Add functions in a .h file

[Merdock1]

Hi Emiliano.
Would it be possible to add these tools in a .h file?
are the functions of separating, joining records.
and also add the reading and writing of a register, bit by bit.
Here the code that should go in the file.h
Here an example is used with modbus tcp.

#pragma once
#ifndef MB_SPLIT_MERGE_H
#define MB_SPLIT_MERGE_H
#include <Arduino.h>

bool mb_b00 = LOW;
bool mb_b01 = LOW;
bool mb_b02 = LOW;
bool mb_b03 = LOW;
bool mb_b04 = LOW;
bool mb_b05 = LOW;
bool mb_b06 = LOW;
bool mb_b07 = LOW;
bool mb_b08 = LOW;
bool mb_b09 = LOW;
bool mb_b10 = LOW;
bool mb_b11 = LOW;
bool mb_b12 = LOW;
bool mb_b13 = LOW;
bool mb_b14 = LOW;
bool mb_b15 = LOW;

unsigned int MB_Var_to_bit_read(uint16_t mb_var, uint8_t n_bit)
{
    bool value_bit;
    value_bit = bitRead(mb_var, n_bit);
    return value_bit;
}

unsigned int MB_Var_to_bit_write(uint16_t mb_var, int16_t n_bit, bool value_bit)
{
    
    bitWrite(mb_var, n_bit, value_bit);
    return mb_var;
}

// https://industruino.com/blog/our-news-1/post/modbus-tips-for-industruino-26#blog_content

/*
 * INDUSTRUINO ModBus help (D21G)
 * modbus registers are 16-bit unsigned integers
 * to pass a float variable (32-bit), it needs to be split into 2 registers
 * use the below functions to achieve this
 * Tom Tobback Nov 2017
 */

/* FLOAT TYPE 32 */
unsigned int f32_split_uint16_1(float float32_number)
{ // split the float and return first unsigned integer

    union f32_2uint
    {
        float f;
        uint16_t i[2];
    };

    union f32_2uint f32_number;
    f32_number.f = float32_number;

    return f32_number.i[0];
}

unsigned int f32_split_uint16_2(float float32_number)
{ // split the float and return second unsigned integer

    union f32_2uint
    {
        float f;
        uint16_t i[2];
    };

    union f32_2uint f32_number;
    f32_number.f = float32_number;

    return f32_number.i[1];
}

// reconstruct the float 32 from 2 unsigned integers
float _2uint16_merge_f32(unsigned int uint16_1, unsigned int uint16_2)
{ 
    union f32_2uint
    {
        float f;
        uint16_t i[2];
    };

    union f32_2uint f32_number;
    f32_number.i[0] = uint16_1;
    f32_number.i[1] = uint16_2;

    return f32_number.f;
}


/*
 * INDUSTRUINO ModBus help (D21G)
 * modbus registers are 16-bit unsigned integers
 * to pass a long variable (32-bit), it needs to be split into 2 registers
 * use the below functions to achieve this
 * Tom Tobback Nov 2017
 */

/* LONG TYPE(with sign) 32 */
unsigned int l32_split_uint16_1(long long_number)
{ // split the long and return first unsigned integer

    union l_2uint
    {
        long l;
        uint16_t i[2];
    };

    union l_2uint l_number;
    l_number.l = long_number;

    return l_number.i[0];
}

unsigned int l32_split_uint16_2(long long_number)
{ // split the long and return second unsigned integer

    union l_2uint
    {
        long l;
        uint16_t i[2];
    };

    union l_2uint l_number;
    l_number.l = long_number;

    return l_number.i[1];
}

long _2uint16_merge_l32(unsigned int uint16_1, unsigned int uint16_2)
{ // reconstruct the long from 2 unsigned integers

    union l_2uint
    {
        long l;
        uint16_t i[2];
    };

    union l_2uint l_number;
    l_number.i[0] = uint16_1;
    l_number.i[1] = uint16_2;

    return l_number.l;
}



#endif

sample code:

#include <Arduino.h>

#include "mb_split_merge.h"
#include <esp_wifi.h>
#include <WiFi.h>
#include "ModbusIP_ESP8266.h"
#include "AsyncTCP.h"
#include "ESPAsyncWebServer.h"
#include "AsyncElegantOTA.h"

const char *ssid = "you_SSID";
const char *password = "password.";
// const char *hostname = "Caudalimetro";
String hostname = "TestModbus";

