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Please refer to the demo Code-Examples-BT-SDK-for-ModusToolbox-master\CYW920819EVB-02\apps\demo\datalogger. It has the example for SPI master and slave.
I found that one and have been working with it. It is dual with the RTOS. I have to wade through a lot of code that is not as easy to navigate. I was hoping for something simpler to start.