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I pointed out the poor decoupling early on in the thread.....

I forgot to tell you thank you Ttelmah. I had stuck on keypad scanning and ISR part of the code but the problem, as you mentioned, was ...

Dear All,

I have found the problem finally and get the project worked!
The problem was not about the software, it was about hardware! During test the board, I have always used my USB port with RS ...

thank you so much for your advices, but still I couldn't solve the problem!

I have tried what you advices me and here is the summarize what ı have done;
- I re-organised the whole code and made ...

One thing that leaps out on the circuit, is you show the RS232 connector (DB9), going to the PIC directly, instead of to the MAX232 where it needs to go. Duh.
Then with the RS232 interrupt enabled, t ...

Classic ISR 'problem'.

ALL Interrupt Service Routines(ISR) MUST be short and fast !!

They must NOT contain any 'math' or 'string' functions or calculations !
They must NOT contain any delays ( ...

Hello dear forum members,

I am trying to make office entry recording system by using keypad and communicating via rs232 with host pc. I have partially completed the main part, and it is working wel ...

thank you so much Ttelmah. I have tried your advice and got the result well.

Hello, I need help to understand what is the main reason CCS C put extra value when I try to send string by using fputs via rs232 connection. the code belock is below

...

You are right Jay, sorry. here is the second code..
#include <16F628A.h>
#FUSES NOWDT,NOPROTECT, NOBROWNOUT, NOLVP,NOCPD
#FUSES INTRC_IO
#use fast_io(a)
#use delay(internal= ...

Hello, I have been trying to generate SPWM by using Timer1 for two output pins of 16f628a. Actually, I find and optimize this code and test it on real board. It worked well for me.
#include <16f ...

With your advice, I tried to generate pwm by using timer1. Please check the following. Actually, this code works well in Proteus but in real, this does not work. I mean I can not control the pic and I ...

Thank you for reply Ttelmah. what I learned from your refer's topic is that the way to do SPWM is to make many ON/OFF succecivelly in microseconds and we can fading the LEDs by changing their internal ...

thank you for reply Mike, yes I try to do real hardware but for some test and improvement, I make the ISIS file simple. my last post for sim6() is just to see whether I achieved PWM or not, If I had d ...

I think I was misunderstood here. I used two pics because I made Rf communication between 2 pics via RS232 (433 MHz TX-RX device).
this was my mistake because I forget to delete diodes before uploadi ...

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you can see my project for better understanding. Is there a way to connect all ...