//// Se configuran los parametros de RED  ///

IPAddress local_IP(10, 10, 10, 10);
IPAddress gateway(10, 10, 10, 1);
IPAddress subnet(255, 255, 255, 0);
IPAddress primaryDNS(10, 10, 10, 1);
IPAddress secondaryDNS(8, 8, 8, 8);

void ConnectWiFi_STA(bool useStaticIP = false)
{
  Serial.println("");
  WiFi.mode(WIFI_STA);
  WiFi.config(INADDR_NONE, INADDR_NONE, INADDR_NONE, INADDR_NONE);
  WiFi.setHostname(hostname.c_str()); // define hostname
  // wifi_station_set_hostname(hostname);

  WiFi.begin(ssid, password);
  if (useStaticIP)
  {
    WiFi.config(local_IP, gateway, subnet, primaryDNS, secondaryDNS);
  }
  Serial.print("Conectando");
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(100);
    Serial.print('.');
  }

  Serial.println("");
  Serial.print("Iniciado STA:\t");
  Serial.println(ssid);
  Serial.print("IP address:\t");
  Serial.println(WiFi.localIP());
  Serial.print("Wi-Fi MAC: ");
  Serial.println(WiFi.macAddress());
  Serial.print("Wi-Fi Channel: ");
  Serial.println(WiFi.channel());
  Serial.print("RRSI: ");
  Serial.println(WiFi.RSSI());
  Serial.println("");
  delay(200);
}

enum mbip_registro
{

  NR_32f_LSB,
  NR_32f_MSB,
  NR_32l_LSB,
  NR_32l_MSB,
  NR_16b_to_b,

  NR_IP_TOTAL_REGISTER,

};

uint16_t VAR_32f_LSB = 0;
uint16_t VAR_32f_MSB = 1;
uint16_t VAR_32l_LSB = 2;
uint16_t VAR_32l_MSB = 3;
uint16_t VAR_16b_to_b = 4;

float VAR_32f_MSB_LSB = 0;
long VAR_32l_MSB_LSB = 0;
double VAR_64b_Merge = 0;

ModbusIP mb_ip_cc;

void setup_mb_tcp() //
{
  mb_ip_cc.server();
  // Agrega registros lectura Modbus IP.
  // (registro inicial, valor de registros, cantidad de registros)
  mb_ip_cc.addHreg(0, 0, NR_IP_TOTAL_REGISTER);
}

void loop_write_mb_tcp() // Loop Comunicación Variador 1
{

  mb_ip_cc.Hreg(NR_32f_LSB, VAR_32f_LSB);
  mb_ip_cc.Hreg(NR_32f_MSB, VAR_32f_MSB);
  mb_ip_cc.Hreg(NR_32l_LSB, VAR_32l_LSB);
  mb_ip_cc.Hreg(NR_32l_MSB, VAR_32l_MSB);
  mb_ip_cc.Hreg(NR_16b_to_b, VAR_16b_to_b);

  mb_ip_cc.task();
  yield();
}

void loop_read_mb_tcp() //
{
  VAR_32f_LSB = mb_ip_cc.Hreg(NR_32f_LSB);
  VAR_32f_MSB = mb_ip_cc.Hreg(NR_32f_MSB);
  VAR_32l_LSB = mb_ip_cc.Hreg(NR_32l_LSB);
  VAR_32l_MSB = mb_ip_cc.Hreg(NR_32l_MSB);
  VAR_16b_to_b = mb_ip_cc.Hreg(NR_16b_to_b);

  yield();
}

AsyncWebServer server(80);

void setup_OTA_Update()
{
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request)
            { request->send(200, "text/plain", "Prueba de separar y unir registros Modbus."); });

  AsyncElegantOTA.begin(&server, "Admin", "Admin"); // Start ElegantOTA
  server.begin();
  Serial.println("HTTP server started");
  Serial.println("Usuario: Admin, Pasword: Admin");
  Serial.println("");
  delay(200);
}

void setup()
{
  Serial.begin(115200, SERIAL_8E1);
  ConnectWiFi_STA(true);
  setup_mb_tcp();
  setup_OTA_Update();
}

void loop() 
{
  
  loop_read_mb_tcp();

  // Union of two 16-bit Modbus registers into 1 32-bit float value
  VAR_32f_MSB_LSB = _2uint16_merge_f32(VAR_32f_LSB, VAR_32f_MSB);
  // Union of two 16-bit Modbus registers into 1 32-bit long value
  VAR_32l_MSB_LSB = _2uint16_merge_l32(VAR_32l_LSB, VAR_32l_MSB);

