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pratik
Joined: 13 Oct 2005
Posts: 55
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 Posted: Mon Jan 07, 2008 4:07 pm Post subject: Rx/Tx problem |
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Hi,
I want to send 5 values from one micro controller to other through serial communication
TX----------------
$regfile = "89s2051.dat"
$crystal = 8000000
$baud = 2400
Config Debounce = 30
Dim Rx(10) As Byte
Rx(1) = 10
Rx(2) = 20
Rx(3) = 30
Rx(4) = 40
Rx(5) = 50
Do
Debounce P1.4 , 0 , Key , Sub
Wait 1
Loop
Key:
Printbin Rx(1) ; Rx(2) ; Rx(3) ; Rx(4) ; Rx(5)
Return
RX-------------
$regfile = "m8515.dat"
$crystal = 8000000
$baud = 2400
Config Lcdpin = Pin , Db4 = Portc.4 , Db5 = Portc.5 , Db6 = Portc.6 , Db7= Portc.7 , E = Portc.3 , Rs = Portc.2
Config Lcd = 16 * 2
Cls
Do
inputbin Rx(1) , Rx(2) , Rx(3) , Rx(4) , Rx(5)
Locate 1 , 1
Lcd Rx(1) ; " " ; Rx(2) ; " " ; Rx(3) ; " " ; Rx(4) ; " " ; Rx(5)
Loop
End
The problem is I am not able to receive the correct data
Need help |
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rileyesi
Joined: 19 Dec 2006
Posts: 398
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| Posted: Mon Jan 07, 2008 7:22 pm Post subject: |
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Hi,
| Quote: |
$regfile = "89s2051.dat"
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You might be in the wrong section. I don't think think this is an AVR chip!
However, to answer your question from an AVR view, I convert my data to a string variable and simply use the PRINT command on the transmitter side. On the receiver side, I do the following:
| Code: |
While Inkey() <> "$"
Wend
Input Sdata
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I add the $ symbol to my data at the transmitter. That way, the receiver knows where the start of the data package is.
Hope this helps.
Pete |
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pratik
Joined: 13 Oct 2005
Posts: 55
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| Posted: Mon Jan 07, 2008 7:45 pm Post subject: |
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hi,
thanks
i will try |
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pratik
Joined: 13 Oct 2005
Posts: 55
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| Posted: Tue Jan 08, 2008 8:37 am Post subject: |
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hi,
TX------------
Dim Sdata As String * 10
sdata= "1020304050"
do
print sdata
wait 1
loop
RX------------
Dim Sdata As String * 10
cls
lcd" start"
wait 1
do
While Inkey() <> "$"
Wend
Input Sdata
cls
lcd sdata
loop
As per your suggestion
But the lcd screen is blank
I connected TX to PC com port I receive $ & 1020304050
Any new suggestion because I want to send 5 nos of bytes which is not same at all the time |
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Arera
Joined: 23 Sep 2007
Posts: 386
Location: Wuppertal, Germany
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| Posted: Tue Jan 08, 2008 3:15 pm Post subject: |
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Here´s a great tool to whatch the communication on the serial interface. I found it very helpful to solve communication problems.
http://www.docklight.de/download.htm
You only need to build an adapter-cable and maybe add some com-ports to your PC, then watch all the data trnsmission from both partners. |
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rileyesi
Joined: 19 Dec 2006
Posts: 398
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| Posted: Wed Mar 26, 2008 4:41 pm Post subject: |
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Hi,
Sorry for the delay of my response.
For this to work, you have to include the $ symbol in your data. Modify your post to the following:
| Code: |
Dim Sdata As String * 11
sdata= "$1020304050"
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Note that if your transmitter stops sending data, the receiver will be stuck in the loop forever. If this is a potential problem for you, you will need to add a counter, or something, to exit. Let me know if you need me to explain further.
Hope this helps.
Regards,
Pete |
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rileyesi
Joined: 19 Dec 2006
Posts: 398
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| Posted: Wed Mar 26, 2008 5:04 pm Post subject: |
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Hi,
I want to ammend my previous post.
Keep the TX statement the same and add the $ symbol to your print statement.
| Code: |
TX------------
Dim Sdata As String * 10
sdata= "1020304050"
do
print "$";sdata
wait 1
loop
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Hope this helps.
Pete |
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Beke
Joined: 14 Feb 2008
Posts: 45
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| Posted: Wed Mar 26, 2008 6:25 pm Post subject: |
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Hi rileyesi
There is a small problem with the way you suggest (to use the Print command), and this is the following: if you want to transmit all sort of data, among them the 0 value, you cannot transform this to a character string, because there is no character corresponding to the zero value (abstractly spoken, there is: the "null" character, i.e.nothing.) For this reason, the use of printbin/inputbin is necessary. This means only a small change in your code. |
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rileyesi
Joined: 19 Dec 2006
Posts: 398
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| Posted: Wed Mar 26, 2008 6:39 pm Post subject: |
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Hi,
I have used this in system that have been running for years communicating using RF MODEMs and the data includes zeros. This also works if the boards are connected directly with a serial cable, you just have to use a null MODEM.
To be more specific, I have 4 data points that I need to send at the same time. Also, I want the data length to be the same each time, so I force a zero when it is needed (for example, 123 will be sent as 0123).
Here is a code snippet:
| Code: |
Astring = Str(a(1))
Astring = Format(astring , "0000")
Bstring = Str(a(2))
Bstring = Format(bstring , "0000")
Cstring = Str(a(3))
Cstring = Format(cstring , "0000")
Dstring = Str(a(4))
Dstring = Format(dstring , "0000")
Print "$" ; Astring ; Bstring ; Cstring ; Dstring
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Where Astring, etc. are DIMed as strings and A(x) is a integer array. This results in a 17 digit data packet each PRINT command and it starts with a $ sign.
At the receiver side, I tear the string back into the origonal four data points. (i.e. 0123 equals 123).
To be honest, I got this method either here or (more likely) from the old BASCOM e-mail ring. I like to give credit where credit is due!
Hope this helps.
Pete
EDIT: Added additional thoughts
There are other ways of data transfer, I am sure. One that comes to mind (but I have never used it) is using data delimiters. For example, you can separate your data using a comma and then your receiver will know where the data ends and the next one begins.
I am sure that there are much more qualified people here who could expand on this idea. |
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Beke
Joined: 14 Feb 2008
Posts: 45
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| Posted: Wed Mar 26, 2008 9:06 pm Post subject: |
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Hi,
to be more clear what I was speaking of here is this code snippet, run it in simulation:
| Code: | Dim A As String * 5
A = Chr(65) + Chr(66) + Chr(67) + Chr(0) + Chr(68)
Print A
Print Len(a)
End |
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rileyesi
Joined: 19 Dec 2006
Posts: 398
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| Posted: Wed Mar 26, 2008 10:29 pm Post subject: |
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Hi,
I got your point from your first post. That is why I did my program the way I did! I needed to have an RS-232 communications link and I don't think PRINTBIN would work.
I hope this helps the origonal poster!! If not, let us know.
Regards,
Pete |
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