![]() if stat is 1 or 2, send val1 or val2 else zero reading only, so data sent does not matter SPISettings settingsB(10000000, LSBFIRST, SPI_MODE3) SPISettings settingsA(1000000, MSBFIRST, SPI_MODE1) set up the speed, data order and data mode Incompatible means that they need different SPI_MODE using two incompatible SPI devices, A and B. At the same time, the slave device transmits a bit along the MISO line, and the master listens for it. ![]() The master transmits a bit on the MOSI line, which the slave listens for. So during each SPI clock cycle, a full-duplex data transmission occurs. What does full-duplex communication mean? This means when the clock signal is generated by the master device (and only the master device can do so), both master and slave devices are free to communicate at the same time. This doesn't happen in SPI communication, hence it is faster. In comparison, I2C requires data to be sent in packets - with a limited number of bits each time, as well as a start and stop condition that defines the end of each packet. ![]() Any number of bits can be sent or received in a continuous stream. Why is SPI so much faster than I2C? The unique benefit of SPI is that data can be transferred without interruption. ![]() ![]() While SPI has an unspecified communication speed, it can be implemented at speeds of 10 Mbps or more. Secondly, SPI supports higher speed full-duplex communication than I2C. ![]()
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