Greetings!

I would like to know if anyone has been successful developing an
interface for 3 wire serial feed to a PLL: (Clock, data, latch enable)
using a PIC or similar devices. I presently use my computer to control
my VFO. Software is the Code Loader from National.com It works very
well. The speed of the Clock/Data appears to be high and I am wondering
if a PIC could work at the same speed and/or produce the same rise
time.!
If email is sent, please remove the xxx,

Jos! VE2AUC

The nice thing about the synchronous serial interface is that the
transmitter can clock data out at whatever speed it wants to -- so you can
bit-bang with the PIC with no problem.

You may want to check if your flavor of PIC has an SPI port -- they're
designed to implement just that kind of interface.

--
Tim Wescott, KG7LI

"Y" wrote in message
...
Greetings!

I would like to know if anyone has been successful developing an
interface for 3 wire serial feed to a PLL: (Clock, data, latch enable)
using a PIC or similar devices. I presently use my computer to control
my VFO. Software is the Code Loader from National.com It works very
well. The speed of the Clock/Data appears to be high and I am wondering
if a PIC could work at the same speed and/or produce the same rise
time.!
If email is sent, please remove the xxx,

Jos! VE2AUC

In article , says...
Greetings!

I would like to know if anyone has been successful developing an
interface for 3 wire serial feed to a PLL: (Clock, data, latch enable)
using a PIC or similar devices. I presently use my computer to control
my VFO. Software is the Code Loader from National.com It works very
well. The speed of the Clock/Data appears to be high and I am wondering
if a PIC could work at the same speed and/or produce the same rise
time.!
If email is sent, please remove the xxx,

Jos! VE2AUC


See the Atmel/Win32 multi-platform implementation of three-wire PLL
programming at http://www.qsl.net/ke5fx/synth.html (direct link to the
software at http://www.qsl.net/ke5fx/synth/synth100.zip).

It's in C++, which is not a problem for the higher-speed Atmel chips but
might not be appropriate for a PIC.

-- jm

------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------

I use the Melabs PicBasic Pro compiler (www.melabs.com) and do the coding in
Basic. It's really quite easy. With a 4MHz PIC and a software 'bit-banger'
routine, I'm loading my SPI-based DDS chip about 166Kbs.

Joe
W3JDR


"Y" wrote in message
...
Greetings!

I would like to know if anyone has been successful developing an
interface for 3 wire serial feed to a PLL: (Clock, data, latch enable)
using a PIC or similar devices. I presently use my computer to control
my VFO. Software is the Code Loader from National.com It works very
well. The speed of the Clock/Data appears to be high and I am wondering
if a PIC could work at the same speed and/or produce the same rise
time.!
If email is sent, please remove the xxx,

Jos! VE2AUC

From my point of view, a VFO completely independant of the personnal computer
is desirable. This can be done with a PIC or other microprocessor with 2
thumbwheel switches for 99 channels (or frequencies) or a two digit display
with up and down selection buttons. Ed!

John Miles wrote:

In article , says...
Greetings!

I would like to know if anyone has been successful developing an
interface for 3 wire serial feed to a PLL: (Clock, data, latch enable)
using a PIC or similar devices. I presently use my computer to control
my VFO. Software is the Code Loader from National.com It works very
well. The speed of the Clock/Data appears to be high and I am wondering
if a PIC could work at the same speed and/or produce the same rise
time.!
If email is sent, please remove the xxx,

Jos! VE2AUC


See the Atmel/Win32 multi-platform implementation of three-wire PLL
programming at http://www.qsl.net/ke5fx/synth.html (direct link to the
software at http://www.qsl.net/ke5fx/synth/synth100.zip).

It's in C++, which is not a problem for the higher-speed Atmel chips but
might not be appropriate for a PIC.

-- jm

------------------------------------------------------
http://www.qsl.net/ke5fx
Note: My E-mail address has been altered to avoid spam
------------------------------------------------------

"Ed." wrote in message
...
From my point of view, a VFO completely independant of the personnal
computer
is desirable. This can be done with a PIC or other microprocessor with 2
thumbwheel switches for 99 channels (or frequencies) or a two digit
display
with up and down selection buttons. Ed!

While encoders can be found for upwards of fifty bucks, plenty of encoders
that do a much nicer job than thumbwheel switches cost barely more than two.
And why would you use a two digit display when a nice 8 digit LCD can be had
for around five bucks, less if you're willing to hunt around. This stuff
may have made sense when it was all going to be lashed together with 7400
series logic chips, but with a PIC or other processor, the encoder and LCD
display is a lot easier, and usually cheaper, to say nothing of nicer.

...

