No subject

Tue Jan 13 16:53:41 PST 2009

2ms not 100ms now.
 Why is it incorrectly operate? Our project must integrate sensor =
value with time. Thus exact conversion period is important.
 implementation {&nbsp;&nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nb=
sp; &nbsp;&nbsp; const msp430adc12_channel_config_t config =3D { &nb=
sp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; INPUT_CHANNEL_A0, REFERENCE_AVcc_AVs=
s, REFVOLT_LEVEL_NONE, &nbsp;&nbsp;&nbsp; SHT_SOURCE_SMCLK, SHT_CLOCK_DI=
V_1, SAMPLE_HOLD_64_CYCLES, 
&nbsp;&nbsp;&nbsp; SAMPCON_SOURCE_SMCLK, SAMPCON_CLOCK_DIV_1 &nbsp;&nbs=
p;&nbsp; &nbsp;&nbsp; }; &nbsp; &nbsp; event void Boot.booted()<=
br>&nbsp; { &nbsp;&nbsp;&nbsp; call Resource.request(); //from adc test<=
br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; } &nbsp;&nbsp;&nbsp; //////=
///////////////////////////////////////////// 
&nbsp; adc12memctl_t memctl[16]; &nbsp; uint8_t numMemctl; &nbsp; #de=
fine ADCNUMS 5 &nbsp; #define NUM_SAMPLES 50 &nbsp; uint16_t buffer[=
NUM_SAMPLES]; &nbsp;&nbsp;&nbsp;&nbsp; &nbsp; event void Resource.gr=
anted() &nbsp; { &nbsp;&nbsp;&nbsp; error_t result; &nbsp;&nbsp;&n=
bsp; uint8_t i; 
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; for(i=3D0; i&lt;ADCNUMS-1; i++){<=
br>&nbsp;&nbsp;&nbsp;&nbsp; memctl[i].inch=3Di+1; //List of additional chan=
nels &nbsp;&nbsp;&nbsp;&nbsp; memctl[i].sref=3DREFERENCE_AVcc_AVss; &=
nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; numM=
emctl =3D ADCNUMS - 1;//chs - 1 &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp=
; //1000000 MCLK / 500 sample per sec for all chs =3D 2000. 
&nbsp;&nbsp;&nbsp; result =3D call MultiChannel.configure(&amp;config, memc=
tl, numMemctl, buffer, NUM_SAMPLES, 2000); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; if (result =3D=
=3D SUCCESS){ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; call MultiChannel.getData()=
; &nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp; else{ &nbsp;&nbsp;&nbsp;=
&nbsp; &nbsp;&nbsp;&nbsp; } 
&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; }
 //This must be called every 100ms. 10hz. &nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; //But now it is called 93.2ms every.!!! Why? &nbsp; async e=
vent void MultiChannel.dataReady(uint16_t *buf, uint16_t numSamples) &nb=
sp; { call Leds.led1Toggle(); //check by oscilloscope LED1 pin.

<div><br>call MultiChannel.getData(); //call next conversion sequence...<br=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>&nbsp; }</div>
<div>&nbsp;</div>
<div>best regards,</div>
<div>K.S.Lee</div>

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