Hi Eric, Thanks for the very fast reply. I looked at the User Guide and it just says there that the 12-bit ADC is capable of more than 200Ksps.
I got 25 using the computation in tos/chips/MSP430/adc12/README.txt as a pattern. The example there is just for 4000Hz though - much smaller than my desired sampling frequency of 40Khz. I am just wary of hitting any limitations that the chip may have, or whether I am going about it(reaching 40KHz sampling rate) the right way. You're right, the code does work in a sense that I am getting samples, however, I am not sure that the chip indeed is sampling at 40kHz(is there even a way of verifying that?). Again, thanks. I guess this code's already OK then, at least in terms of achieving 40Khz. On Fri, Apr 5, 2013 at 1:13 AM, Eric Decker <[email protected]> wrote: > you will need to study the cpu documentation. > > are you using the telosb? > > the manual you want for the 1611 is the User's Guide for the 1611 family. > msp430x1xx > > You should also look at the specific data sheet for the part. > > Where did you get the number 25 from? > > > But all things considered (I just looked at the data sheet), it should > work. > > > > On Fri, Apr 5, 2013 at 12:49 AM, Andres Mabini > <[email protected]>wrote: > >> Hi all, >> >> What is the maximum sampling frequency that the MSP430 12-bit ADC could >> support? >> >> If I want to sample at around 40KHz using Msp430Adc12ClientAutoDMAC() as >> the client, am I doing it correctly if I set the config as >> >> #define CONFIG_AVCC INPUT_CHANNEL_A0, REFERENCE_AVcc_AVss, >> REFVOLT_LEVEL_NONE, SHT_SOURCE_SMCLK, SHT_CLOCK_DIV_1, >> SAMPLE_HOLD_4_CYCLES, SAMPCON_SOURCE_SMCLK, SAMPCON_CLOCK_DIV_1 >> >> and call >> >> call SingleChannel.configureMultiple(&config, buffer, BUFFER_SIZE, 25 >> >> ? >> >> I reckoned 1048576 / 25 = 41 934, so the resulting sampling frequency >> would then 41KHz. Is this correct? >> >> Much thanks. >> >> >> >> _______________________________________________ >> Tinyos-help mailing list >> [email protected] >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> > > > > -- > Eric B. Decker > Senior (over 50 :-) Researcher > >
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