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The context provided does not include specific protocols or example applications for SPI communication between an MCU and an MPU in a Linux environment. However, I can offer some general guidance based on typical practices:
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Protocol Selection: For communication between an MCU and an MPU over SPI, you might consider using a simple custom protocol or a lightweight protocol like Modbus SPI, which is often used for industrial communication. The choice of protocol will depend on the complexity of the data you need to exchange and the capabilities of your devices.
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User-Space Access: You can use the
spidevinterface in Linux to access SPI devices from user space. This allows you to write applications in C or other languages to send and receive data over SPI. Thespidev_test.csample code in the Linux kernel sources can serve as a starting point for developing your application. -
Kernel-Space Drivers: If you need more control or performance, consider writing a kernel-space driver. The Linux kernel provides drivers for various SPI devices, and you can use these as examples. For instance, the MCP2515 CAN controller driver is mentioned in the context as an example of an SPI device driver.
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Efficient Configuration and Monitoring: To efficiently configure and monitor IOs, ensure that your protocol includes commands for reading and writing the necessary registers on the MCU. You might also implement a mechanism for asynchronous notifications from the MCU to the MPU for real-time monitoring.
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Container Access: If you are using Torizon, you can expose SPI devices to containers using the
--deviceflag in Docker, allowing your containerized applications to access the SPI bus.
For more specific guidance, you would need to refer to the datasheets of your MCU and MPU, as well as any existing documentation on the protocols they support.
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