Hello;
I am currently working on a project about Emg signals which are basicly muscle signals.
For Emg signals i need 1000 sample rate.
With Stm32 microcontroller i'm able to read and send the data to matlab with 4000 hz .
But reading that much data with 1000 hz from matlab is problematic.
I'm sending data with syntax like this :
" .1234/0587.1234/0587.1234/ "
When matlab reads that data it takes "1234" and store it in a variable . also it takes the second part "0587" and store it in another variable
here is my serial reading function:
function [sizeVector,varargout]=read2piece(serial)
temp=0;
readings = fread(serial,1,'uchar');
while(readings~=47 )
readings = fread(serial,1,'uchar') ;
end
temp= fread(serial,9,'uchar');
a=temp';
sizeVector(1)=a(1)*1000+a(2)*100+a(3)*10+a(4);
sizeVector(2)=a(6)*1000+a(7)*100+a(8)*10+a(9);
varargout = cell(1,nargout-1);
for k = 1:length(varargout)
varargout{k} = sizeVector(k);
end
end
here is the explanation : 1234.2345/ data comes like this. i first try to detect beginning of packet which is / and ascii for / is 47. so icheck if freads reads 47 value.
if it does then i can easly read my full packet because it is in order packet is 9 char long. first 4 char belong to data1 and the last 4 char belongs to data2 . so i convert these digits to real numbers. now they are integers.
this function's 1 loop is 0.002935 sec. something like 300 hz.
my baudrate is 115200 . My code works fine with low speed. I am able to read 1000*9 =10 kb in 42 secs. What i have to achieve is like 10 seconds. That would be enough for me .
