max 1.8v in the clockinput.
What's wrong with a simple resistive divider?
--
These
On Wed, 12 Mar 2014 09:42:05 -0700, Chris Albertson wrote:
There are logic level converter chip made for this purpose or you can
use a comparator and compare the 5V clock to ground. Or just a diode to
clip the sine wave. If you connect a code. Sometimes you can set buy
with a pair of
Try:
http://www.linear.com/product/LTC6957
Bruce
cfo wrote:
On Wed, 12 Mar 2014 09:42:05 -0700, Chris Albertson wrote:
There are logic level converter chip made for this purpose or you can
use a comparator and compare the 5V clock to ground. Or just a diode to
clip the sine
Analog Devices, Linear Technology and Maxim have fast comparators
73
Alex
On 3/12/2014 11:02 AM, cfo wrote:
On Wed, 12 Mar 2014 09:42:05 -0700, Chris Albertson wrote:
There are logic level converter chip made for this purpose or you can
use a comparator and compare the 5V clock to ground.
Hello,
I am experimenting to build frequency counter using external OCXO and
ST32 MCU. The OCXO is external DATUM 2750013-1 device which produce
10Mhz sine wave. I connected its output to OC_IN on MCU. I have few
challenges now.
First, looks like I need to create some delay to turn on MCU
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