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andro
Joined: 12 Mar 2007
Posts: 94
Location: Ljubljana
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 Posted: Wed Dec 16, 2020 6:27 pm Post subject: Serialin buffer |
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Hi!
Serialin buffer Max. length iz 255 Bytes.
Is there a way to make it bigger?
Br
Andrej
(BASCOM-AVR version : 2.0.8.3 ) |
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hgrueneis
Joined: 04 Apr 2009
Posts: 902
Location: A-4786 Brunnenthal
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| Posted: Wed Dec 16, 2020 7:04 pm Post subject: |
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Do you know HELP?
Juast loock up Config Serialin!
Regards Hubert |
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andro
Joined: 12 Mar 2007
Posts: 94
Location: Ljubljana
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| Posted: Wed Dec 16, 2020 7:39 pm Post subject: |
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Hubert, you are so kind. Please Look by yourself, and let me know, what "help" says about Max. buffer length.
Thanks. |
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MWS
Joined: 22 Aug 2009
Posts: 2262
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| Posted: Wed Dec 16, 2020 8:25 pm Post subject: Re: Serialin buffer |
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| andro wrote: | | Serialin buffer Max. length iz 255 Bytes. |
The help tells:
| Quote: | Size
A numeric constant that specifies how large the input buffer should be. The space is taken from the SRAM. The maximum is 255. |
As you write exactly the same as the help tells, somehow you must not understand what you write.
Tell us exactly which one from the words you wrote you do not understand.
If you've succeeded to manage that, you may also understand:
| Quote: | CONFIG SERIALIN
....
The following internal variables will be generated for UART0:
_RS_HEAD_PTR0 , a byte counter that stores the head of the buffer
_RS_TAIL_PTR0 , a byte counter that stores the tail of the buffer.
_RS232INBUF0 , an array of bytes that serves as a ring buffer for the received characters.
_RS_BUFCOUNTR0, a byte that holds the number of bytes that are in the buffer. |
that these variables are all bytes, or an array of bytes. A byte can hold values from 0 to 255, this applies the same for _RS_BUFCOUNTR0, which holds the number of bytes in the buffer at runtime.
| Quote: | | Is there a way to make it bigger? |
Sure.
Options are:
1) Throw enough money after Mark and you will get your special version.
2) Write your own buffered input, the disadvantage is: you can not use Bascom's standard input functions.
3) Describe your exact problem and after we have found out that your demand is in reality utter nonsense and not required at all, you can save 1), and 2), and additionally lots of time and expenses.
No need to thank me for this advise, you're welcome. |
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andro
Joined: 12 Mar 2007
Posts: 94
Location: Ljubljana
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| Posted: Wed Dec 16, 2020 10:21 pm Post subject: |
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What I do not understand is, What's wrong with both of You...?
A have never encountered such rude answers, not at this Forum, neither at some other.
Conversation with you 2 completed. |
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Evert :-)
Joined: 18 Feb 2005
Posts: 2156
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| Posted: Wed Dec 16, 2020 10:41 pm Post subject: |
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Hi Andre,
Here the nice guy from Holland. 
It's not that easy to increase the receiver buffer. The data and pointers of the receive buffer are now stored in bytes. Bytes can hold up values to 255.
To increase the buffer size you need to change all those bytes variable to word variable in the librarys and that's a lot of work. And because you are the first that encounters this problem the priority to change this is low.
Low as in close to zero.
I'm working myself now 25 years with Bascom and had never a problem with a to small receive buffer.
If your buffer of 255 bytes is to small then you are not processing the data fast enough or something else is going wrong.
Maybe you can tell us what kind of data you try to handle that requires that big buffer.
You can always design your own ring buffer that can hold more data. Have a look at $SERIALINPUT to capture the received data and do something with it.
