RS232 read data from buffer

[nicotec]

Hi, I need help about reading data from serial:

[Wayne_]

Some issues.

Using code tags is good but only if you indent your code in the first place.

strtok returns a pointer to a string.
ptr is defined as a pointer char *ptr; This is OK
cmd and val are ints.
int cmd;
int val;

cmd = ptr; is wrong but seems to work!
The sam ewith val=ptr;

you need to define cmd and val as char *.
char *cmd, *val;

Now for the problem.

gets(string);
Won't work within the interrupt routine!
#int_RDA will interrupt when there is a single character in the input buffer. You read this and store it.

Where are you getting the info from ?

[Ttelmah]

Understand one thing.
INT_RDA, implies that _one_ character (just one, not a string, not a command etc. etc.,), has been received, and is available to read.
Your RDA handler, wants to receive just this one character, or you might as well not use the interrupt at all, but just sit in the main and receive the string.
Look at ex_sisr, for an example of what the handler should do.

Best Wishes

[nicotec]

I written a vbcode which send to serial port some command like "55,1" or "4,3" ended with LF and CR.
Now I need to read these command to do high state some pin
I wish to use interrupt because it's important the execution of the command, since normally (using do while(true)) my code read analog input and sending to serial port read value.

In Alternative:
If I use gets() in do-while loop the program stop to work, waiting for data, while I wish to continue if no string available for about 250ms.

I hope You can help me to find a solution.
Thanks and regards.

[Ttelmah]

Look at ex_sisr.
All you do, is in your main, as it loops, you check if a character is in the buffer. If it is, read it, and check it against the next expected value in your string. When you reach the last character do what you want at this point.

Best Wishes

[nicotec]

Hi, I still not solved my problem since if I send a character, I cannot receive it; see below:
sending with HyperTerminal, receiving with c=getc and resending what received but different
send "A" corresponding ƒ
send "B" corresponding †
send "C" corresponding ‡
send "D" corresponding Œ
send "E" corresponding 

Related code is:

[nicotec]

sorry, probably I have found matter regarding baud rate too high for pic24 using inosc 8MHz; I will post if confirmed or not, here.
Thanks