Reading from serial port
4 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi, I need to interface MATLAB with a COM port to read data from sensors. Here is my MATLAB code.
s = serial('COM5');
s.BaudRate = 115200;
fopen(s);
tic
for i = 1:25
an = fscanf(s,'%c');
end
toc
fclose(s);
I have used "tic" "toc" for measuring execution time to read 25 values and its almost 5 seconds. This is pretty slow. 115200 is the max Baud Rate.
Is there a better/faster way to read from a serial port???
Thanks all
0 commentaires
Réponses (1)
Ankit Desai
le 9 Fév 2011
Akash,
You might be getting the data slowly. The delay might be caused by fscanf waiting for data to be available. As listed in the documentation - fscanf waits for data to be available until a timeout occurs.
You can confirm the same by checking that there 50 bytes available (25 bytes for character values + 25 bytes for terminator values) before you call the fscanf(s) in the for loop.
You can do so by checking the BytesAvailable field of the object.
s.BytesAvailable
I tried the same and was able to do so in < 1 second.
Hope this helps,
-Ankit
0 commentaires
Voir également
Catégories
En savoir plus sur External Language Interfaces dans Help Center et File Exchange
Produits
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!