_________________
www.evertdekker.com Bascom code vault |
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MWS
Joined: 22 Aug 2009
Posts: 2262
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| Posted: Thu Dec 17, 2020 6:45 pm Post subject: |
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| andro wrote: | | What I do not understand is, What's wrong with both of You...? |
Nothing is wrong beside your lack of understanding,
I've presented a few feasible solutions and you're still that taciturn not to describe why you think to need an oversized buffer,
If the manual of your car tells you, max speed is 120mph, then you think you can ask a forum how to get it go double as fast, while you don't even tell why.
And then you expect specialists to take you by the hand to teach you all sorts of engine tuning?
LOL, in what fantasy world you're living?
Give, and it shall be given unto you.
You gave what?
Nothing, beside quoting the help.
I had at least the decency to give you some hints, and all you ingrate was able is to ask what's wrong with me.
So what's wrong with you?
Evert  wrote: | | Have a look at $SERIALINPUT |
Interesting. Missed that.
Thanks. |
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hgrueneis
Joined: 04 Apr 2009
Posts: 902
Location: A-4786 Brunnenthal
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| Posted: Thu Dec 17, 2020 9:09 pm Post subject: |
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andro,
I rather think, there is something wrong with you than us,
if you can not read the 'Help' and be fine with it.
If I were you, I would not ask again.
Nobody was rude, just realistic!
And if you are so arrogant, why ask at all?
Regards
Hubert |
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albertsm
Joined: 09 Apr 2004
Posts: 5922
Location: Holland
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| Posted: Thu Dec 17, 2020 9:56 pm Post subject: |
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covid is nasty as it is. so lets do an extra effort here to remain calm. i do not have much time to look after heated threads.
just with all communication it is a matter of interpretation.
i think the TS read the help and knows about the max size. so i consider this a normal question.
it all depends on what TS has in mind.
do you want to know if there is a setting, or some special lib or are you looking for some code?
there is no built in way. because of the overhead and because one can best use HW handshake.
But when there is a need for a big buffer it is not so hard to create one yourself.
Just as with support it is important to give as much details as possible.
_________________
Mark |
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JC
Joined: 15 Dec 2007
Posts: 586
Location: Cleveland, OH
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| Posted: Fri Dec 18, 2020 4:35 am Post subject: |
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One approach that often works, as mentioned already, is to simply use a small buffer and have a routine that reads its data and puts it into a large que / array / circular buffer, (your code), from which the remainder of the program then draws the data as needed.
That can be done with polling, receive interrupts, timed interrupts, the event system, etc.
JC |
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andro
Joined: 12 Mar 2007
Posts: 94
Location: Ljubljana
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| Posted: Sun Dec 20, 2020 5:55 pm Post subject: |
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Hi,
The problem is in a demand, to send HTML POST to a WEB server, using ESP8266. It's everything fine, but server returns a burst of around 400byte, in case of Error404 even more.
Baudrate is 115200. This burst is faster then I'm able to empty the serialin buffer. I did my own 'serialin, that looks like this:
| Code: |
'***************** UART5 interrupt ESP8266 ********************************************************
On Usarte1_rxc Rx_int6
Enable Usarte1_rxc , Hi
'**************************************************************************************************
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Sure; I enable interrupts, since Ialso us timer:
| Code: |
' _____ ___ __ __ _____ ____
' |_ _||_ _|| \/ || ____|| _ \
' | | | | | |\/| || _| | |_) |
' | | | | | | | || |___ | _ <
' |_| |___||_| |_||_____||_| \_\s
'*************************************************************************************************
