Working with serial port in Raspberry Pi 3 B+

Hi everyone,

I am a beginner in MATLAB and Raspberry Pi. I have a radar that is connected to my Raspberri Pi. I want to acquire data from the radar and process it by my desktop installation of MATLAB. I have used these code for connecting to Raspberry Piand its serial ports:

myraspi= raspi('192.168.137.46','pi','raspberry');   
comportnum_str_Data='/dev/ttyACM1';
hDataPort=serialdev(myraspi,comportnum_str_Data,230400,8,'none',1);
comportnum_str_Cfg='/dev/ttyACM0';
hCfgPort=serialdev(myraspi,comportnum_str_Cfg,115200,8,'none',1);

So, my questions:

1- How can I open to these ports? As an example, in Linux and Windows we can use serial function for onnecting and 'fopen' for openning port.

2- How we can check port status? like windows that is:

hDataPort.BytesAvailable

3- How we can check port input buffer size? Like:

hDataPort.InputBufferSize

Answer 1

[Reeno Joseph]

Hello Hajar

This feature is not available in raspi - MATLAB IO. We will consider your usecase for future enhancements.

Thanks,

Reeno Joseph

[Robert White]

I also need to know BytesAvailable using Raspberry Pi from matlab ... is there no BytesAvailable property in the serial object? Is there any way to find out how many bytes are available?

Answer 2

[Robert White]

Here is an ugly way to read all available bytes and interpret them as an array of chars:

%Read serial port over raspberry pi

r=raspi

mySerialDev=serialdev(r,'/dev/ttyACM0',115200);
mySerialDev.Timeout=0.1;
data=read(mySerialDev,1,'char');
n=1;
clear mystring
while (~isempty(data))
    mystring(n)=data;
    n=n+1;
    data=read(mySerialDev,1,'char');
end
disp(mystring)

[James Bittner]

Thank you.