serial console pin and keyboard pin.

XiangFu Liu xiangfu at qi-hardware.com
Sat Oct 3 22:31:01 EDT 2009


Hi Carlos

can we use PORTD 15 ( TP 38  free) as the keyboard in 8?
then we don't need the pull-up or pull-down resistor. right?


On Sun, Oct 4, 2009 at 8:19 AM, Carlos Camargo <cicamargoba at gmail.com>wrote:

> Hi
>
> Avt2 don't share any gpio with gpio, I upload the schematics in pdf format
> in [1], maybe there are some differences
>
> I found some similar mal-function because of serial port, I think that is
> necessary add a pull-up or pull-down resistor to RXD signal, because this
> signal can stop the normal boot on u-boot, if u-boot detect a false start
> bit enter to interactive console
>
>
> [1]
> http://downloads.qi-hardware.com/hardware/hacking/QI_AVT2_V1.0-0902JY.pdf
>
> Carlos
>
>
>
> On Sat, Oct 3, 2009 at 11:38 AM, XiangFu Liu <xiangfu at qi-hardware.com>wrote:
>
>> Hi adam
>>
>> is  the avt2 serial pin layout same with Ben?
>> (the RXD and keyboard use the same gpio)
>>
>> does the avt2 board have the random data input from serial RXD pin?
>>
>> I found some problem not sure it is software or hardware. (after I add
>> some code to kernel)
>>
>> when I connect the
>> Ben -- TTL -- USB serial -- PC, the keyboard driver work fine.
>>
>> but then I disconnect the TTL. the keyboard sometimes not work.
>>
>
>
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