[WIP] Adapt SPI slave example for MAX7219 LED matrix

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Adapt the repository's SPI slave example for the PIC18F47Q10 to drive a MAX7219 LED matrix module. The LED matrix is connected as follows: Dout (Matrix) to RC3 on the microcontroller, CSK (Matrix) to RC3, and CS (Matrix) to RC3. Combine SPI initialization with functions to repeatedly blink an LED on the MAX7219 matrix using the SPI communication protocol. Retain the provided PPS (Peripheral Pin Select) configuration as shown in the original code. Make all necessary modifications to initialize and control the MAX7219 and implement a basic LED blink cycle.

This pull request was created as a result of the following prompt from Copilot chat.

Adapt the repository's SPI slave example for the PIC18F47Q10 to drive a MAX7219 LED matrix module. The LED matrix is connected as follows: Dout (Matrix) to RC3 on the microcontroller, CSK (Matrix) to RC3, and CS (Matrix) to RC3. Combine SPI initialization with functions to repeatedly blink an LED on the MAX7219 matrix using the SPI communication protocol. Retain the provided PPS (Peripheral Pin Select) configuration as shown in the original code. Make all necessary modifications to initialize and control the MAX7219 and implement a basic LED blink cycle.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.