How do I specify the output data type for a Simulink block to be in the Q format, as used in the TI IQmath library? I am using the Embedded Coder Support Package for TI C2000 Processors.
MATLAB: Specifying Data Type for Code Generation with IQmath Library
c2000dataEmbedded Coderfixdtfixedfixed-pointformatiqmathpointqtitype
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Texas Instruments C2000™ MCUs support 16-bit and 32-bit data types. Simulink® models and Embedded Coder® software support many data types.
Integer Types:
TI2000 MCUs do not support native 8-bit data types. If you select int8 or uint8 in your model, your simulation runs with 8-bit data, but in the generated code this data is represented as 16-bit. This may cause instances where data overflow and wraparound occur in the simulation, but not in the generated code.
Floating-Point Data:
In C2000 devices, in the generated code, the double data type is represented as single precision floating point values (32-bit). This representation results in a difference in data values in the simulation and the generated code.
Fixed-Point Data:
Fixed-point data type is also supported and using C28x IQmath Library blocks, one can perform processor-optimized fixed-point mathematical operations. Details on C28x IQmath Library blocks are available here:
One can enable this Code Replacement Library (CRL) in your model's Configuration Parameters as shown below when using fixed-point math to generate optimized code using IQ math routines:
This change has been incorporated into the documentation in Release 14 Service Pack 3 (R14SP3). For previous releases, read below for any additional information:
The product requirements for the Embedded Target for TI C6000(tm) DSP 2.2.1 (R14SP1) are incomplete in that they list the Fixed-Point Toolbox and Simulink Fixed-Point as recommended products, not required products.
The Fixed-Point Toolbox and Simulink Fixed Point are required to enable the fixed-point features of the the Embedded Target for TI C6000(tm) DSP 2.2.1 (R14SP1) such as using the included fixed-point DSP libraries or targeting fixed-point processors.
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