The difference in read rate is not the board (A3 vs B1) but a code change to temporarily slow down the access of the TWSI bus the accelerometer is on due to a temporary hardware constraint. -Saadia
On Mon, Aug 29, 2011 at 12:10 PM, Bert Freudenberg <[email protected]>wrote: > > On 25.08.2011, at 07:47, James Cameron wrote: > > > On Thu, Aug 25, 2011 at 03:22:06PM +1000, [email protected] wrote: > >>> I don't know enough about Turtle Blocks to comment, but if an > >>> application such as Turtle Blocks tries to read the sensor, it will > >>> probably block for as long as it takes for the transaction to complete > >>> ... roughly 33 milliseconds. > >>> > >> > >> I am getting 60mS per read in Turtle Blocks > > > > On an XO-1.73 A3, I saw 25 reads per second, which would have been 40mS > > per read. > > > > On an XO-1.75 B1, I get between 17.07 and 18.22 reads per second in > > /runin/runin-accelerometer with os40. That would be 59mS to 55mS. > > A shell script needs 6.7 seconds to read it 100 times. That's 67 ms, B1 on > os41. > > In any case it's fun to use, I made a little Etoys project to try: > > > http://croquetweak.blogspot.com/2011/08/squeak-etoys-on-arm-based-xo-175.html > > (and in Etoys each read takes about 65 ms). > > - Bert - > > > _______________________________________________ > Devel mailing list > [email protected] > http://lists.laptop.org/listinfo/devel >
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