  // Bit by bit reading of a 16 bit modbus register
  mb_b00 = MB_Var_to_bit_read(VAR_16b_to_b, 0);
  mb_b01 = MB_Var_to_bit_read(VAR_16b_to_b, 1);
  mb_b02 = MB_Var_to_bit_read(VAR_16b_to_b, 2);
  mb_b03 = MB_Var_to_bit_read(VAR_16b_to_b, 3);
  mb_b04 = MB_Var_to_bit_read(VAR_16b_to_b, 4);
  mb_b05 = MB_Var_to_bit_read(VAR_16b_to_b, 5);
  mb_b06 = MB_Var_to_bit_read(VAR_16b_to_b, 6);
  mb_b07 = MB_Var_to_bit_read(VAR_16b_to_b, 7);
  mb_b08 = MB_Var_to_bit_read(VAR_16b_to_b, 8);
  mb_b09 = MB_Var_to_bit_read(VAR_16b_to_b, 9);
  mb_b10 = MB_Var_to_bit_read(VAR_16b_to_b, 10);
  mb_b11 = MB_Var_to_bit_read(VAR_16b_to_b, 11);
  mb_b12 = MB_Var_to_bit_read(VAR_16b_to_b, 12);
  mb_b13 = MB_Var_to_bit_read(VAR_16b_to_b, 13);
  mb_b14 = MB_Var_to_bit_read(VAR_16b_to_b, 14);
  mb_b15 = MB_Var_to_bit_read(VAR_16b_to_b, 15);

  // Separation of a 32-bit float value into 2 16-bit values = 2 16-bit modbus registers
  VAR_32f_LSB = f32_split_uint16_1(VAR_32f_MSB_LSB);
  VAR_32f_MSB = f32_split_uint16_2(VAR_32f_MSB_LSB);

  // Separation of a 32-bit long value into 2 16-bit values = 2 16-bit modbus registers
  VAR_32l_LSB = l32_split_uint16_1(VAR_32l_MSB_LSB);
  VAR_32l_MSB = l32_split_uint16_2(VAR_32l_MSB_LSB);

  // Writing to HIGH of bit 7 and bit 14 of a Modbus register
  VAR_16b_to_b = MB_Var_to_bit_write(VAR_16b_to_b, 7, HIGH);
  VAR_16b_to_b = MB_Var_to_bit_write(VAR_16b_to_b, 14, HIGH);

  loop_write_mb_tcp();

  
  Serial.print("Registro 0 = ");
  Serial.println(VAR_32f_LSB);
  Serial.print("Registro 1 = ");
  Serial.println(VAR_32f_MSB);
  Serial.print("Union Reg 0+1 = ");
  Serial.println(VAR_32f_MSB_LSB);
  Serial.println("");
  Serial.print("Registro 2 = ");
  Serial.println(VAR_32l_LSB);
  Serial.print("Registro 3 = ");
  Serial.println(VAR_32l_MSB);
  Serial.print("Union Reg 2+3 = ");
  Serial.println(VAR_32l_MSB_LSB);
  Serial.println("");

  Serial.print("Registro 4 = ");
  Serial.println(VAR_16b_to_b);
  Serial.print("Registro 4 BIN= ");
  Serial.println(VAR_16b_to_b, BIN);
  Serial.print("Registro 4 bit 0 = ");
  Serial.println(mb_b00);
  Serial.print("Registro 4 bit 1 = ");
  Serial.println(mb_b01);
  Serial.print("Registro 4 bit 2 = ");
  Serial.println(mb_b02);
  Serial.print("Registro 4 bit 3 = ");
  Serial.println(mb_b03);
  Serial.print("Registro 4 bit 4 = ");
  Serial.println(mb_b04);
  Serial.print("Registro 4 bit 5 = ");
  Serial.println(mb_b05);
  Serial.print("Registro 4 bit 6 = ");
  Serial.println(mb_b06);
  Serial.print("Registro 4 bit 7 = ");
  Serial.println(mb_b07);
  Serial.print("Registro 4 bit 8 = ");
  Serial.println(mb_b08);
  Serial.print("Registro 4 bit 9 = ");
  Serial.println(mb_b09);
  Serial.print("Registro 4 bit 10 = ");
  Serial.println(mb_b10);
  Serial.print("Registro 4 bit 11 = ");
  Serial.println(mb_b11);
  Serial.print("Registro 4 bit 12 = ");
  Serial.println(mb_b12);
  Serial.print("Registro 4 bit 13 = ");
  Serial.println(mb_b13);
  Serial.print("Registro 4 bit 14 = ");
  Serial.println(mb_b14);
  Serial.print("Registro 4 bit 15 = ");
  Serial.println(mb_b15);
  Serial.println("");
  Serial.println("");
}

[emelianov]

Hello Fernando,

If you want this helper code to be included to the library package I suggest to create example(s) that will include mb_split_merge.h itself and clean minimalistic usage patterns. It would be great if you can create such example(s) as merge request.
I prefer do not include something except Modbus standard implementation to core library code.

