Hier Blocks and Parameters
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This tutorial describes how to create a hierarchical block, or Hier block, in GRC. The previous tutorial, Creating Your First Block, demonstrates how to create your first GNU Radio block using the Embedded Python Block.
Creating a Flowgraph
A hier block is used to encapsulate and simplify multiple GNU Radio blocks into a single block. The example hier block will be a frequency shifter block which multiplies a Signal Source against an input signal.
The first step is creating the flowgraph. Drag and drop the following blocks into the workspace:
- Signal Source
- Multiply
- Throttle
- QT GUI Frequency Sink
- QT GUI Range
Connect the blocks:
