uart interface issues (fixed)

Oleksij Rempel linux at rempel-privat.de
Thu May 2 03:20:10 EDT 2013


Am 02.05.2013 09:15, schrieb Eugene Krasnikov:
> Hi Oleksij,
>
> Have you tried remote debugging? Or it's only about garbing logs from
> the chip. Have you tried to send commands to the chip?

Yes, it works. You need this resistors to make chip start with ttl 
adapter attached. Without them this chip may not start.

> 2013/5/2 Oleksij Rempel <linux at rempel-privat.de>:
>> Am 28.04.2013 16:17, schrieb Oleksij Rempel:
>>>
>>> Am 28.04.2013 13:38, schrieb Adrian Chadd:
>>>>
>>>> .. is it triggering BREAK interrupts or something?
>>>
>>>
>>> I don't know, there is no serial output on this stage. JTAG may help if
>>> the protocol is some how similar to EJTAG. Are there any documentation
>>> about Xtensa dubug interface ;)?
>>> I will need to dig in it, but not this week.
>>>
>>>
>>>> That may be something that the boot ROM code interprets as a magical
>>>> "don't start" sequence or something.
>>
>>
>> So, this issue is fixed now.
>>
>> ttl TX >------[2K]--------o RX pin on AR7010
>>                       |----[4K pull up]---< 3,3V
>>
>> In attachment are pictures from my setup ;)
>>
>> --
>> Regards,
>> Oleksij
>
>
>


-- 
Regards,
Oleksij



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