[Merdock1]

Thank you for your response Emilano.
Here is a simplified example code.
Please feel free to change the names of variables or functions according to your nomenclature.
Remember that for my part I am very far from being anything resembling a programmer.
Thank you very much for your hard work.

#include <Arduino.h>
/*
  Modbus-Arduino Example - Test Holding Register (Modbus IP ESP8266)
  
  You can get or set this holding register
  Original library
  Copyright by André Sarmento Barbosa
  http://github.com/andresarmento/modbus-arduino

  Current version
  (c)2017 Alexander Emelianov (a.m.emelianov@gmail.com)
  https://github.com/emelianov/modbus-esp8266
*/

#ifdef ESP8266
#include <ESP8266WiFi.h>
#else // ESP32
#include <WiFi.h>
#endif
#include <ModbusIP_ESP8266.h>
#include "mb_split_merge.h"

// ModbusIP object
ModbusIP mb;

// enum is used to name the registration numbers.
enum mbip_registro
{
  NR_32f_LSB,
  NR_32f_MSB,
  NR_32l_LSB,
  NR_32l_MSB,
  NR_16b_to_b,
  NR_IP_TOTAL_REGISTER,
};

// These variables store the values of the 16 bit registers
uint16_t VAR_32f_LSB = 4048;
uint16_t VAR_32f_MSB = 16457;
uint16_t VAR_32l_LSB = 2;
uint16_t VAR_32l_MSB = 32768;
uint16_t VAR_16b_to_b = 16512;

// These variables store the values of the 32 bit registers
float VAR_32f_LSB_MSB = 3.14159;
long VAR_32l_LSB_MSB = -2147483646;

void setup()
{
  Serial.begin(115200);

  WiFi.begin("your_ssid", "your_password");

  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  mb.server();
  // Add the holding registers (Initial register, Initial value, number of registers)
  mb.addHreg(0, 0, NR_IP_TOTAL_REGISTER);

}

void loop()
{
  // Loop read holding registers.
  VAR_32f_LSB = mb.Hreg(NR_32f_LSB);
  VAR_32f_MSB = mb.Hreg(NR_32f_MSB);
  VAR_32l_LSB = mb.Hreg(NR_32l_LSB);
  VAR_32l_MSB = mb.Hreg(NR_32l_MSB);
  VAR_16b_to_b = mb.Hreg(NR_16b_to_b);
  
  //yield();

  // Union of two 16-bit Modbus registers into 1 32-bit float value
  VAR_32f_LSB_MSB = _2uint16_merge_f32(VAR_32f_LSB, VAR_32f_MSB);
  // Union of two 16-bit Modbus registers into 1 32-bit long value
  VAR_32l_LSB_MSB = _2uint16_merge_l32(VAR_32l_LSB, VAR_32l_MSB);

  // Bit by bit reading of a 16 bit modbus register
  /*
  The variables mb_b00 to mb_b15 are already defined as booleans in the .h file
  You can define them with another name or create new ones.
*/
  mb_b00 = MB_Var_to_bit_read(VAR_16b_to_b, 0);
  mb_b01 = MB_Var_to_bit_read(VAR_16b_to_b, 1);
  mb_b02 = MB_Var_to_bit_read(VAR_16b_to_b, 2);
  mb_b03 = MB_Var_to_bit_read(VAR_16b_to_b, 3);
  mb_b04 = MB_Var_to_bit_read(VAR_16b_to_b, 4);
  mb_b05 = MB_Var_to_bit_read(VAR_16b_to_b, 5);
  mb_b06 = MB_Var_to_bit_read(VAR_16b_to_b, 6);
  mb_b07 = MB_Var_to_bit_read(VAR_16b_to_b, 7);
  mb_b08 = MB_Var_to_bit_read(VAR_16b_to_b, 8);
  mb_b09 = MB_Var_to_bit_read(VAR_16b_to_b, 9);
  mb_b10 = MB_Var_to_bit_read(VAR_16b_to_b, 10);
  mb_b11 = MB_Var_to_bit_read(VAR_16b_to_b, 11);
  mb_b12 = MB_Var_to_bit_read(VAR_16b_to_b, 12);
  mb_b13 = MB_Var_to_bit_read(VAR_16b_to_b, 13);
  mb_b14 = MB_Var_to_bit_read(VAR_16b_to_b, 14);
  mb_b15 = MB_Var_to_bit_read(VAR_16b_to_b, 15);