'********************** TIMER CONFIG *************************************************************
Config Tcd0 = Normal , Prescale = 64
Tcd0_per = 5000 'period: __ms;
'*************************************************************************************************
On Tcd0_cca Compared0_int
Enable Tcd0_cca , Lo
'*************************************************************************************************
'*************************************************************************************************
Enable Interrupts
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TIMER ISR:
| Code: |
'************************************************************************************************************************
'************************************************************************************************************************
'************************************************************************************************************************
'************************************************************************************************************************
' _____ ___ __ __ _____ ____ _ ___ ____ _____
' |_ _||_ _|| \/ || ____| / ___| | | |_ _|/ ___|| ____|
' | | | | | |\/| || _| \___ \ | | | || | | _|
' | | | | | | | || |___ ___) || |___ | || |___ | |___
' |_| |___||_| |_||_____| |____/ |_____||___|\____||_____|
'************************************************************************************************************************
'************************************************************************************************************************
'************************* ČASOVNA REZINA 10ms *************************************************************************
Compared0_int:
Tcd0_intflags.0 = 1
Gosub Serial_check6 'ESP8266
Return
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| Code: |
'(
____ _____ ____ ___ _ _ ____ ___ __ __ __
/ ___|| ____| _ \|_ _| / \ | | / ___/ _ \| \/ | / /_
\___ \| _| | |_) || | / _ \ | | | | | | | | |\/| | | '_ \
___) | |___| _ < | | / ___ \| |___ | |__| |_| | | | | | (_) |
|____/|_____|_| \_\___/_/ \_\_____| \____\___/|_| |_| \___/
')
'ISR COM6 (ESP8266)
Rx_int6:
'Toggle Led1
If Volume6 = 3500 Then
Goto Skip_full6
End If
Incr Volume6
Incr Head
If Head > 3500 Then
Head = 1
End If
Sbuf6(head) = Usarte1_data
Skip_full6:
Return
'*******************************************************************************
' ESP8266
'find a message - 0x0A as end of message; call from TIMER ISR
Serial_check6:
If Msg6 = 1 Then
Goto Receive_end6
End If
If Volume6 = 0 Then
Goto Receive_end6
End If
If Tail = 0 Then
Incr Tail
End If
Com6_s = Chr(sbuf6(tail)) 'read from buffer
Decr Volume6
Incr Tail
If Tail > 3500 Then
Tail = 1
End If
If Com6_s = Chr(10) Then 'is there a LF ?
If Com6_n = 0 Then 'if LF is the first character, then drop the packet
Stringx6 = ""
'Incr Com2_err
Goto Serial_check6
Else 'LF is at the enda; message OK
Com6_n = 0
Msg6 = 1 'set Msg6 flag
String_main6 = Stringx6 'copy message to main string var.
Goto Receive_end6 'pazi da v main najprej obdelaš main string, preden resetiraš MSG flag!!??
End If
End If
'***************** any character received ********************
If Com6_n = 0 Then 'if Com_n = 0 this is first character
Stringx6 = ""
Stringx6 = Stringx6 + Com6_s
Incr Com6_n 'incr Com_n
Else
If Com6_n > 3500 Then 'check the length
Com6_n = 0
'Incr Com2_err 'if to long, inc error count
Stringx6 = ""
Goto Serial_check6 'continue
Else
Incr Com6_n 'length is OK,
Stringx6 = Stringx6 + Com6_s 'add received char.
Goto Serial_check6 'continue
End If
End If
Goto Serial_check6
'**********************
Receive_end6:
Return
'==========================================================================
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Msg6 is a variable, that gives the main loop the information, that there is a message in a String_main6 variable.
You can see, if I'm not fast enough, Msg6=1 blocks emptying the buffer. That's whay original 255 bytes is not enough.
The code works, but sometimes in my buffer reamins some bytes, that can not be used.
Therefore, I went back to Basom serialin buffering, including CTS/RTS controll.
I'm able to pause ESP8266, however, now the serialout buffer seems not to be working right.
With external serial monitor I can see, that Xmega sends wrong POST message to ESP - only one byte is always wrong - actualy, it is replaced by 0x08 (bacspace).
