Hi vasile
I will be glad to see your code, I will wait for you to search it in the
office.
In the mean time, I will be researching for the idea Eurvan give to me...
cheers.
El 28/07/13 02:24, vasile surducan escribió:
Hi Pavel,
There is an example on jallist, I've search for my own version in my
computer but it seems I have it only in my office (I hope). The example
is using TMR0, it works ok with 4MHz oscillator but is able to count
only up to 20KHz with two decimals. I have it in two versions, one with
LED display and the other with LCD disply, none of them jallib compatible.
However, if you want 50MHz count with PIC I'm afraid you'll need some
assembler too...
Vasile
On Sun, Jul 28, 2013 at 5:41 AM, Ing. Pavel Milanes Costa
<[email protected] <mailto:[email protected]>> wrote:
Hi all.
I'm here reading and searching but I can't find a way of counting
asynchronous TTL pulses with jal/jallib over a given time slot...
It must be done with the timer module of the pic... (I think...)
I explain:
I want to make a frequency counter for zero to 250 Mhz, with 2
external prescaler, using direct counting for low freq's, med
prescaler to about 50 Mhz and a dedicated prescaler for above 50 Mhz
- 250 Mhz+
But I have not a clue how to use the timer1 as an asynconous 16 bit
pulse counter of the PIC16F88 I have for the project.
Output will be to a cheap 4bit LCD or UART serial to a PC, click
will be HS 20 Mhz XTAL...
Other candidate is a PIC16F628 in my junkbox.
Math is not a problem when I can say something like:
<pseudo-code>
a = count(pin_b1,100) -- count pulses on pin B1 for 100ms
</pseudo-code>
Any clue, sample code or tip is welcomed.
73 de CO7WT, Pavel in Cuba Island.
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