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Raspberry pi as a SPI slave

OriolPascual

Hi,

I need to configure a setup to have two SPI buses, with the Raspberry Pi acting as the slave in both cases. Despite searching extensively, I couldn't find any information on how to achieve this.

My conclusion is that the Raspberry Pi might not be designed for this specific use case, as it seems reluctant to operate as a slave device. However, I'm reaching out to see if anyone has managed to configure it in this way and if there are any resources or documentation available that could help me achieve this configuration.

Any guidance or insights would be greatly appreciated.

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  • SPI slave is just an unusual interface configuration for such a system, so the options will have limitations (which you might or might not be able to live with), as you can see from the links Doug found for you. Just curious, what's the actual application?

    If you're looking for high-speed ways of interfacing, then there are interfaces like PCIe, or more longer-distant options like Ethernet or WiFi, very convenient since every Pi has a network interface of some sort.

    If you don't care for high throughout then there's UART. One SBC that could certainly do SPI slave (and do it with high performance) is BeagleBone Black with it's special hardware called PRU. But Pi doesn't have that.

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  • SPI slave is just an unusual interface configuration for such a system, so the options will have limitations (which you might or might not be able to live with), as you can see from the links Doug found for you. Just curious, what's the actual application?

    If you're looking for high-speed ways of interfacing, then there are interfaces like PCIe, or more longer-distant options like Ethernet or WiFi, very convenient since every Pi has a network interface of some sort.

    If you don't care for high throughout then there's UART. One SBC that could certainly do SPI slave (and do it with high performance) is BeagleBone Black with it's special hardware called PRU. But Pi doesn't have that.

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