Serial communication with a header and a terminator

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Marzieh Karami 2019-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/466247-serial-communication-with-a-header-and-a-terminator

回答： Gayatri Menon 2022-1-4

I want to send two uint16 numbers through the serial communication. The DSP wants the header and terminator to be equal to 'S' and 'E'. The command serial does not have an option for 'header' but it has an option for defining 'terminator'.

obj=serial(USBport);
obj.BaudRate=9600;
obj.Terminator='E';
obj.ByteOrder='LittleEndian';

To use the header I am writing

fwrite(obj,'S','char')

Now in order to send the two numbers I am using:

 x = int16(1);
fwrite(obj,[x x],'int16')

I know that in each fwrite command an 'E' will be sent as well. How can I avoid this? Can I just send E at the end of the commands with another fwrite?

I am using this block to configure the DSP for receiving data.

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Walter Roberson 2019-6-10

"I know that in each fwrite command an 'E' will be sent as well."

That should not happen. fprintf() can send terminators when you are not expecting them, but fwrite should not send the terminator unless you happen to send one as data.

However, you would want to check to see whether it sends each fwrite() as a separate packet, which could be a problem for USB over serial.

Marzieh Karami 2019-6-17