I2C (Inter-Integrated Circuit)： 一种同步多主多从串行通信协议 ... 误差累积：长时间传输可能出现同步误差。 应用场景： UART、RS-232。 同步通信适用于需要高效、高速数据传输的场景，但通常需要额外的硬件支持。 异步通信适合简单低速应用，易于实现和调试。

To the average microcontroller, Ethernet networks are quite a step up from the basic I2C, SPI and UART interfaces, requiring either a built-in Ethernet MAC or SPI-based MAC, with tedious ...

the Raspberry Pi 4 has six SPI controllers, six I2C controllers, and six UARTs – all on its 40-pin header. You can’t make use of all of these at once, but with up to four different connections ...