Allows normal IO pins to be used as bit bashed UART pins

Resources

https://www.arduino.cc/en/Reference/SoftwareSerial

http://arduiniana.org/libraries/newsoftserial/

Example Usage

#include <SoftwareSerial.h>

SoftwareSerial mySerial(8, 7); // RX=pin #, TX=pin #
//This also works:
//SoftwareSerial mySerial(PA2, PA3); // RX=pin #, TX=pin #


void audio_init (void)
{
  //Set the baud rate for the SoftwareSerial port
  mySerial.begin(9600);
  mySerial.println("Hello, world?");
}



void tx_packet (void)
{
  byte tx_data[4];

  mySerial.write("Hello");

  tx_data[0] = 0x00;
  tx_data[1] = 0x01;
  tx_data[2] = 0x02;
  tx_data[3] = 0x03;
  mySerial.write(&tx_data[0], 4);
}

Receiving Data

Note you can define unlimited software serial ports, but only 1 can be set to receive at a time.

  //Enable RX (will occur in background using irq's)
  mySerial.listen();

  //....


  while (mySerial.available() > 0)
  {
    char data = mySerial.read();
  }

//or:
  char data = mySerial.read();
  if (data != -1)
  {
    //Byte received
  }

Using only 1 pin

Using for RX only

Defining both pins as PA5 on an ATtiny841 and using to receive worked for us.

Compatibility

ATtiny841

RX on pin 2 (RB2) would not work (no explanation found as to why).
RX on pin 5 (PA5) works.

USEFUL?
We benefit hugely from resources on the web so we decided we should try and give back some of our knowledge and resources to the community by opening up many of our company’s internal notes and libraries through mini sites like this. We hope you find the site helpful.
Please feel free to comment if you can add help to this page or point out issues and solutions you have found, but please note that we do not provide support on this site. If you need help with a problem please use one of the many online forums.

Comments

Your email address will not be published.