None of that covers the SPI port found on most all or maybe all AVR microcontrollers. Some other AVR chips that you can build into custom Arduinos have one, two, or more and some have hardware serial ports that are not full UART but still very capable. Some even have message queue to store received bytes until the CPU can get to them.Īrduino UNO has one UART, usually used by the USB to PC connection. You only use the functions to read, write or print normally.Ī hardware serial port, often a UART (universal asynchronous receiver transmitter) also handles all the bits on its own without CPU attention. What does it mean by software UART? i mean there must be some coding in arduino to place start and stop bits? can u help me with coding? and Also how to accept only that data which starts with my defined start bit? others must be rejected!Īrduino has a SoftwareSerial library that lets you use 2 pins to send and receive serial communications without a hardware serial port.
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