[Tinyos-help] Junk data with Adc on telosb

[Nicolas Esteves]

Thanks a lot :)

Jan Hauer wrote:
> I'll take a look and see if I can reconstruct your problem,
> Jan
> [sorry for the late reply, I just returned from holidays]
>
>
> On 7/26/07, Nicolas Esteves <nicolas.esteves at inrialpes.fr> wrote:
>   
>> Hi,
>> When i use the multi channel sampling component (like in the
>> apps/tests/msp430/Adc12) I always have junk data at the beginning of the
>> sampling.
>>
>> I'm sampling channels INPUT_CHANNEL_A0, INPUT_CHANNEL_A1 and
>> INPUT_CHANNEL_A2 with REFERENCE_VREFplus_AVss for each channel and
>> REFVOLT_LEVEL_2_5, SHT_SOURCE_ACLK, SHT_CLOCK_DIV_1,
>> SAMPLE_HOLD_4_CYCLES, SAMPCON_SOURCE_SMCLK, SAMPCON_CLOCK_DIV_1 for the
>> config.
>>
>> I sample each channels like 200 times and the first results are always
>> like 0 or things greater than 4095, there is between 80 and 150 values
>> of this kind. I cant understand where itś coming from.. I tried to delay
>> the sampling after the mote wakeup but nothing changed. I tried to do
>> multiple sequences of capture because i thought that the values may be
>> caused by the wakeup, but nothing changed too. When i do the same with 3
>> distinct SingleChannel everything works fine.
>>
>> So if someone can help me it would be nice
>> thanks in advance
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>>
>>     
>
>
>