Re: [ECOS] kinetis kwikstik's ecos trouble

[Ilija Kocho <ilijak@siva.com.mk>]

Hi

It may be a hardware issue, depends on how do you power Kwikstik and
what do you use for RS232 signals?

I would assume that you use TWR-SER or compatible 3.3V MAX chip.
Then if you power the Kwikstik through it's own USB the Vdd voltage will
be 2.8V due to drop on serial Schottky diode (see Kwikstik schematic).
It seems the output level is too low for 3.3 MAX chip and you won't see
output although the chip is working.

If you power through Tower elevator then Vdd is 3.3V and you'll see output.

I hope this helps.

Ilija

On 26.06.2012 08:39, tangwei wrote:
> Dear all,
>   redboot have run on my kwikstik ok, but I am not sure whether the ecos is OK, my steps is below:
> use the CVS version which contains freescale's kwikstik template,
> 1. use the default setting for kwikstik to get the "libtarget.a" and etc;2. build the examples from the ecos/examples/ ,such as hello.c ,twothreads.c ,simple-alarm.c
> use the command below
> /opt/ecos/gnutools/arm-eabi/bin/arm-eabi-gcc -g -D_ECOS -I ../../test/default_install/include/ simple-alarm.c -L ../../test/default_install/lib -Ttarget.ld -nostdlib
> and get the a.out file3. transfer a.out into .bin ,use command below
> /opt/ecos/gnutools/arm-eabi/bin/arm-eabi-objcopy  -O binary a.out simple-alarm.bin
> finally I get hello.bin,twothreads.bin, and simple-alarm.bin 
>
> 4.Then I use j-Link to download any of the three bin file , the UART have nothing output, by the way, the UART's software and hardware's setting are the same-38400 8N1,UART5, and the redboot works OK.Does the UART setting is OK, and can someone tell me where is the bug?
> Thanks
> ----------tangwei 		 	   		  
>


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