UART A2/3 not working - Nano

Projects Programming
1

What's wrong with the following program? I can see the output of A3 (Tx) in the picocom terminal, but when I type something, it is not seen as input in mySerial Rx.

#include <LiquidCrystal.h>
#include <SoftwareSerial.h>


int c='A';

// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
SoftwareSerial mySerial = SoftwareSerial(A2, A3);
SoftwareSerial midiSerial = SoftwareSerial(A0, A1); // RX, TX

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, LOW);
  
 
  mySerial.begin(9600);
  midiSerial.begin(31250);
 
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("MIDI-Channel   1");
  
}

void loop() {
  
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  char str[4];
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  //lcd.print(millis() / 1000);
 
  delay(1000);
  if(mySerial.available() > 0)
    c=mySerial.read();
  sprintf(str,"%c",c);
  lcd.print(str);
  midiSerial.write(c);
  mySerial.write(c);
}
2

i've had problems trying to get 2 SoftwareSerial interfaces working at the same time

3

You don't say which Arduino you are using, but using SoftwareSerial at 31250 baud might be pushing it a bit.

4

Forgot to mention, Nano (changed the subject accordingly).

5

You are trying to sue 2 instances of SoftwareSerial and I have never seen anyone get this working except under perfect conditions and never with real data

There is a SoftwareSerial listen()) function to set which instance is currently being used but you have not used it in your sketch

6

Using two SoftwareSerial in the code is definitely not a beginner's level.
Why do you not use hardware Serial for one of input? As I see it not in the code

7

I modified the code and this way it seems to work:

void loop() {
  
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  char str[4];
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  //lcd.print(millis() / 1000);
 
  delay(1000);
  mySerial.listen();
  if(mySerial.isListening())
    if(mySerial.available() > 0)
       c=mySerial.read();
  sprintf(str,"%c",c);
  lcd.print(str);
  midiSerial.write(c);
  mySerial.write(c);
}

@b707 : "Why do you not use hardware Serial for one of input? As I see it not in the code"

Because I was recommended (here in this forum) to not tinker with the hardware uart (it seems to interfere with the programming interface).

8

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