Matrix user forums

Hi Support team
I recently designed a board which employed an LCD display supplied by Crystalfontz. The display is pin and function compatible Flowcode. The target application required the finished product to be placed in strong RF fields, and so I decoupled the data and control lines of the display ...

I am answering my own question here

correct C code for pull-ups is

(
option_reg=0x7F;
)

Hi ben
very timely posting.

I have a display driven from Port D of 877a. As we have many 16Mhz xtals in stock, I thought I would use those, and set the osc frequency in flow code to either 10 or 20 Mhz, but the display only displays corrupted characters, with any setting.

If I put a 4mhz xtal in ...

Hello support team
I am using a 16F877a chip and wish to turn on the port B pull-ups.

In my C-code box I have

/*
(
option_reg=0x7F;
)
*/

This compiles without error, but the ports are not showing pull up volts.
can you help?
Joe

Hi Steve
thanks for the prompt response. I downloaded the fix (zip file) and after unzipping found 3 files
boostc++.pic16
boostc++.pic18
boostc++.plc

I ran the pic 16 file as I am working on this series of chip, the dos code window shows code activity, and then I ran flow code again trying to ...

Using flowcode 3.2.1.38
Target chip 16F877A
Code sent to Steve via email
Function readmode is called only once ?
“bank switch” error not understood.

BoostLink Optimizing Linker Version 6.70
http://www.sourceboost.com
Copyright(C) 2004-2007 Pavel Baranov
Copyright(C) 2004-2007 David Hobday ...

Yes, I think I now see what was going on.

In my code I had

instruction-x
timer enable
instruction-X+1

And so I think from your explination, timer enable would fire the Ir routine and the code pointer would point back to instruction-x and not x+1

so the point of return would be the timer enable ...

Hi Steve & Ben
firslty an appology for not responding, but I have been away for a number of weeks.

Secondly re Steve's point, I understood that all pros disable the interupt timer when servicing an interupt routine. It was explained to me that if the I-timer refired quicker than it takes to run the ...

Interrupts

I have a line of flow code symbols which are my opening code to the program, among other things they reset variables and memory to zero.

The penultimate call is to enable Timer0 which calls a service routine. The interrupt frequency is set to 19200 Hz.

The first thing I do in my ...

There comes a time when it is quicker to upgrade your application software without removing the PIC from the target hardware, or it may be you have chosen a surface mount PIC.

You can flash program your target device whilst it is in circuit using your Matrix Multimedia development board as a ...

Hey guys, I also wrote my first Pic code just 3 days ago, but I have been a radio comms engineer for 42 years. I really enjoyed reading through this particular item.

The bouncy switch question should also take into account the fact that most switches on micro system pass very little or no current ...