Glad to hear about these encoders; is it possible to have info on manufacturer
to buy one? Ed.

xpyttl wrote:

"Ed." wrote in message
...
From my point of view, a VFO completely independant of the personnal
computer
is desirable. This can be done with a PIC or other microprocessor with 2
thumbwheel switches for 99 channels (or frequencies) or a two digit
display
with up and down selection buttons. Ed!

While encoders can be found for upwards of fifty bucks, plenty of encoders
that do a much nicer job than thumbwheel switches cost barely more than two.
And why would you use a two digit display when a nice 8 digit LCD can be had
for around five bucks, less if you're willing to hunt around. This stuff
may have made sense when it was all going to be lashed together with 7400
series logic chips, but with a PIC or other processor, the encoder and LCD
display is a lot easier, and usually cheaper, to say nothing of nicer.

..

Glad to hear about these encoders; is it possible to have info on manufacturer
to buy one? Ed.

xpyttl wrote:

"Ed." wrote in message
...
From my point of view, a VFO completely independant of the personnal
computer
is desirable. This can be done with a PIC or other microprocessor with 2
thumbwheel switches for 99 channels (or frequencies) or a two digit
display
with up and down selection buttons. Ed!

While encoders can be found for upwards of fifty bucks, plenty of encoders
that do a much nicer job than thumbwheel switches cost barely more than two.
And why would you use a two digit display when a nice 8 digit LCD can be had
for around five bucks, less if you're willing to hunt around. This stuff
may have made sense when it was all going to be lashed together with 7400
series logic chips, but with a PIC or other processor, the encoder and LCD
display is a lot easier, and usually cheaper, to say nothing of nicer.

..

If you go to the DigiKey catalog (www.digikey.com) there are basically 4
manufacturers. Bournes makes some pricey ones, but they also make some
small, low resolution encoders with no detents ($2.77). Pretty nice for some
things. They also have a 24 pulse model for $4.86 which has very serious
detents. Grayhill makes a number of encoders with fairly positive detents
(series 25L, $4.70). Panasonic makes encoders with a kind of soft detent.
They have a bazillion models now, ranging from 66 cents to $3.53. CTS also
makes some, and I know I've used them, but I just can't remember much about
them $2.58-$5.42.

None of these have the great feel of the $50 flavor, but you don't need that
for a lot of things.

...

"Ed" wrote in message
...
Glad to hear about these encoders; is it possible to have info on
manufacturer
to buy one? Ed.

xpyttl wrote:

"Ed." wrote in message
...
From my point of view, a VFO completely independant of the personnal
computer
is desirable. This can be done with a PIC or other microprocessor with
2
thumbwheel switches for 99 channels (or frequencies) or a two digit
display
with up and down selection buttons. Ed!

While encoders can be found for upwards of fifty bucks, plenty of
encoders
that do a much nicer job than thumbwheel switches cost barely more than
two.
And why would you use a two digit display when a nice 8 digit LCD can be
had
for around five bucks, less if you're willing to hunt around. This
stuff
may have made sense when it was all going to be lashed together with
7400
series logic chips, but with a PIC or other processor, the encoder and
LCD
display is a lot easier, and usually cheaper, to say nothing of nicer.

..

If you go to the DigiKey catalog (www.digikey.com) there are basically 4
manufacturers. Bournes makes some pricey ones, but they also make some
small, low resolution encoders with no detents ($2.77). Pretty nice for some
things. They also have a 24 pulse model for $4.86 which has very serious
detents. Grayhill makes a number of encoders with fairly positive detents
(series 25L, $4.70). Panasonic makes encoders with a kind of soft detent.
They have a bazillion models now, ranging from 66 cents to $3.53. CTS also
makes some, and I know I've used them, but I just can't remember much about
them $2.58-$5.42.

None of these have the great feel of the $50 flavor, but you don't need that
for a lot of things.

...

"Ed" wrote in message
...
Glad to hear about these encoders; is it possible to have info on
manufacturer
to buy one? Ed.

xpyttl wrote:

"Ed." wrote in message
...
From my point of view, a VFO completely independant of the personnal
computer
is desirable. This can be done with a PIC or other microprocessor with
2
thumbwheel switches for 99 channels (or frequencies) or a two digit
display
with up and down selection buttons. Ed!

While encoders can be found for upwards of fifty bucks, plenty of
encoders
that do a much nicer job than thumbwheel switches cost barely more than
two.
And why would you use a two digit display when a nice 8 digit LCD can be
had
for around five bucks, less if you're willing to hunt around. This
stuff
may have made sense when it was all going to be lashed together with
7400
series logic chips, but with a PIC or other processor, the encoder and
LCD
display is a lot easier, and usually cheaper, to say nothing of nicer.

..