Decimal to Hex conversion, "0x00" format

aprentik · June 2, 2023, 6:56am

I don't know how to fill a byte string with the format "0x00".
I need to create LedAddress[0]=0x02 from an int variable Address
LedAddress[0]= (Address, HEX); Out of order

How can I create this variable correctly?
Thanks

#include <RS485.h>


void setup() 
  {
  RS485.begin(9600, HALFDUPLEX);    // Si fos RS422 auries de fer el setup() daquesta manera RS485.begin(9600, FULLDUPLEX)
  Serial.begin(9600); 
  delay(1000);
  Serial.println("********************************");
  Serial.println("Ver 0_0 Convertir Decimal a Hex ");
  Serial.println("********************************"); 
  }

void loop() 
  {
  EncenLed(1,2,1);  //adrec 2, Color Verd, Encen
  delay(2000);   
  Serial.println();
  
  }

void EncenLed(int Adreca, int ColorLed, int OnOff)
   {
   byte LedAddress[8] = {0x02, 0x05, 0x00, 0x02, 0xFF, 0x00, 0x2D, 0xC9};  //02 05 00 02 FF 00 2D C9 -> Encen Verd
        //LedAddress = {0x02, 0x05, 0x00, 0x02, 0x00, 0x00, 0x6C, 0x39};   //02 05 00 02 00 00 6C 39 -> Apaga verd 


   //Encen Verd
   Serial.println("Encent");
   LedAddress[0]= (Adreca, HEX);  //NO FUNCIONA
   //LedAddress[0]=0x02; 
   LedAddress[1]=0x05; LedAddress[2] =0x00; LedAddress[3] =0x02; 
   LedAddress[4] =0xFF; LedAddress[5] =0x00; LedAddress[6] =0x2D; LedAddress[7] = 0xC9; 
   for (size_t i=0; i < sizeof LedAddress; i++) 
     {
     RS485.write(LedAddress[i]);
     }    
   delay(5000);
   
   //Apagaga Verd 
   Serial.println("Apaga");
   LedAddress[0]=0x02; LedAddress[1]=0x05; LedAddress[2] =0x00; LedAddress[3] =0x02; 
   LedAddress[4] =0x00; LedAddress[5] =0x00; LedAddress[6] =0x6C; LedAddress[7] = 0x39; 
   for (size_t i=0; i < sizeof LedAddress; i++) 
     {
     RS485.write(LedAddress[i]);
     }
   
   }

PaulRB · June 2, 2023, 6:59am

LedAddress[0]= Address;

sherzaad · June 2, 2023, 7:00am

if you where PRINTING the value out the format (ie, Hex, dec, bin, etc) would matter.

put it seems you are acually sending the value out, so there human readable formats are irrelevant!

just use the int value for your LED address....

hope that helps...

b707 · June 2, 2023, 7:01am

Hex decimal and binary - are the representations only for humans.
It is absolutely doesn't matter for controller, all the lines below are equivalent:

LedAddress[0]=0x02;
LedAddress[0]= 2;
LedAddress[0]= 0b00000010;

So you don't need any 'conversion" to store hex byte to the value.

aprentik · June 2, 2023, 7:06am

LedAddress[0]=0x02 --> is what I need to have.
I have an "int variable Address = 2"
How can I create LedAddress[0] from an "int" , which has the HEX format "0x00"?

b707 · June 2, 2023, 7:08am

 LedAddress[0]  = Address;

wrong.
You still not understand that LedAddress[0] hasn't such format "0x00"

aprentik · June 2, 2023, 7:12am

thanks, it doesn't work because it is not "0x00" format.

PaulRB · June 2, 2023, 7:12am

Did you try it? If so, post the error message you see.

Or did you assume it would not work?

b707 · June 2, 2023, 7:14am

there is no such format for integer data. Forget it.
If your code not works - look for errors in the code, not in fictitious formats.

Show your whole code.

aprentik · June 2, 2023, 7:16am

Yes I have tried it.


int Address = 2;
  
LedAddress[0]= (Address, HEX); //OUT OF ORDER
LedAddress[0]= Address; //OUT OF ORDER
LedAddress[0]=0x02; //IF IT WORKS

b707 · June 2, 2023, 7:18am

What the type and value of the Address variable?

aprentik · June 2, 2023, 7:20am

Thanks for the help. I put all the code at the beginning. The "EncenLed" function.
As you can see, if I write the variable directly, it works for me. The problem I have is because the variable with parameters is not created.

void EncenLed(int Adreca, int ColorLed, int OnOff)
   {
   byte LedAddress[8] = {0x02, 0x05, 0x00, 0x02, 0xFF, 0x00, 0x2D, 0xC9};  //02 05 00 02 FF 00 2D C9 -> Encen Verd
        //LedAddress = {0x02, 0x05, 0x00, 0x02, 0x00, 0x00, 0x6C, 0x39};   //02 05 00 02 00 00 6C 39 -> Apaga verd 