  // Separation of a 32-bit float value into 2 16-bit values = 2 16-bit modbus registers
  VAR_32f_LSB = f32_split_uint16_1(VAR_32f_LSB_MSB);
  VAR_32f_MSB = f32_split_uint16_2(VAR_32f_LSB_MSB);

  // Separation of a 32-bit long value into 2 16-bit values = 2 16-bit modbus registers
  VAR_32l_LSB = l32_split_uint16_1(VAR_32l_LSB_MSB);
  VAR_32l_MSB = l32_split_uint16_2(VAR_32l_LSB_MSB);

  // Writing to HIGH of bit 7 and bit 14 of a Modbus register
  VAR_16b_to_b = MB_Var_to_bit_write(VAR_16b_to_b, 7, HIGH);
  VAR_16b_to_b = MB_Var_to_bit_write(VAR_16b_to_b, 14, HIGH);

  // loop Writing holding registers.
  mb.Hreg(NR_32f_LSB, VAR_32f_LSB);
  mb.Hreg(NR_32f_MSB, VAR_32f_MSB);
  mb.Hreg(NR_32l_LSB, VAR_32l_LSB);
  mb.Hreg(NR_32l_MSB, VAR_32l_MSB);
  mb.Hreg(NR_16b_to_b, VAR_16b_to_b);
  // Call once inside loop() - all magic here
  mb.task();
  //yield();

  // Prints the values of the registers and the result of joining 2 16-bit registers
  Serial.print("Register 0 = ");
  Serial.println(VAR_32f_LSB);
  Serial.print("Register 1 = ");
  Serial.println(VAR_32f_MSB);
  Serial.print("Union Reg 0+1 = ");
  Serial.println(VAR_32f_LSB_MSB);
  Serial.println("");
  Serial.print("Register 2 = ");
  Serial.println(VAR_32l_LSB);
  Serial.print("Register 3 = ");
  Serial.println(VAR_32l_MSB);
  Serial.print("Union Reg 2+3 = ");
  Serial.println(VAR_32l_LSB_MSB);
  Serial.println("");

  // Prints the value of register 4 in decimal
  Serial.print("Register 4 = ");
  Serial.println(VAR_16b_to_b);
  // Prints the value of register 4 in binary
  Serial.print("Register 4 BIN= ");
  Serial.println(VAR_16b_to_b, BIN);
  // Prints the value of register 4 bit by bit
  Serial.print("Register 4 bit 0 = ");
  Serial.println(mb_b00);
  Serial.print("Register 4 bit 1 = ");
  Serial.println(mb_b01);
  Serial.print("Register 4 bit 2 = ");
  Serial.println(mb_b02);
  Serial.print("Register 4 bit 3 = ");
  Serial.println(mb_b03);
  Serial.print("Register 4 bit 4 = ");
  Serial.println(mb_b04);
  Serial.print("Register 4 bit 5 = ");
  Serial.println(mb_b05);
  Serial.print("Register 4 bit 6 = ");
  Serial.println(mb_b06);
  Serial.print("Register 4 bit 7 = ");
  Serial.println(mb_b07);
  Serial.print("Register 4 bit 8 = ");
  Serial.println(mb_b08);
  Serial.print("Register 4 bit 9 = ");
  Serial.println(mb_b09);
  Serial.print("Register 4 bit 10 = ");
  Serial.println(mb_b10);
  Serial.print("Register 4 bit 11 = ");
  Serial.println(mb_b11);
  Serial.print("Register 4 bit 12 = ");
  Serial.println(mb_b12);
  Serial.print("Register 4 bit 13 = ");
  Serial.println(mb_b13);
  Serial.print("Register 4 bit 14 = ");
  Serial.println(mb_b14);
  Serial.print("Register 4 bit 15 = ");
  Serial.println(mb_b15);
  Serial.println("");
  Serial.println("");
  //delay(10);
}