Having Major Issues getting ESP32 to read serial response please help

Projects General Guidance
1

Hi Everybody Kinda New at This.

The Project:

Get an ESP32 to send a Read All Serial Command(#01A) to a Digital Current Transducer Every Second and Read the Transducers Serial Response.

The Problem:

I am currently sending the command and getting a response but cannot figure out how to get the ESP32 to read the response and print to serial monitor. All help very appreciated.

Current Code Below:

#define LED 36 //Declare LED pin
#define MASTER_EN 37 //Pin 37 connected to RS485 Enable pin
#define MASTER_DI 3
#define MASTER_RO 1

char incomingByte = 0;

void setup() {
// put your setup code here, to run once:
pinMode(LED , OUTPUT); // Declare LED pin as OUTPUT
pinMode(MASTER_EN, OUTPUT);
pinMode(MASTER_RO, INPUT);
pinMode(MASTER_DI, OUTPUT);
Serial.begin(9600);
digitalWrite(MASTER_EN , LOW);

}

void loop() {
// put your main code here, to run repeatedly:
incomingByte = Serial.read();
digitalWrite(MASTER_EN , HIGH);
delay(5);
Serial.write("#01A\r");
digitalWrite(MASTER_EN , LOW);
delay(5);
Serial.read();
delay(2000);
digitalWrite(MASTER_EN , HIGH);

Serial.read();
delay(1000);
Serial.flush();
digitalWrite(MASTER_EN , LOW);
delay(1000);
}

2

Notice how the code, below, is in code tags and well formatted?

In declarations

#include <HardwareSerial.h>
HardwareSerial GPSSerial ( 1 );
HardwareSerial LIDARSerial ( 2 );

In setup()

  LIDARSerial.begin ( SerialDataBits, SERIAL_8N1, 26, 25 );
  GPSSerial.begin ( GPS_DataBits, SERIAL_8N1, 2, 15 ); // begin GPS hardware serial

One function using serial one serial port.

void fGPS_Parse(  void *pvParameters )
{
  // int iBit = 1;
  for (;;)
  {
    xEventGroupWaitBits (eg, evtGPS_Parse, pdTRUE, pdTRUE, portMAX_DELAY) ;
    if ( xSemaphoreTake( sema_GPS_Gate, xTicksToWait0 ) == pdTRUE )
    {
      //query GPS: has a new complete chunk of data been received?
      if ( GPSSerial.available() > 1 )
      {
        if ( GPS.encode(GPSSerial.read()) )
        {
          if (  GPS.location.isValid())
          {
            if ( xSemaphoreTake( sema_Posit, xSemaphoreTicksToWait ) == pdTRUE )
            {
              xPosit.Lat = GPS.location.lat();// store data into structure
              xPosit.Lon = GPS.location.lng();
              xSemaphoreGive( sema_Posit );
            }
          } // if (  GPS.location.isValid())
          if (GPS.speed.isValid())
          {
            if ( xSemaphoreTake( sema_Posit, xSemaphoreTicksToWait ) == pdTRUE )
            {
              xPosit.MPH = GPS.speed.mph();
              xPosit.KPH = GPS.speed.kmph();
              xSemaphoreGive( sema_Posit );
            }
          } //  if (GPS.speed.isValid())
          if (GPS.time.isValid())
          {
            if ( xSemaphoreTake( sema_Time, xSemaphoreTicksToWait ) == pdTRUE )
            {
              xTime.iSeconds = GPS.time.second();
              xTime.iMinutes = GPS.time.minute();
              xTime.iHours = GPS.time.hour();
              xSemaphoreGive( sema_Time );
            }
          } // if (GPS.time.isValid())
          if (GPS.date.isValid())
          {
            if ( xSemaphoreTake( sema_Date, xSemaphoreTicksToWait ) == pdTRUE )
            {
              xDate.iMonth = GPS.date. month();
              xDate.iDay = GPS.date.day();
              xDate.iYear = GPS.date.year();
              xSemaphoreGive( sema_Date );
            }
          } // if (GPS.date.isValid())
          if (  GPS.altitude.isValid() )
          {
            if ( xSemaphoreTake( sema_Posit, xSemaphoreTicksToWait ) == pdTRUE )
            {
              xPosit.Alti = GPS.altitude.meters();
              xSemaphoreGive( sema_Posit );
            }
          } //  if (  GPS.altitude.isValid() )
          if ( GPS.course.isUpdated() )
          {
            if ( xSemaphoreTake( sema_Posit, xSemaphoreTicksToWait ) == pdTRUE )
            {
              xPosit.Hdg = GPS.course.deg();
              xSemaphoreGive( sema_Posit );
            }
          } // if ( GPS.course.isUpdated() )
          if ( xSemaphoreTake( sema_Posit, xSemaphoreTicksToWait ) == pdTRUE )
          {
            xQueueOverwrite( xQ_Posit, (void *) &xPosit );
            xSemaphoreGive( sema_Posit );
          }
        } // if ( GPS.encode(GPSSerial.read()))
      } // if ( GPSSerial.available() > 0 )
      xSemaphoreGive( sema_GPS_Gate );
    }
  } // for (;;)
  vTaskDelete( NULL );
} // void fGPS_Parse(  void *pvParameters )

Another function using the other serial port

void fReceiveSerial_LIDAR( void * parameters  )
{
  bool BeginSentence = false;
  char OneChar;
  char *str;
  str = (char *)ps_calloc(300, sizeof(char) ); // put str buffer into PSRAM
  // log_i("Free PSRAM before String: %d", ESP.getFreePsram());
  for ( ;; )
  {
    EventBits_t xbit = xEventGroupWaitBits (eg, evtReceiveSerial_LIDAR, pdTRUE, pdTRUE, portMAX_DELAY);
    if ( LIDARSerial.available() >= 1 )
    {
      while ( LIDARSerial.available() )
      {
        OneChar = LIDARSerial.read();
        if ( BeginSentence )
        {
          if ( OneChar == '>')
          {
            if ( xSemaphoreTake( sema_ParseLIDAR_ReceivedSerial, xSemaphoreTicksToWait10 ) == pdTRUE )
            {
               xQueueOverwrite( xQ_LIDAR_Display_INFO, ( void * ) &str );
              xEventGroupSetBits( eg, evtParseLIDAR_ReceivedSerial );
              //
            }
            BeginSentence = false;
            break;
          }
          strncat( str, &OneChar, 1 );
        }
        else
        {
          if ( OneChar == '<' )
          {
            strcpy( str, ""); // clear string buffer
            BeginSentence = true; // found beginning of sentence
          }
        }
      } //  while ( LIDARSerial.available() )
    } //if ( LIDARSerial.available() >= 1 )
    xSemaphoreGive( sema_ReceiveSerial_LIDAR );
    //        log_i( "fReceiveSerial_LIDAR " );
    //        log_i(uxTaskGetStackHighWaterMark( NULL ));
  }
  free(str);
  vTaskDelete( NULL );
} //void fParseSerial( void * parameters  )

Using 2 of the 3 serial ports on a ESP32