get continuous data in while loop through serial

8 次查看(过去 30 天)
Hello,
I need help with reading data from serial. Basically I have arduino that sends data "0" or "1" randomly every 2-4 seconds. When I save this data i will get 0 or 1. However, what I want is a continuous data, i.e. even when the true or false does not change, i still can record that. in this case have an array of 0 or 1 instead of 01010101. how can i do this? my code:
s = serial('COM13', 'BaudRate', 115200);
fopen(s);
y=[];
t1 = tic;
while (t<10)
x = fscanf(s)
t = toc(t1);
y = [y; t, x] % right now it's only 010101, but i want eg 00000011111111111110001111...
%with time stamp
end

回答(1 个)

Walter Roberson
Walter Roberson 2019-1-18
You can test the BytesAvailable property of the port. If it is 0 then repeat your most recent reading . You might want to configure a timer object to sample at appropriate frequency .
  3 个评论
Walter Roberson
Walter Roberson 2019-1-18
It would be 0 except when data has been received but not processed . Your current fgets is blocking waiting for a complete line so you would need to be using a timer to detect the situation as timers should be able to interrupt the wait.
You should reorganize . Don't use while . Use BytesAvailableFcn to trigger the fgets and store the result in a known place . use aa timer object set to repeat at your desired sampling frequency . The timer should retrieve the current value from the known location and leave the value there . If the timer fires again before the BytesAvailable callback has read in the next value then the same value as before will be read.
Sharah
Sharah 2019-1-18
编辑:Sharah 2019-1-18
Actaully I made a mistake before and using the BytesAvailable works now. Many thanks for the suggested answer. DO you know any sample code that shows BytesAvailableFcn? I have never used it before. I need to read and store the data at 100Hz.

请先登录,再进行评论。

类别

Help CenterFile Exchange 中查找有关 Develop Apps Using App Designer 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by