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- Implemented core SPI driver supporting Klipper's SPI protocol for both hardware and software communication. - Added commands: `config_spi`, `spi_set_bus`, `spi_transfer`, `spi_send`, `config_spi_without_cs`, and `config_spi_shutdown`, with response handling for `spi_transfer_response`. - Developed platform-agnostic HAL interface for SPI (`SPIDriver` and `SoftwareSPIDriver`), integrated RP2040-specific implementations using TinyGo's `machine.SPI` API and software bit-banging. - Updated emergency shutdown to send configured messages to SPI devices automatically. - Included detailed documentation (`spi.md`) covering implementation architecture, Klipper protocol commands, hardware configurations, and example usage. - Updated RP2040 main initialization to register SPI drivers and commands.
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config_spi,spi_set_bus,spi_transfer,spi_send,config_spi_without_cs, andconfig_spi_shutdown, with response handling forspi_transfer_response.SPIDriverandSoftwareSPIDriver), integrated RP2040-specific implementations using TinyGo'smachine.SPIAPI and software bit-banging.spi.md) covering implementation architecture, Klipper protocol commands, hardware configurations, and example usage.