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Binary File Reader

Read data from binary files

  • Library:
  • DSP System Toolbox / Sources

Description

The Binary File Reader block reads multichannel signal data from a binary file. The block reads the header that precedes the data. The File header parameter specifies the structure of the header. You can specify the type, size, and complexity of the data through the block parameters. You can also export the header to the base workspace by clicking on the Export header to base workspace button.

The first time you read the file, the reader reads the header, followed by the data. On subsequent calls, the reader reads the remaining data. Once the end of the file is reached, the reader returns zeros of the specified data type, size, and complexity. The reader can read signal data from a binary file that is not created by the Binary File Writer block.

Ports

Output

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The reader block reads the binary data from the file specified in the File name parameter. The data output from the block has dimensions Samples per frame-by-Number of channels. The block can read floating-point data and integer data. The input data can be real or complex. When the data is complex, the block reads the data as interleaved real and imaginary components. The reader assumes the default endianness of the host machine.

This port is unnamed until you select the Output end-of-file indicator parameter.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64
Complex Number Support: Yes

When the block reaches the end of the file, the port outputs a 1. Otherwise, the port outputs a 0.

This port is unnamed until you select the Output end-of-file indicator parameter.

Data Types: Boolean

Parameters

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Name of the file from which the block reads the data. If the file is not on the MATLAB® path, then specify the full path for the file.

The structure specifies the prototype of the file header, that is, the size of the header and the data type of the field values. The structure can have an arbitrary number of fields. Each field of the structure must be a real matrix of a built-in type. For example, if File header is set to struct('field1',1:10,'field2',single(1)), the block assumes that the header is formed by 10 real double-precision values followed by 1 single-precision value. If the file contains no header, you can set this parameter to an empty structure, struct([]).

To retrieve the file header, click Export header to base workspace. The block exports the file header to the base workspace.

Storage class of data in file, specified as a character vector. This parameter defines the data type of the matrix the block outputs.

Samples per frame specifies the number of rows of the output matrix that the block outputs. The output matrix has dimensions Samples per frame-by-Number of channels. Once the end of the file is reached, the block returns zeros of the specified data type, size, and complexity.

When you select this parameter, the reader treats the data as complex data. The block reads the data as interleaved real and imaginary components. Configure the block to read the data as a 2-by-2 matrix. The block reads [1 5 2 6 3 7 4 8] as [1 2; 3 4]+1j*[5 6; 7 8]. When you do not select this parameter, the block reads the data as [1 5; 2 6].

Number of channels specifies the number of columns of the output matrix that the block outputs. This parameter defines the number of consecutive interleaved data samples stored in the file for each time instant. The size of the data is Samples per frame-by-Number of channels. Once the end of the file is reached, if the output matrix is not full, the block fills the matrix with zeros to make it a full-sized matrix.

When you select this parameter, an additional output port named EOF appears on the block. When the block reaches the end of the file, the port outputs a 1. Otherwise, the port outputs a 0.

Sample time (s) controls the sample time at the output port of the block. This value represents 1/Fs, where Fs is the sampling rate of the signal data. The Simulink® sample time at the output port is Samples per frame × Sample time (s).

  • Code generation — Simulate model using generated C code. The first time you run a simulation, Simulink generates C code for the block. The C code is reused for subsequent simulations, as long as the model does not change. This option requires additional startup time but provides faster simulation speed than Interpreted execution.

  • Interpreted execution — Simulate model using the MATLAB  interpreter. This option shortens startup time but has slower simulation speed than Code generation.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Introduced in R2016b

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