SoftwareSerial Causing bad reading ?

i'm using arduino mini, since doesn't have uart port left. thought use softwareserial, turned out not good. making hardware serial read bad data.

for example, if upload following code, , open serialmonitor , write text longer 4 characters, trim middle text. 123456789, read 123789. if comment line "myserial.write(buffer2,toread);" works expected. there anyway fix ?

code: [select]

#include <softwareserial.h>

softwareserial myserial(5, 6); // rx, tx

void setup() {
  // open serial communications , wait port open:
  serial.begin(57600);
  while (!serial) {
    ; // wait serial port connect. needed native usb port only
  }
  // set data rate softwareserial port
  myserial.begin(9600);
  myserial.println("hello, world?");
}

void loop() { // run on , over
  //if (myserial.available()) {
 //   serial.write(myserial.read());
 // }
  if (serial.available()) {
    int toread = serial.available();
    byte buffer2[256];
    serial.readbytes(buffer2, toread) ;
    myserial.write(buffer2,toread);
    serial.write(buffer2,toread);
  }
}

softwareserial disables interrupts entire time transmitting each character.  this means transmitting 1 character myserial.write preventing serial saving 57600/9600, or 6 characters.  the uart can buffer 2 of them before serial gets them, explains 4 lost chars.

the best way have second serial port altsoftserial on pins 8 & 9.

next best neoswserial on other pins, @ bauds 9600, 19200 , 38400.

worst softwareserial.  

cheers,
/dev

Arduino Forum > Using Arduino > Networking, Protocols, and Devices (Moderator: fabioc84) > SoftwareSerial Causing bad reading ?

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