<div dir="ltr">Really clear explanation of SPI, <a href="https://hackaday.com/2021/09/16/taking-a-deep-dive-into-spi/">https://hackaday.com/2021/09/16/taking-a-deep-dive-into-spi/</a>.<div><br></div><div>Regards,</div><div>Doug P.</div></div>