Serial out on the Feather 32u4

Other Hardware 3rd Party Boards
1

Hello,

I have a question on the feather 32u4 and serial

I have connected the Feather 32u4 to the Feather wing RTC

and all is well in that it allows me to send the data to the terminal (serial)

but I am trying to send the data to the due using the due serial 3 but it does not seem to work in that it does not receive any data.

so since it was not working so I thought it would be easier to test the feather with serial in a loop

well that has not gone very well.

I set to software serial coms, one port 5/6 and one 11/12

so i send data out on 5/6 and wait on 11/12

it does not seem to work.

  1. so does the feather 32u4 support softwareserial
  2. are there designated pins that need to be used
  3. is there a version of hardware serial on these boards and is there and example

(I would like to leave the tx/rx (Pins 0/1)serial along for debug purposes)

in the end, i simply wish to send the output of the clock to the due

Here is the output of the code:

2018/5/21 (Monday) 16:19:59

before Sending data on Clock_serial
after Sending data on Clock_serial
2018/5/21 (Monday) 16:20:2

before Sending data on Clock_serial
after Sending data on Clock_serial
2018/5/21 (Monday) 16:20:5

before Sending data on Clock_serial
after Sending data on Clock_serial
2018/5/21 (Monday) 16:20:8

before Sending data on Clock_serial
after Sending data on Clock_serial

and here is the code:

// Date and time functions using a DS3231 RTC connected via I2C and Wire lib
#include <Wire.h>
#include "RTClib.h"
#include <SoftwareSerial.h>


RTC_DS3231 rtc;

char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

 SoftwareSerial Clock_Serial(5, 6); // RX, TX
 SoftwareSerial Clock_Serial_test(11, 12); // RX, TX

void setup () {

#ifndef ESP8266
  while (!Serial); // for Leonardo/Micro/Zero
#endif

  Clock_Serial.begin(9600);
  Clock_Serial_test.begin(9600);
  Serial.begin(9600);

  delay(3000); // wait for console opening

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

 if (rtc.lostPower()) {
    Serial.println("RTC lost power, lets set the time!");
    // following line sets the RTC to the date & time this sketch was compiled
    //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
     rtc.adjust(DateTime(2018,5,10,11,53,00));
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
    // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
 }
}

void loop () {
    DateTime now = rtc.now();
    
    Serial.print(now.year(), DEC);
    Serial.print('/');
    Serial.print(now.month(), DEC);
    Serial.print('/');
    Serial.print(now.day(), DEC);
    Serial.print(" (");
    Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
    Serial.print(") ");
    Serial.print(now.hour(), DEC);
    Serial.print(':');
    Serial.print(now.minute(), DEC);
    Serial.print(':');
    Serial.print(now.second(), DEC);
    Serial.println();

      Serial.println("");
     Serial.println("before Sending data on Clock_serial");  
     
   while(Clock_Serial.available() > 0) 
    {
  
   Serial.println("Sending data on Clock_serial");
   
   Clock_Serial.write("Hello");
   while( Clock_Serial.available() > 0)
   {
   Serial.println("reading: " + Clock_Serial.read());
   }
    delay(1000);
    }
    
     Serial.println("after Sending data on Clock_serial");  
       
    // calculate a date which is 7 days and 30 seconds into the future
    DateTime future (now + TimeSpan(7,12,30,6));
    
    delay(3000);
}
2

The Arduino documentation for Leonardo/Micro boards applies to the Feather 32U4. So we only need to consult the SoftwareSerial library's documentation:
https://www.arduino.cc/en/Reference/SoftwareSerial

Not all pins on the Leonardo and Micro support change interrupts, so only the following can be used for RX: 8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI).

3

jkane:
(I would like to leave the tx/rx (Pins 0/1)serial along for debug purposes)

Unlike other Arduino boards, pins 0 and 1 are Serial1, a hardware serial port. Serial uses the native USB capabilities of the ATmega32U4.

4

So

Serial1.begin(9600) would output to another microcontroller

on the feather side

if (Serial1.avaiable()) // pins 0 and 1
{
Serial1.write("Hello from the data and time keeper");
delay(1000);
}

on the due side

if (Serial3.avaiable())
Serial.println(Serial3.read()) // testing to terminal