The post messsage is like this:
| Code: |
Content_txt = "<mm><ci>" + Card_id_txt + "</ci><ii>" + Item_id_txt + "</ii><dkey>" + Device_key_txt + "</dkey><cd>05.09.20</cd><ct>21:49:30</ct></mm>"
'string2 115
If Content_length > 99 Then
Print #6 , "AT+CIPSEND=115"
Else
Print #6 , "AT+CIPSEND=114"
End If
Waitms 5
Print #6 , "POST /mm/service/service1.ashx?cmd=save_event HTTP/1.1" 'http://___.si/mm/service/service1.ashx
Print #6 , "Host: ___.si"
Print #6 , "Content-Length: " ; Content_length_txt
Print #6 , "Expect: 100-continue"
Print #6 , ""
Waitms 30
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Sent to ESP (external monitor):
41 54 2b 43 49 50 53 45 4e 44 3d 31 31 34 0d 0a AT+CIPSEND=114..
50 4f 53 54 20 2f 6d 6d 2f 73 65 72 76 69 63 65 POST /mm/service
2f 73 65 72 76 69 63 65 31 2e 61 73 68 78 3f 63 /service1.ashx?c
6d 64 3d 73 61 76 65 5f 65 76 65 6e 74 20 48 54 md=save_event HT
54 50 2f 08 2e 31 0d 0a 48 6f 73 74 3a 20 62 6e TP/..1..Host: bn
74 2e 73 69 0d 0a 43 6f 6e 74 65 6e 74 2d 4c 65 t.si..Content-Le
6e 67 74 68 3a 20 38 38 0d 0a 45 78 70 65 63 74 ngth: 88..Expect
3a 20 31 30 30 2d 63 6f 6e 74 69 6e 75 65 0d 0a : 100-continue..
0d 0a
Bold 0x08 is wrong! It shoulbd be 0x31.
I know, code above is rather 'confusing'. It was actualy made a few years ago, since I was not able to receive 0x00, using original Seriallin.
But it works fine if messages are shorter then 255B.
Any idea?
Do You suggest to use SAVEALL with Usarte1_rxc ISR? Or to PUSH / POP some particualr registers?
A DMA 'transferr' might be an option, but I'm somehow avoiding DMA (lack of understanding).
Thanks in advance.
Andrej |
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MWS
Joined: 22 Aug 2009
Posts: 2262
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| Posted: Sun Dec 20, 2020 8:09 pm Post subject: |
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| andro wrote: | | Baudrate is 115200. This burst is faster then I'm able to empty the serialin buffer. |
Then your code is too ineffective.
115200 Baud are, with start and stop-bit, 11520 bytes per second, assuming the XMega runs with 32MHz, you have 32000000 / 11520 = 2777 cycles to handle one received byte.
This is easily feasible, but not with your code.
For example, such actions:
| Code: | Stringx6 = Stringx6 + Com6_s |
are costly in terms of cycles, especially if Stringx6 is already longer.
Bascom uses zero-terminated strings, a string does not know it's length, thus in above code Bascom needs to search through the string, byte by byte, till it finds the terminating zero.
Then Com6_s is written into the place of the zero and the next byte becomes the zero terminator.
Let's say you have already 300 bytes in Stringx6 and machine code: load, compare and jump takes 5 cycles, then you have wasted 1500 of your 2777 cycles in above command, only for searching the string's end.
Your other code needs also some cycles.
To speed this up, do an Overlay over the string, dimension a string-index, then address the array with index, save the byte, increase index, write terminating zero.
Or keep everything within the income-buffer, only check for message-end. If end is reached, use a fast routine to copy from buffer- to target-string.
This will cost less. For the rest of the code, I can not imagine that I'd use a timer for this. |
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andro
Joined: 12 Mar 2007
Posts: 94
Location: Ljubljana
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| Posted: Sun Dec 20, 2020 8:23 pm Post subject: |
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Hi MWS
Huh, I would newer thougth, this pice of code takes so many cycles. Thanks for this. I apriciate your hint, how to handle this problem other way.
In this app, I'm only doing with ascii, so the 0x00 will never ocure, thus, I can only look for the <LF> at the end and quick copy from the buffer.
Regarding time slicing - the exact timing is crucial in my application . Some events must repeat at exact time period. I have posted only a small part of the code.
BR
Andrej |
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enniom
Joined: 20 Oct 2009
Posts: 537
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