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suibaf
Joined: 03 Oct 2004
Posts: 32
Location: Lecce
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 Posted: Sat Apr 05, 2014 6:29 pm Post subject: receive on Uart |
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Hi,
Enviroment work: arduino2560 R3, Bascom avr 2077.
I connected 2560 and pc with rs485. I have Uart1 with buffer:
| Code: | Config Serialin1 = Buffered , Size = 100 , Bytematch = All |
and the right interrupt:
| Code: | 'Label called when UART receives a char
Serial1bytereceived:
While Ischarwaiting(#2) > 0 'while there are bytes in the buffer
A = 0
A = Inkey(#2)
Print #2 , A
Waitms 10
Wend
Return |
The problem is that when I send from terminal 1 byte es: 5D, it answer with 5D (93). But if I send 5D 5D, it answer with value that i don't understand.
Please, can you explain me waht happen?
Best Regards
(BASCOM-AVR version : 2.0.7.7 )
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MWS
Joined: 22 Aug 2009
Posts: 1827
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| Posted: Sat Apr 05, 2014 9:10 pm Post subject: Re: receive on Uart |
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| suibaf wrote: | | Please, can you explain me waht happen? |
Improper use of the buffered routine and improper use of the ISR-extension Serial1bytereceived.
Bascom contains samples, which show proper use. |
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Visovian
Joined: 31 Oct 2007
Posts: 584
Location: Czech
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| Posted: Sun Apr 06, 2014 8:04 am Post subject: |
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It seems to me rather reasonless first to make an input buffer an then try to do something after each byte received.
You need no bytematch in your code.
| Code: | Config Serialin1 = Buffered , Size = 100
Enable Interrupts 'needed for buffered serial
Do
If Ischarwaiting(#2) = 1 Then 'if there is a byte in the buffer ;;;; Edit: "Then" added
A = Inkey(#2)
Print #2 , A
End If
Loop
End |
(According to Bascom help example.)
Last edited by Visovian on Sun Apr 06, 2014 11:22 am; edited 1 time in total |
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suibaf
Joined: 03 Oct 2004
Posts: 32
Location: Lecce
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| Posted: Sun Apr 06, 2014 9:52 am Post subject: |
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Inkey no work in my case because i have zero value on transmission. (According to Bascom help)
And, i have tested your code but no work. In my opinion because i have RS485, timing problem may be. Now i have found a solution but i have problem with printbin. I explain:
| Code: | Printbin #2 , Rcv_buff(1) ; Num_byte |
Num_byte = 7, but printbin send on serial all array.
If I replace num_byte with 7 it work perfectly. Is it not possible to pass to printbin a variable that specify number byte?
Thanks and best regards[/quote]
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Visovian
Joined: 31 Oct 2007
Posts: 584
Location: Czech
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| Posted: Sun Apr 06, 2014 11:18 am Post subject: |
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| Quote: | | Is it not possible to pass to printbin a variable that specify number byte? |
You can use for example
| Code: | For I = 1 To Num_byte
Printbin Rcv_buff(i) ; 1
Next
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suibaf
Joined: 03 Oct 2004
Posts: 32
Location: Lecce
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| Posted: Sun Apr 06, 2014 11:42 am Post subject: |
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Yes that is a solution!
But why it no possible topass to printbin the number of byte with a variable? And if it is no possible, why Bascom does not warn?
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Visovian
Joined: 31 Oct 2007
Posts: 584
Location: Czech
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| Posted: Sun Apr 06, 2014 12:12 pm Post subject: |
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| Quote: | | But why it no possible topass to printbin the number of byte with a variable? |
Simply because Bascom cannot do everything that comes to one's mind.
Bascom supposes (just like the other languages) that user will himself write nonincluded functions.
| Quote: | | if it is no possible, why Bascom does not warn? |
But it is clearly described in Bascom-help:
PRINTBIN
...
The number of bytes to send can be specified by an additional numeric parameter. |
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Visovian
Joined: 31 Oct 2007
Posts: 584
Location: Czech
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| Posted: Sun Apr 06, 2014 1:07 pm Post subject: |
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| Quote: | | if it is no possible, why Bascom does not warn? |
If you ask why a compilation error is not reported, it is because there is no syntax error.
| Code: | Printbin #2 , Rcv_buff(1) ; Num_byte |
It is a valid code. It means:
Printbin whole array Rcv_buff() , then Printbin value of variable Num_byte. |
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suibaf
Joined: 03 Oct 2004
Posts: 32
Location: Lecce
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| Posted: Sun Apr 06, 2014 2:42 pm Post subject: |
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Visovian, thank you very mach for your help!
Best Regards
Fabio
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Visovian
Joined: 31 Oct 2007
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| Posted: Sun Apr 06, 2014 3:55 pm Post subject: |
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| Good Luck! |
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AdrianJ
Joined: 16 Jan 2006
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suibaf
Joined: 03 Oct 2004
Posts: 32
Location: Lecce
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| Posted: Tue Apr 15, 2014 10:40 am Post subject: |
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In Bascom help, config serialin there is:
When using the BYTEMATCH option, you must preserve the registers you alter.
What does it mean? Can you explain me please?
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albertsm
Joined: 09 Apr 2004
Posts: 5069
Location: Holland
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| Posted: Tue Apr 15, 2014 9:09 pm Post subject: |
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the buffered routines are interrupt driven. only the used registers are saved. the bytematch was just intended to set some flag so a user known that some data was received.
in such a case you do not need to do a thing.
but some write complete apps inside this byte match interrupt which destroys registers which are not saved. in such a case, use pushall/popall to make sure you do not destroy regs during the interrupt.
and remember : keep the time in the byte match small since otherwise you might miss data.
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