   //Encen Verd
   Serial.println("Encent");
   LedAddress[0]= (Adreca, HEX);  //NO FUNCIONA
   //LedAddress[0]=0x02;   //SI FUNCIONA
   LedAddress[1]=0x05; LedAddress[2] =0x00; LedAddress[3] =0x02; 
   LedAddress[4] =0xFF; LedAddress[5] =0x00; LedAddress[6] =0x2D; LedAddress[7] = 0xC9; 
   for (size_t i=0; i < sizeof LedAddress; i++) 
     {
     RS485.write(LedAddress[i]);
     }    
   delay(5000);
   
   //Apagaga Verd 
   Serial.println("Apaga");
   LedAddress[0]=0x02; LedAddress[1]=0x05; LedAddress[2] =0x00; LedAddress[3] =0x02; 
   LedAddress[4] =0x00; LedAddress[5] =0x00; LedAddress[6] =0x6C; LedAddress[7] = 0x39; 
   for (size_t i=0; i < sizeof LedAddress; i++) 
     {
     RS485.write(LedAddress[i]);
     }
   
   }

b707 · June 2, 2023, 7:20am

Your LedAddress[8] array contains 8 bytes. Why do you assign only first one?

b707 · June 2, 2023, 7:21am

are you meant this code:

?

b707 · June 2, 2023, 7:23am

Your code is not complete. There is no setup() and loop() functions, so impossible to see how you using your "EncenLed" function

aprentik · June 2, 2023, 7:23am

It is an integer, which can range from 0 to 255. But for the peripheral, these are HEX addresses from 0 to FF

aprentik · June 2, 2023, 7:24am

#include <RS485.h>


void setup() 
  {
  RS485.begin(9600, HALFDUPLEX);    // Si fos RS422 auries de fer el setup() daquesta manera RS485.begin(9600, FULLDUPLEX)
  Serial.begin(9600); 
  delay(1000);
  Serial.println("********************************");
  Serial.println("Ver 0_0 Convertir Decimal a Hex ");
  Serial.println("********************************"); 
  }

void loop() 
  {
  int a, b, c = 0;

  /*
  a = random(1,4);
  b = random (0,2);
  c = random (0,3);  // 0 vermell, 2 verd
  EncenLed(a,c,b);
  */
  EncenLed(2,2,1);  //adrec 2, Colr Verd, Encen
  delay(2000);   
  Serial.println();
  
  }

void EncenLed(int Adreca, int ColorLed, int OnOff)
   {
   byte LedAddress[8] = {0x02, 0x05, 0x00, 0x02, 0xFF, 0x00, 0x2D, 0xC9};  //02 05 00 02 FF 00 2D C9 -> Encen Verd
        //LedAddress = {0x02, 0x05, 0x00, 0x02, 0x00, 0x00, 0x6C, 0x39};   //02 05 00 02 00 00 6C 39 -> Apaga verd 


   //Encen Verd
   Serial.println("Encent");
   LedAddress[0]= (Adreca, HEX);  //NO FUNCIONA
   //LedAddress[0]= Adreca;  //NO FUNCIONA
   //LedAddress[0]=0x02;   //SI FUNCIONA
   LedAddress[1]=0x05; LedAddress[2] =0x00; LedAddress[3] =0x02; 
   LedAddress[4] =0xFF; LedAddress[5] =0x00; LedAddress[6] =0x2D; LedAddress[7] = 0xC9; 
   for (size_t i=0; i < sizeof LedAddress; i++) 
     {
     RS485.write(LedAddress[i]);
     }    
   delay(5000);
   
   //Apagaga Verd 
   Serial.println("Apaga");
   LedAddress[0]=0x02; LedAddress[1]=0x05; LedAddress[2] =0x00; LedAddress[3] =0x02; 
   LedAddress[4] =0x00; LedAddress[5] =0x00; LedAddress[6] =0x6C; LedAddress[7] = 0x39; 
   for (size_t i=0; i < sizeof LedAddress; i++) 
     {
     RS485.write(LedAddress[i]);
     }
   
   }

aprentik · June 2, 2023, 7:26am

It does not give an error, simply, it is not the desired address and the peripheral does not turn on.

b707 · June 2, 2023, 7:27am

0-255 and 0- FF are two absolutely the same integer ranges.

According to your description - it is a single byte. But your address array needs eight bytes. How do you think to construct the address from single byte?

b707 · June 2, 2023, 7:31am

Of course.
After assigning the first byte to "0x02" to the empty address you will get: all zeros in all address fields other than first:

LedAddress[8] = {0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

To construct correct address, you have to assign ALL eight bytes of array.
It is because your code like this works:

Your problem is not in hex format, but in fact that you work with address incorrectly.

Topic		Replies	Views
Converting values to HEX Programming	9	8089	May 5, 2021
Converting int to HEX Programming	3	1203	May 5, 2021
HEX Conversion Programming	13	4557	May 5, 2021
Getting byte values to appear as decimal. Programming	2	3829	May 5, 2021
Converting The value receive from hex string to Decimal Programming	3	14841	May 5, 2021

Decimal to Hex conversion, "0x00" format

Related topics