!!! #int rda not works in device !!!

hubble · Joined: 11 Dec 2006 Posts: 10

This is the program "running string"

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

The design of your rda isr is not the best.

You should change it so you only get one character per interrupt.
Don't sit inside the rda isr and wait in a loop to get all the chars.
Also, don't write to the eeprom inside the rda isr.

When you get the "end of string" character (\n), then set a global
flag in the isr code. In the while() loop in main(), you should poll
the global flag. If it's set, then write the buffer to eeprom. Then
clear the flag. This method assumes that there is enough time
between the incoming strings for you to write the entire string to
eeprom, before a new string arrives. Remember, it takes typically
4 ms to write to one byte of eeprom. But the RS-232 characters
come in at a rate of 1 ms per byte. You can't handle two or more
strings coming in quickly, with only a short gap between the strings.
You need enough time to write the string to eeprom.

Also, add the statements shown in bold below:

hubble · Joined: 11 Dec 2006 Posts: 10

Thank For useful advices and explanations. Try to correct mistakes, which you have prompted. But problem appears before receiving bytes.

I try to explain my problems:
1. I use program from this post (COMMENTING #int rda procedure).
2. This is works (in PROTEUS and in working device). I have "running string". This is letter 'я' in russian. In ASCII code - 0xFF='я'.
3. ...
4. I UNCOMMENTING #int rda procedure.
5. This is works in PROTEUS, but NOT works in working device. I until do not receiving bytes through RS232, but line already does NOT run.
6. I have not "running string" in matrix.

rnielsen · Joined: 23 Sep 2003 Posts: 852 Location: Utah

I would suggest you start very basic. This is usually the best thing to do.

Create only a simple main() and a very basic #int_rda() that will capture one character and echo it back to the PC. Once you have that working then try to capture a few characters, one at a time - meaning, enter the ISR, do a getc(), stuff it in an array and then exit the ISR. Do this a few times and then spit the array back out to the PC and see if it's intact.

Once you get this working then build upon that until you get the results you want. It's sometimes best to start extremely basic, doing one thing at a time, and then build upon the successes you have.

Ronald