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Suppose keyboard and mouse not working . Processor has option to choose spi, i2c , can and rs232 why to choose spi. How to choose baud rate for spi in case of led blinking.
SPI is short distance communication technology if you want more detail please visit here https://www.engineersgarage.com/articles/spi-what-serial-peripheral-interface-protocol
This article may help you https://www.engineersgarage.com/articles/spi-what-serial-peripheral-interface-protocol
please ask is any doubt ……