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RS232 string data decoding

 
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vortexe90



Joined: 26 Feb 2013
Posts: 30
Location: Algeria

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RS232 string data decoding
PostPosted: Mon Jan 06, 2014 4:25 pm     Reply with quote

How to decode floating data from a data string received in the buffer RS232 receiver in a PIC ?

Data in float transmitted like this one by one:
Code:
12.23\r  54.39\r  234.11\r  1344\r


Data in string received like this one string by one:
Code:
1st string received :   "12.23"
2nd string received :   "54.39"
1rd string received :   "234.11"
1th string received :   "1344"
PCM programmer



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PostPosted: Mon Jan 06, 2014 5:34 pm     Reply with quote

Quote:
Data in string received like this one string by one:

1st string received : "12.23"
2nd string received : "54.39"
1rd string received : "234.11"
1th string received : "1344"

Are these strings in separate arrays ? Are they strings, with a 0x00
byte at the end ? Or, is this just incoming data, sitting in the ex_sisr.c
buffer, and you want to know how to remove it from the buffer ?

If they are in separate arrays, and if they are really strings, which
means they have a 0x00 at the end, then use the atof() function
to convert each ascii string to a float. See the CCS manual about atof().
vortexe90



Joined: 26 Feb 2013
Posts: 30
Location: Algeria

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PostPosted: Tue Jan 07, 2014 8:50 am     Reply with quote

PCM programmer, I transmit these floating data like this:

Code:
    Analog_read();
    printf("%2.2f\r%2.2f\r%3.2f\r%4f\r",analog[0],analog[1],analog[2],analog[3]);


and I receive these data in four separate string like this :

Code:
Void  RDA_isr(void)
{
 gets(value);
}


Data I receive impeccably, but I do not get them identified
gpsmikey



Joined: 16 Nov 2010
Posts: 588
Location: Kirkland, WA

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PostPosted: Tue Jan 07, 2014 10:27 am     Reply with quote

What do you mean by "don't get them identified"? Your code is sending the four values and it looks like you are reading them in correctly. Do you mean you expect some sort of identifier on each string that you read as part of the string?
Are you expecting something like 1st string received : "12.23 Analog 0" or something?

mikey
_________________
mikey
-- you can't have too many gadgets or too much disk space !
old engineering saying: 1+1 = 3 for sufficiently large values of 1 or small values of 3
PCM programmer



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Posts: 20839

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PostPosted: Tue Jan 07, 2014 11:29 am     Reply with quote

Quote:
and I receive these data in four separate string like this :

Code:
Void RDA_isr(void)
{
gets(value);
}


Quote:

Data I receive impeccably, but I do not get them identified


You have this previous recent thread, which you abandoned:
http://www.ccsinfo.com/forum/viewtopic.php?t=51700
In that thread, people answered your questions, but you ignored them.

Temtronic told you to tag the data:
Quote:
temtronic wrote:
also...
you should add a 'tag' like 'V' in front of the voltage reading, and 'C' for current when you send the data stream.

You agreed to do it. But then in this new thread, you have not done it.

Ttelmah told you not to use gets() in #int_rda, but you are still doing it:
Quote:
Ttelmah wrote:
You are off to a 'wrong' start by using gets, in INT_RDA


Just because you start a new thread, we don't forget the previous thread.
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