Introduction - If you have any usage issues, please Google them yourself
2812 to implement the SPI loopback test mode, SPI spontaneous self-closing, send and receive be achieved using query will SPISIMO and SPISOMI internal short two pins to achieve the spontaneous self-collection mode. SPI will be 0-99 issued by one of these 100 numbers, and then one by one to receive into Spi_VarRx [].