xr20m1172 SPI转串口芯片linux驱动

xr20m1172 串口扩展芯片 Linux 驱动 The XR20M11721 is a high performance two channel universal asynchronous receiver and transmitter (UART) with 64 byte TX and RX FIFOs and a selectable I2C/SPI slave interface. The XR20M1172 operates from 1.62 to 3.63 volts.