Example mcp4922 test

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This is a guide to the mcp4922_test C example project included in the EMAC OE SDK.

This is an example application for accessing the EMAC interface for the on-board DtoA of the SoM-150ES. This interface uses the EMAC ioex class to provide a GPIO-like interface (see also the egpc project). This application outputs a sine wave on channel 0 and a cosine wave on channel 1.

The mcp4922_test project builds one executable: mcp4922_test.

Opening, Building and Uploading the Project Files

1. Open the C/C++ editing perspective.

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2. Open the project files.

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3. Build the project.

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4. Upload the executables to the target system.

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Usage and Behavior

mcp4922_test outputs a sine wave on channel 0 and a cosine wave on channel 1.

Hardware Requirements

The mcp4922_test C example project requires an EMAC SoM-150ES carrier board.

Using mcp4922_test

./mcp4922_test

You'll get the signal on the analog out port. Pin 15 is analog out 0 and pin 16 is analog out 1. GND is 1,2,17,18. Range is 5V. You'll need an oscilloscope and a board schematic.