Sharing SPI bus – discussion involving W5500 on the Raspberry Pi Pico
A maker described a hardware scenario where two SPI devices (W5500 Ethernet module) share the same MOSI/MISO/CLK lines but have separate chip-select (CS) pins.
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Project description
🔍 Overview A maker on the Raspberry Pi forums described a hardware scenario in which two SPI devices (one being the W5500 Ethernet module) share the same MOSI/MISO/CLK lines but have separate chip-select (CS) pins. The discussion evolves into a deep technical conversation around whether this is viable, what constraints exist on the SPI bus for the RP2040/Pico environment, and how W5500 performs in that scenario. 💬 Key Discussion Points The original poster wrote: “I am intending to use SPI#0 for a Wiznet W5500 module (wired ethernet), and … I’m designing carrier boards which I can plug a…
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