Re:Re: About rs232 on motorola mpc8260 ads board

Re:Re: About rs232 on motorola mpc8260 ads board

[zzh]

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>
>----- Original Message -----
>From: zzh <david-1z@263.net>
>To: <linuxppc-embedded@lists.linuxppc.org>
>Sent: Wednesday, March 22, 2000 4:28 PM
>Subject: About rs232 on motorola mpc8260 ads board
>
>
>>
>> Hello,everyone.
>> I'm trying to make the SCC1 drived rs232 port of a motorola
>> mpc8260 ads board work.The manual says it can direct connect
>> to pc com port.But it seems the output from this board is not
>> rs232 voltage.i.e -3 to -12 for logical one,3 to 12 for logical
>> zero,nor is it TTL,it seems that it use 0 for logical 1,5.0v for
>> logical 0,so it is rather annoying. I have to invert the output
>> from 8260 ads,then use a TTL->232 converter to connect with PC,
>> it works when i send char from 8260,but cannot work in the
>> other direction.
>> In addition,for a while,it output 232 signal,but i cannot
>> reproduce it!!
>> Does anyone has experience with this board?
>> Thanks for your advice.
>>                     davidzhang
>>                     3/22/2000
>>
>> _____________________________________________
>> Ê׶¼ÔÚÏß--ÖйúÈ˵ÄÍøÉϼÒÔ° http://www.263.net
>> @263.netÖйú×î´óµÄÔÚÏßÓÊ¾Ö http://freemail.263.net
>>
>
>
>Pavel Roskin is right , that means to check RTS(from ads) or enable it manually.
>
Have you hack with this board?today i check the manual,find that it
has SCC1 RTS connect to rs232 CTS pin (pin 8),the init8260 program
from motorola did not init this pin(PD29).Should i program this pin?
How should i make the pin connection.For now,i connect DSR with DTR,
Tx with PC Rx,Rx with PC tx.Most amazing to me is that when i measure
the output wave from Tx pin,it is 0-5V.what it looks like when i
output a 'c' (0x63 which is 01100011) is as below:
    start  11    000      11   0   (lsbit to msbit)
5v    ---      ---------      ---

0v  --   ------         ------
All will be  right if 0v is -3 to -12 and 5v is 3 to 12
What wrong with this?
>b.r.
>john zhan.
>hacking time.
>
>
>
>


_____________________________________________
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Re:Re: About rs232 on motorola mpc8260 ads board

[zzh]

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>David--
>
>I've been using the MPC8260ADS board(ENGversion) for about 3months.
>I have Port1(SCC1) connectedtoa SUN tty port and have had no problems.
>There is demo oe on the Motorola site that show you how to program theport.As to the ranges of outpuut voltages,I have not measured them.
>
>Try
>http://www.mot-sps.com/products/microprocessors/32_bit/mpc8000/mpc8260_devtools.html
>cheers--
>SteveTarr
>
>
I am using the pilot version of the ads board,and  indeed run the
init8260 example from mot web site.How do you connect the pins?
According to ads manual,pin 2 from connector is tx,pin 3 is rx,
,and i also connect pin 4( DTR connect with SCC1 CD on PC14) with
pin 6(DSR).The output volatege is 0-5V.but the logic is 232.
I think it should be i had not  connectted the pins  correctly?
At the time of writing,when i reading the ads manual,i found CTS(pin 8) connect to SCC1's RTS on PD29.But the Init program did not program
this pin?How about eng version's connection?Should i program this pin?

>zzhwrote:
>

>>**Sentviathelinuxppc-embeddedmaillist.Seehttp://lists.linuxppc.org/
>--
>SteveTarr
>tarr@lucent.com
>303-538-4056
>
>


_____________________________________________
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@263.netÖйú×î´óµÄÔÚÏßÓÊ¾Ö http://freemail.263.net

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