./tests: Move PSOC specific variables from spi test to test_config.

[ramya-subramanyam]

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We previously used project-specific class names "SPIClassPSOC" in SPI tests to create slave and master instances. This has now been moved to a test_config source file to enhance its generic nature and reusability across different projects.

[Copilot]

Pull Request Overview

This PR refactors PSOC-specific SPI variables by moving them from SPI test files to a centralized test configuration. The purpose is to improve code organization and reusability across different projects by removing hardcoded class names from test files.

• Moved PSOC-specific SPI class declarations to test_config.h/cpp
• Created centralized global SPI instances for master and slave configurations
• Added proper forward declarations and implementations to avoid multiple definition errors

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
tests/test_config.h	Added SPI.h include and forward declarations for spi_master/spi_slave instances
tests/test_config.cpp	New file implementing SPI instance definitions with proper initialization

Comments suppressed due to low confidence (1)

tests/test_config.cpp:15

• [nitpick] The variable name 'SPI1' is inconsistent with the declared naming pattern. Consider renaming to 'spi_slave_instance' or similar to match the naming convention used for the pointer variables.

SPIClassPSOC SPI1 = SPIClassPSOC(PIN_SPI_MOSI, PIN_SPI_MISO, PIN_SPI_SCK, TEST_PIN_SPI_SSEL, true);

[jaenrig-ifx]

Should not SPIClass work for both ports? https://github.com/arduino/ArduinoCore-API/blob/master/api/HardwareSPI.h#L129

[ramya-subramanyam]

Should not SPIClass work for both ports? https://github.com/arduino/ArduinoCore-API/blob/master/api/HardwareSPI.h#L129

It will not work because in PSOC project the class name is SPIClassPSOC.
HardwareSPI is abstract class and SPIClass depends on it. May be we can try what you suggest during the pairing daily call