Matrix user forums

I got these message when I tried to download the firmware to a 18F4455 chip. Trying to send fuse data is ok, to view the Pic Micro is ok from the PPP program. Programming a 18F4450 by put it on a HP 488 board is ok,but trying to do the same with a 18F4455 smd connected with cables to the board is no...

Thank you Ben for your reply! I tied pull up resistors on port A but no change. Any way I used this PIC type because I need 2 8bit inputs, an LCD screen and an interrupt input but it seems to be a bad choice...Maybe I will use multiplexing to do that.
Thank you again
sakis

Hello forum, can anybody help me with an issue I have programming 18F4455? I want not to use the port B due the interrupt inputs I need, so I tied the LCD to the port A and also test it on port C. With a simple program, just a "hello" printout, only on port B worked. I also connect pull up resistors...

Good morning Martin,
now it works!!! Thank you.Later today I connect it to the analog section to test the whole thing! You will have news soon...
Sakis

Good morning Martin,
I tried to compile the secont Flowcode to 16F88 but it wasn't possible due to limits(?) of the programm version I have. Any way I compile it to 18F4450 but I don't know why the programm didn't run at all...What I did
wrong?
Sakis

Hi,
The problem with that is that the product mAs=(mA*time)/1000 goes to high and I have negative numbers when it gets more than 32767...One way is to increase the delay to 10 ms but in that way I have redused resolution...
Sakis

Hello Martin,
thank you for your advice, I tested but a new problem came up...If the ms are less than 1000 the result of mAs is zero...is it possible to work with strings?
Sakis

Hello Flowcode people, I have an issue with a program I'm trying to do, which measure a voltage in the input -1000mV in the input corespond to 1000mA- and also measure the time that voltage applied in ms. The problem is when in simulation it is fine but when I programm the 16F88 and put it on the HP...

Hi Martin, I already order some pics from Farnell, 18f4455 included...Yes I know what to mean, it's like to kill a mosquito with a cannon! But this project is made mostly for educational-kill my time-enjoy e.t.c. so some euros more is not big deal having in mind that I just starting with programming...

Hello Martin,
If you can do will be fine, thanks.I will order from farnel the 18f4455 any way because looked faster! I suppose with the ICD you advise me I can make a board with smd and programming this chip on board, right? So in case of bugs I can reprogramming...
Thank you again Martin!!!

Good morning Martin! It looks grate! I will play with today and put it in a breadboard to test it, but so far so good...Thank you again Martin!
Best regards
Sakis

The problem is not in the Flowcods you made for me but something is wrong whith the development board.A simple programm I did, didn't work also and only in RC mode work(?).
The board is like a christmas tree in RC mode, with all this leds blinking around but dark in HS mode...

Thank you Martin, I compile the last two but I have the 16F877A righ now available and seems not to work even the LCD display. I will buy on Monday an 18F4455 to work with...
Thank you again for your help!!!
Sakis

Hi Martin, I use an HP 488 programmer with 19.66 mHz.
Sakis

Hello Martin, I have to thank you one more time for the time to spent for me! I prefer to use the 16f877 as I already have it but any one would be fine. One more question please... how easy is to read an external 16 bit counter as I'm much better in hardware than is software? The only reason to avoi...

Yes Medelec35 this is what I'm looking after, although it is not working in simulation...Does not reset at all, but I will find out what is the problem. Just a question...the idea with TMR1 in asynchronous mode does not working out? Is that a problem of the flowcode4 or I can't use it at all? Thank ...

Thank you Benj but I want something more(?) easy. I want the number of pulses. I want the TMR1 as a 16 bit (it's better to run as asyncronous) counter waiting for a string of pulses e.g 2000. After these pulses stops just reading the TMR1 and put the number on the LCD. The flowcode you gave me is al...

No, not realy...I want only the amount of pulses witch it's somthing easier I beleive, but it sould be more acurrate as it happens only once and some times for very short time, maybe 50 msec. That's why I want to work with TMR1 in an asynchronous mode. I was look in the Flowcode4 but in the interrup...

Hi, Could you help me useing the TMR1 in asynchronous counder, in order to measure a pulse train no more than 2 secs wide and no more than 20 kHz fast? How I can enable it and read the value after the pulses finished? Thank you!saakis Posts: 1 Joined: Sat Dec 11, 2010 9:50 pm Has thanked: 0 time Hav...