RS232 Industruino only sending over Serial1 (or any other?) not receiving

Hi,

Help is appreciated with a problem that can be summarised as "I can only send over serial but not received anything".

The RS232 setting :

• an IND.I/0 D21G (serial number AR0003587)
  • via Serial1 by using (D10/D5 & ISO2 GND) and a TTL-to-USB cable connected to my workstation
  • powered via USB by same workstation.
  • using Serial1 in the program for communication
• no other connections are made on the Industruino.
• a basic program uploaded (see infra) that
  • echo's over serial what is read over that same serial connection
  • in addition for each 10 bytes received and each 500.000th iteration, it will send a message through serial + print it on the LCD screen.
• to observe what is send over that serial port I use on a linux workstation in a terminal window

    cat /dev/ttyACM0

•  to sent something, I launch in another terminal window

    echo "Hello" > /dev/ttyACM0

Observations :

• all messages from Industruino to the workstation are seen on screen
• no messages sent to the Arduino are echoed,
  • is confirmed by the 'bytes received counter' which  is not increased
  • I assume they never arrive? but why? Did rechecked I did not by accident misplaced D10 RX.

Alternatives tried :

• I used a regular Arduino Mega to verify if there was not error somehow made in the setup
  • this functions as expected the "Hello" text is echoed in the terminal, like the other messages too
• Instead of Serial1, I tried to communicate via SerialUSB
  • it receives nothing what I sent
  • but the behaviour is not the same. When I start to monitor it with 'cat /dev/ttyACM0' on the LCD and what is echoed shows it is receive a lot
  • what is echoed of what seems to be received are 'related fragments' of what is sent.
  • Is this maybe related to the cause of my problem?

Any help is welcome as I am out of ideas how to proceed?

Kind regards
Mario

------ the program itself --------------

#include "Arduino.h"
#include <stdlib.h>
#include <limits.h>

#define ARDUINO_BAUD_RATE 9600
#define SERIALOBJ Serial1
#define INDUSTRUINO

#ifdef INDUSTRUINO
    #include <Arduino.h>
    #include <Indio.h>
    #include <Wire.h>
    #include <U8g2lib.h>

    static U8G2_UC1701_MINI12864_F_2ND_4W_HW_SPI u8g2(U8G2_R2, /* cs=*/ 19, /* dc=*/ 22);

    #define LCD_PIXELS_WIDTH 128
    #define LCD_PIXELS_HEIGHT 64
    #define CHARACTER_WIDTH 4
    #define CHARACTER_HEIGHT 6
    U8G2LOG lcdlog;
    #define U8LOG_WIDTH LCD_PIXELS_WIDTH/CHARACTER_WIDTH
    #define U8LOG_HEIGHT LCD_PIXELS_HEIGHT/CHARACTER_HEIGHT
    uint8_t u8log_buffer[U8LOG_WIDTH*U8LOG_HEIGHT];
    const int backlightPin = 26; // PWM output pin that the LED backlight is attached to
    int backlightIntensity = 4;        // LCD backlight intesity
#endif

unsigned long int counter = 0;
unsigned long int nm_rvcd = 0;

void setup() {
    #ifdef INDUSTRUINO
        pinMode(backlightPin, OUTPUT); //set backlight pin to output
        analogWrite(backlightPin, (map(backlightIntensity, 5, 1, 255, 0))); //convert backlight intesity from a value of 0-5 to a value of 0-255 for PWM.

        u8g2.begin();
        // set the font for the terminal window
        // small
        u8g2.setFont(u8g2_font_tom_thumb_4x6_mf);
        // large
      //  u8g2.setFont(u8g2_font_amstrad_cpc_extended_8f);
        lcdlog.begin(u8g2, U8LOG_WIDTH, U8LOG_HEIGHT, u8log_buffer);    // connect to u8g2, assign buffer
        lcdlog.setLineHeightOffset(0);    // set extra space between lines in pixel, this can be negative
        lcdlog.setRedrawMode(0);        // 0: Update screen with newline, 1: Update screen for every char
    #endif
    SERIALOBJ.begin(ARDUINO_BAUD_RATE);
}

void loop() {
   if (SERIALOBJ.available()) {
     nm_rvcd++;
     // pure echo
     SERIALOBJ.write(SERIALOBJ.read());
   }
   if (((nm_rvcd % 10)==0) && (nm_rvcd>0)) {
       SERIALOBJ.print("Total received : ");
       SERIALOBJ.println(nm_rvcd, DEC);
       #ifdef INDUSTRUINO
           lcdlog.print("Total received : ");
           lcdlog.print(nm_rvcd);
           lcdlog.print("\n");
       #endif
   }
   counter++;
   if ((counter % 500000)==0) {
       SERIALOBJ.print("Counter : ");
       SERIALOBJ.println(counter, DEC);
       #ifdef INDUSTRUINO
           lcdlog.print("Counter : ");
           lcdlog.print(counter);
           lcdlog.print("\n");
       #endif
   }
}

----- SerialUSB apparently receiving rubrish that resembles what it has sent -------
[mario@workstation]$ cat /dev/ttyACM0
Counter : 6500000

Counter Total received : 1040

: 6500000
Total received : 1050

Couner T1Total received : 1060

0465000010Total received : 1070

5Cone T104Total received : 1080

6500010T

Total received : 1090

one T104Total received : 1100

To00010T

Total received : 1110

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Mario Vackier

Mario Vackier

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Asked on 12/9/21, 9:29 PM

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