Simple Matlab & Arduino Serial Communication

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Tyler
Tyler on 1 Jul 2013
Commented: Ana-Maria Moga on 24 Jul 2021
I am attempting a running the following program and am getting strange results. After opening the serial port, the Arduino sends a "Ready" command to matlab. Then it sends a uint16 (2 bytes) value of 500 to the arduino. The arduino simply echoes what was received back to matlab in HEX.
When I run this I expect readData to equal 0x01F4, but I get 0xC0F4. Any suggestions?
Arduino CODE:
byte incomingByte1;
void setup(){
pinMode(2,OUTPUT);
Serial.begin(115200);
Serial.println("Ready");
}
void loop() {
digitalWrite(2,LOW); //turn off LED
delay(500);
if (Serial.available() > 0) {
digitalWrite(2,HIGH); //flash LED everytime data is available
delay(500);
incomingByte1 = Serial.read(); //read incoming data
Serial.println(incomingByte1,HEX); //print data
}
}
Matlab CODE:
clear
clc
s=serial('COM7','BaudRate',115200);
fopen(s);
readData=fscanf(s) %reads "Ready"
writedata=uint16(500); %0x01F4
fwrite(s,writedata,'uint16') %write data
for i=1:2 %read 2 lines of data
readData=fscanf(s)
end
fclose(s);
delete(s);
OUTPUT:
readData =
Ready
readData =
F4
readData =
C0
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Answers (1)

islam dib
islam dib on 8 Dec 2020
Hello,
How can I read data sending from arduino via serial port, in Matlab?

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