Hackaday.io hacker [ajlitt] is looking ... s taking up the SPI lines. Connect the SPI lines on the ESP8266 to the SDIO lines on the Raspberry Pi, and the rest is taken care of by the drivers.

WIZnet W6300-EVB-Pico2 is a development board that combines a Raspberry Pi RP2350 MCU with the company's new W6300 QSPI ...

an SPI bus, and a PS/2 keyboard connector to boot. [Martin K] has a video where the finished system is enclosed in a Raspberry Pi case and has an I2C OLED display attached and working.

an IO Case, a Cooler, an Antenna Kit, and a Development Kit. You can read more about those accessories in Raspberry Pi's announcement. If you want to buy Compute Module 5, you can do so by heading ...

All mainline Raspberry Pi boards share the same 40 GPIO pin layout and can be used to control peripherals via the UART, SPI, and I2C buses ... are used for digital IO, 6 are exclusively used ...