Re: HDLC Synchronous RS232

On 30 May 2005 11:15:28 -0700, "sunil" <sunil_maryala@xxxxxxxxxxxxxx>
wrote:

>hi,
> thanks for your response.
>as you have said iam able to see the 0x7f on the TXD line after the
>Transmitter is enabled. my only problem is iam not able to see the
>clock signal on the TXCLK line.

As has been pointed out the flags are 0x7E.

>I have set the PAPAR reister to all 1's i.e PAPAR = 0xffff
>
>PAODR = 0x0000;
>PADAT = 0xffff;
>PADIR = 0x0000;
>PAPAR = 0xffff;
>
>is there any problem with the above register settings?
>
>In the current scenario iam initializing BRG4 to 19.2 kbps and using it
>for the ports SCC2 and SCC3
>
>BRGC4 = 0x020000;
>BRGC4 = 0x0100a2;
>
>SICR &= 0xff0000ff;
>SICR |= 0x001b1b00;
>
>can u pls check my above settings for SICR and BRGC registers and see
>if iam doing it right?

I do not have the MC68360 docs handy, hence cannot check the detail.
In general you should look at the baud rate generator settings. It
should be possible to output this clock on a pin regardless of what
mode the SCC is in. Setting up the pins to output the signal you want
is probably descriped in a different section from where the SCC is
described. You probalby need to set up some registers that has
something to do with selecting either an alternative function for a
pin or using it as a general purpose I/O.

Regards
Anton Erasmus


>
>Anton Erasmus wrote:
>> On 27 May 2005 09:01:06 -0700, "sunil" <sunil_maryala@xxxxxxxxxxxxxx>
>> wrote:
>>
>> >hi all,
>> >
>> > iam currently programming MC68360 board processor SCC's to work for
>> >Synchronous HDLC and iam taking out RS232 pin outs from the P2
>> >connector.
>> >
>> >I have initialized the registers and set jumpers according to the
>> >instructions. but iam not getting the Clock signals from the TXCLK
>> >lines.
>> >can u pls give me some hints what r the things that can go wrong which
>> >will lead to this kind of problem.
>> >
>>
>> Are you seeing flags on your TX line ? 0x7F at whatever bitrate
>> you are using. If the transmitter is enabled, HDLC mode selected
>> you should see 0x7F on the TX line. If not, then either you have not
>> enable HDLC mode, or TX is disabled ot you have selected to not have
>> flags in idle mode.
>>
>> Regards
>> Anton Erasmus

.

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