MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manual de usuario descargar pdf (Pagina 360)

100

101

8 Serial Port I/O

8-40

You can verify the number of values read from the device – including the

terminator – with the

ValuesReceived property.

s.ValuesReceived

ans =

Synchronous Versus Asynchronous Read Operations.

You specify whether read

operations are synchronous or asynchronous with the

ReadAsyncMode property.

You can configure

ReadAsyncMode to continuous or manual.

ReadAsyncMode is continuous (the default value), the serial port object

continuously queries the device to determine if data is available to be read. If

data is available, it is asynchronously stored in the input buffer. To transfer the

data from the input buffer to MATLAB, you use one of the synchronous

(blocking) read functions such as

fgetl or fscanf. If data is available in the

input buffer, these functions will return quickly.

s.ReadAsyncMode = 'continuous';

fprintf(s,'*IDN?')

s.BytesAvailable

ans =

out = fscanf(s);

If ReadAsyncMode is manual, the serial port object does not continuously query

the device to determine if data is available to be read. To read data

asynchronously, you use the

readasync function.You then use one of the

synchronous read functions to transfer data from the input buffer to MATLAB.

s.ReadAsyncMode = 'manual';

fprintf(s,'*IDN?')

s.BytesAvailable

ans =

readasync(s)

s.BytesAvailable

ans =

out = fscanf(s);

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MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manual de usuario Pagina 360

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