Yes. See the MSP430 f1611 Data Sheet. On about page 38, "12-bit ADC,
external reference", the minimum positive external reference voltage is 1.4V.
- Cory
On 5/30/07, Dan Steingart <[EMAIL PROTECTED]> wrote:
Thanks Cory. Before I go any further, is there a minimum to the reference
voltage? I'm going for a ceiling of 60 mV.
Dan
On 5/30/07, Cory Sharp <[EMAIL PROTECTED]> wrote:
>
> Dan, it sounds like you've done everything necessary. Try bypassing the
> TinyOS MSP430 ADC components and check the ADC by directly setting the
> MSP430 control registers. Be sure to appropriately set these registers, in
> particular:
>
> P6SEL
> P6DIR
> ADC12CTL0
> ADC12CTL1
> ADC12IFG
> ADC12IE
>
> See the MSP430 User's Guide section ADC12 for appropriate values. Then
> trigger a conversion with
>
> ADC12CTL0 |= ENC | ADC12SC;
> ADC12CTL0 &= ~ADC12SC;
>
> You can throw together a quick and dirty ADC interrupt handler like this
>
> TOSH_SIGNAL(ADC_VECTOR) {
> uint16_t iv = ADC12IV;
> if( iv == 0x06 ) {
> ADC12IE = 0;
> reading = ADC12MEM0;
> post readDone();
> }
> }
>
> - Cory
>
> On 5/30/07, Dan Steingart < [EMAIL PROTECTED]> wrote:
>
> > Hello all,
> >
> > I've combed the interweb, moved a jumper that was roughly the size of
> > a grain of sand, and picked through Redfern's brain to the point where he
> > said "read the MSP430 manual", but I can't seem to get the external
> > reference going on my Tmote Sky.
> >
> >
> > things I've done
> >
> > - In my ADC header file I changed the VRef to VeRef
> > - Moved the jumper over
> > - Fed the ref voltage to ADC0 (port 60, correct?)
> > - Turned ADC0 into an Input pin with MSP430GeneralIO
> >
> > Is there something blatantly wrong here? Is there a contrib file or
> > other example I'm missing?
> >
> > Thanks in advance,
> >
> > Dan
> >
> >
> >
> > _______________________________________________
> > Tinyos-help mailing list
> > Tinyos-help@Millennium.Berkeley.EDU
> > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
> >
> >
>
>
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