HOW to send serial data to matlab to pic controller? and how to differentiate multiple data which is transmitted by matlab?

Question

rinku some 2014-2-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/118741-how-to-send-serial-data-to-matlab-to-pic-controller-and-how-to-differentiate-multiple-data-which-i

评论： Walter Roberson 2014-2-24

matlab code

st=12 %person in
sto=10 %person out
total=st-sto;
s=serial('com15');
set(s,'BaudRate',9600,'DataBits',8,'Parity','none','StopBits',1,'FlowControl','none','InputBufferSize',102400) % serial port properties
fopen(s);
fwrite(s,st);% serial data transmission
fwrite(s,sto);%serial data transmission
fwrite(s,total);serial data transmission
stopasync(s);
fclose(interfaceObj);
delete(interfaceObj);
clear(interfaceObj);

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2014-2-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/118741-how-to-send-serial-data-to-matlab-to-pic-controller-and-how-to-differentiate-multiple-data-which-i#answer_125845

在 MATLAB Online 中打开

You need to know what data form the other side expects. I think it more likely that you want to use

fwrite(s, uint8(st));
fwrite(s, uint8(sto);
fwrite(s, uint8(total));

but it is also possible you want something like,

fprintf(s, '%d', st);
fprintf(s, ' %d', sto);
fprintf(s, ' %d', total);

2 个评论
显示无隐藏无

rinku some 2014-2-24

HEY thanks for reply now i transmitted this data by mat lab and receive it by pic and display this on lcd so how i know that this particular bit is for st or sto .

Walter Roberson 2014-2-24

You create a "protocol", which is a formal sequence of the order of operations and the representation of those, and the appropriate response.

For example your protocol could say "The first 8 bits are an unsigned 8 bit integer representing the number of people in; the next 8 bits are an unsigned 8 bit integer representing the number of people out; this sequence is to continue indefinitely. The end of the stream of data is signaled by the people in and people out both being 255."

If both ends are "free running" then your protocol may have to be more complex in order to achieve synchronization.

请先登录，再进行评论。