i'm trying to get data from force sensors using Xbee and the buffer size is 512 i want the xbee to collect the data for 1 minute exactly

Question

avinash pabbireddy 2013-10-28

0
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https://ww2.mathworks.cn/matlabcentral/answers/104183-i-m-trying-to-get-data-from-force-sensors-using-xbee-and-the-buffer-size-is-512-i-want-the-xbee-to

回答： Walter Roberson 2014-3-11

clc; close all; clear all;  
delete(instrfindall);
s = serial ( 'COM5', 'BaudRate', 115200);
fopen(s);
format shortg
bt = clock
et= clock+[0 0 0 0 1 0]
while bt-et<=0
      data= fread(s);
bt= clock;
end

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Answer 1

Walter Roberson 2014-3-11

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https://ww2.mathworks.cn/matlabcentral/answers/104183-i-m-trying-to-get-data-from-force-sensors-using-xbee-and-the-buffer-size-is-512-i-want-the-xbee-to#answer_127867

MATLAB cannot resolve time infinitely precisely, so you cannot collect data to better accuracy than 1 minute +/- 1 microsecond. MATLAB also is not designed to be able to interrupt an fread() operation.

You would also be better off if you told fread() how much data you want to read at a time.