Software Serial Arduino Library4/17/2021
The native serial support happens via a piece of hardware (built into the chip) called a UART.This hardware allows the Atmega chip to receive serial communication even while working on other tasks, as long as there room in the 64 byte serial buffer.
Software Serial Arduino Library Serial Support HappensSoftware Serial Arduino Library Software Serial PortsIt is possible to have multiple software serial ports with speeds up to 115200 bps. A parameter enables inverted signaling for devices which require that protocol. AltSoftSerial overcomes a number of other issues with the core SoftwareSerial, but has its own limitations. On some Arduinos, there are extra HardwareSerial ports, called Serial1, Serial2, etc. Only one instance is allowed, and it is must be used on one of the Input Capture pins (pins 8 9 for a Nano). It works on any two pins, but only at baud rates 9600, 19200 and 38400. It disables interrupts for the entire time that a character is being sent OR received, and it cannot do both at the same time (unlike all the other serial choices). This can interfere with other parts of your sketch, other device communications, or with libraries. Although AltSoftSerial and SoftwareSerial allow that baud rate, they may not sendreceive data correctly. Unless you are using an ISP, you will have to disconnect the device to upload a new sketch over USB. ![]() The Serial Monitor or other Terminal emulator program will read from that USB COM port. You probably dont need to handle each character in an interrupt. Just use AltSoftSerial and call the available() and then read() if a char is ready. Similarly, NeoHWSerial adds the same attachInterrupt feature to the core HardwareSerial. However, NeoSWSerial is a completely different class (it also has the attachInterrupt feature). Software serial must receive all bits, one by one, so you must read a digital port, wait a specific time and read the digital pin again. You must make it 10 times (1 start bit, 8 data bits and 1 end bit). For use a software serial you need to worry more about performance. Provide details and share your research But avoid Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. Not the answer youre looking for Browse other questions tagged serial arduino-nano uart or ask your own question.
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