Capture and compare serial data

[Dennis]

@ Dave

OK cool

So I Will
1. Capture all 4 lines into and array each one is 4 bytes and a checksum byte so array needs to receive 20 bytes total.
2. Check 4 for checksum match
Continue on ...

It certainly seems doable and will give it a bash right away!

Still just wondering if there is a way to capture and compare all 4 lines

Kind regards
Dennis

[mackrackit]

If you really want to do each line then I guess the way would be ...

IF array1 bit1 = array2 bit1 then
IF array1 bit2 = array2 bit2 then
IF array1 bit3 = array2 bit3 then
......on and on and on....

But something like Charles said
IF check1 = check2 then
IF check2 = check3 then
IF check3 = check4 then
Hey. it is done...

[Charles Linquis]

Depending on what your data looks like, you can also do some neat things with:

ARRAYREAD (name_of_first_string),(nocompare_location),(numbe r_of_chars_to_compare),[WAITSTR name_of_second_string]

[Dennis]

AHA...

That's where I'm stuck ....at step 1 I mentioned earlier ...

1. Capture all 4 lines into and array each one is 4 bytes and a checksum byte so array needs to receive 20 bytes total.

I this is the line I am using to receive the data

DEBUGIN [WAIT(SYNK),WNUM,XNUM,YNUM,ZNUM,CHECKSUM]
           ' wait for SYNK, when received store next 4 bytes in variables WNUM,XNUM,YNUM,ZNUM
           'then send these to hyperterminal or serial program or wherever

What must be changed in order for me receive it 4 times and build the array?

I was playing around with this as a start..but it's here where I am stuck!

For counter=0 To 19 
DEBUGIN [WAIT(SYNK),WNUM,XNUM,YNUM,ZNUM,CHECKSUM]
           ' wait for SYNK, when received store next 4 bytes in variables WNUM,XNUM,YNUM,ZNUM
           'then send these to hyperterminal or serial program or wherever 
         counter=counter+1
        Next

As always any help would be appreciated

Kind regards

Dennis

[aratti]

Hi Denis, I think you could take some advantage from this thread :http://www.picbasic.co.uk/forum/showthread.php?t=12870
In post # 4 DT is giving an interesting snippet for having 2d array in PBP.

I don't know if you have already used bi-dimensional arrays, if not let me say that they could easy your compare problem.


You cannot corrupt the variable within a FOR/NEXT cycle:

For Counter =0 to 19
.
.
.
counter=counter+1
Next Counter

You should expect some problem from this code!

Al.

[Dennis]

@ Charles ..thanks a million for the tips will check them out as soon as I have the array(s) built up.

@ Al .. Thanks for the tip there , has me wondering how I can put the 2D array to use for my a solution.

I am guessing as a start I should replace the DEBUG sommand with something like serin2 and build the array with one command ?
Something like :

SerIn2 GPIO.4,T2400,500, main,[WAIT(SYNK),STR DATAIN\4]

This would indeed create an array and store the 4 bytes and the checksum byte.
But again I want to to do this 4 times and have either one array with the contents of each time OR I could try have 4 different arrays (one created for each time) and then check the checksum values for each array.

Now I am wondering if I am doing the right thing , perhaps I should rather have more SYNK/qualifier bytes and send and receive one instance of the data and checksum that.
Problem is that sometimes some corruption occurs at the receiver side so to solve this I thought it best to send more instances of the same data.

Any more suggestions are welcome

Kind regards

Dennis

[mackrackit]

Here is something else if you want to go the route of sending "good" data the first time.
You might be able to get an idea or two... or more confused
http://www.picbasic.co.uk/forum/showthread.php?t=12554

[Ioannis]

Another one idea is to have the 3rd string stored in an array and then on the 4th reception compare in the serial input that string using the wait modifier
like this:

debugin [str my_array\4]

and then

debugin [waitstr my_array\4]

I'll try to put up an example soon. I got to go now... sorry

Ioannis