kermit:How to disable the flow control signals?

kermit:How to disable the flow control signals?

[rick.liu]

Hi,
    I installed c-kermit209 in my linux,and copy the dot.kermrc
in the u-boot0.3.0 to ~/.kermrc,then connect the kermit to my direct
-serral port:

bash>wermit -c
Connecting to /dev/ttyS0, speed 115200
 Escape character: Ctrl-\ (ASCII 28, FS): enabled
Type the escape character followed by C to get back,
or followed by ? to see other options.
----------------------------------------------------
(and then ctrl_\ s)
Device: /dev/ttyS0
Speed 115200
 Terminal echo: remote
 Terminal bytesize: 8
 Command bytesize: 8
 Parity: none
 Autodownload: on
 Session log: (none)
 Carrier Detect      (CD):  On
 Dataset Ready       (DSR): On
 Clear To Send       (CTS): On
 Ring Indicator      (RI):  Off
 Data Terminal Ready (DTR): On
 Request To Send     (RTS): On

here is the question:
1.why the flow control signals are still "on"?
2.if I have a 3-wired smc1/serial port,how to configure
  to turn off RTS/CTS etc.?

Best regards
Thanks !!

Rick


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Re: kermit:How to disable the flow control signals?

[Wolfgang Denk]

In message <20030517131824.39906.qmail@eyou.com> you wrote:
>
>     I installed c-kermit209 in my linux,and copy the dot.kermrc
> in the u-boot0.3.0 to ~/.kermrc,then connect the kermit to my direct
> -serral port:
...
> here is the question:
> 1.why the flow control signals are still "on"?

Because this is what you serial  driver  reports  about  the  current
state of these pins?

> 2.if I have a 3-wired smc1/serial port,how to configure
>   to turn off RTS/CTS etc.?

You already did. The relevant lines from the ~/.kermrc file are:

	set carrier-watch off
	set handshake none
	set flow-control none

To verify, type "show comm" at the kermit prompt:

	Kermit>show comm

	Communications Parameters:
	 Line: /dev/ttyS1, speed: 115200, mode: local, modem: generic
	 Parity: none, stop-bits: (default) (8N1)
	 Duplex: full, flow: none, handshake: none
	 Carrier-watch: off, close-on-disconnect: off
	 Lockfile: /var/lock/LCK..ttyS1
	 Terminal bytesize: 8, escape character: 28 (^\)

The relevant part here is the "flow: none", "handshake: none" and
"Carrier-watch: off" entries.

Best regards,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
Life. Don't talk to me about life.      - Marvin the Paranoid Android

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Re: kermit:How to disable the flow control signals?

[rick.liu]

Dear Wolfgang,

thank you for ur reply,in your message,
======= 2003-05-17 09:29:00 you wrote:=======

>> 1.why the flow control signals are still "on"?
>
>Because this is what you serial  driver  reports  about  the  current
>state of these pins?

i donnot think so,for example,my NO.7 pin(RTS) and NO.9 pin(RI) both connect
to nothing,if your conclusion is correct,RTS and RI should be the same
state.But we
saw they are not the same.

>To verify, type "show comm" at the kermit prompt:

here is my info:

kermit>show comm

Communications Parameters:
 Line: /dev/ttyS0, speed: 115200, mode: local, modem: none
 Parity: none, stop-bits: (default) (8N1)
 Duplex: full, flow: none, handshake: none
 Carrier-watch: off, close-on-disconnect: off
 Lockfile: /var/lock/LCK..ttyS0
 Terminal bytesize: 8, escape character: 28 (^\)

 Carrier Detect      (CD):  On
 Dataset Ready       (DSR): On
 Clear To Send       (CTS): On
 Ring Indicator      (RI):  Off
 Data Terminal Ready (DTR): On
 Request To Send     (RTS): On

Type SHOW DIAL to see DIAL-related items.
Type SHOW MODEM to see modem-related items.

Now we can still see the RTS/CTS/DSR/CD/DTR are still on,why?

it my kermit version's problem?

Best regards,

Rick


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Re: kermit:How to disable the flow control signals?

[Wolfgang Denk]

Dear Rick,

in message <20030517184549.35030.qmail@eyou.com> you wrote:
>
> >> 1.why the flow control signals are still "on"?
> >
> >Because this is what you serial  driver  reports  about  the  current
> >state of these pins?
>
> i donnot think so,for example,my NO.7 pin(RTS) and NO.9 pin(RI) both connect
> to nothing,if your conclusion is correct,RTS and RI should be the same
> state.But we
> saw they are not the same.

Do you really know for sure how thse pins are  internally  connected?
If  there  are  any  pull-up  or -down resistors? And how your UART is
implemented internally? And if the driver actually reads the pins?

I wrote: this is what your  serial  driver  reports.  This  does  not
necessarily  mean  that  this is actually the state of the externally
accessable pin on the serial connector...

> here is my info:

This looks ok.

> Now we can still see the RTS/CTS/DSR/CD/DTR are still on,why?

Because this is what you serial  driver  reports  about  the  current
state of these pins?

> it my kermit version's problem?

No.


Ummm... why do you bother? Is anything not working?

Best regards,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
A Puritan is someone who is deathly afraid that  someone,  somewhere,
is having fun.

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Re: kermit:How to disable the flow control signals?

[rick.liu]

Dear Wolfgang,


======= 2003-05-17 19:07:00 in your message you wrote:=======
>
>Ummm... why do you bother? Is anything not working?
>

Yes,my console still outputs nothing,even not a single word.
So,I must first make sure it's not my console emulator's problem.

As you know,my "big brother" donnot think it's neccessary to port
linux to the board,because we have successfully port vxworks on it before.
So what i am doing can be called private,or something about
personal'interest.
So there is no money for something like BDI.

As u mentioned before,I will read u-boot source,maybe it's a way of continue
my
work.Would u give me a clue of uboot,I mean the sequence of boot and the
according
source file?I didnot find this kind of infomation on the internet.

Best regards

Rick.Liu


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Re: kermit:How to disable the flow control signals?

[Wolfgang Denk]

Hi,

in message <20030518125903.28066.qmail@eyou.com> you wrote:
>
> >Ummm... why do you bother? Is anything not working?
>
> Yes,my console still outputs nothing,even not a single word.

Maybe your target does not output  anything  (at  least  not  at  the
expected baudrate) ?

> So,I must first make sure it's not my console emulator's problem.

Test with a known to work device first.

> So there is no money for something like BDI.

You pay anyway - either with money for the BDI,  or  with  your  time
when you try to do without it.

> As u mentioned before,I will read u-boot source,maybe it's a way of continue
> my
> work.Would u give me a clue of uboot,I mean the sequence of boot and the
> according
> source file?I didnot find this kind of infomation on the internet.

Booting starts at the reset vector, i. e. at _start in cpu/*/start.S

But this is off topic here. Follow-up to u-boot-users, please.


Best regards,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
One does not thank logic.
	-- Sarek, "Journey to Babel", stardate 3842.4

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