Converting string back to byte array C-CodePudding

So I have a string that contains a byte array of HEX values.

I am trying to figure out how to go from the string back to the original byte array.

I am using an Arduino-based board.

Simply put, I want to turn this:

char addr3[47] = "0x28, 0xB6, 0x4C, 0x4E, 0x0D, 0x00, 0x00, 0x86";

Back into this:

byte addr2[8] = {0x28, 0xB6, 0x4C, 0x4E, 0x0D, 0x00, 0x00, 0x86};

Thank you for your help.

EDIT, Here is a solution I came up with following the answers/comments:

Starting with: char addr3[47] = "0x28, 0xB6, 0x4C, 0x4E, 0x0D, 0x00, 0x00, 0x86";

I run the string through this:


  sscanf(addr3, "%x", &r1); 
  sscanf(addr3, "%*s %x", &r2); 
  sscanf(addr3, "%*s %*s %x", &r3); 
  sscanf(addr3, "%*s %*s %*s %x", &r4); 
  sscanf(addr3, "%*s %*s %*s %*s %x", &r5); 
  sscanf(addr3, "%*s %*s %*s %*s %*s %x", &r6); 
  sscanf(addr3, "%*s %*s %*s %*s %*s %*s %x", &r7); 
  sscanf(addr3, "%*s %*s %*s %*s %*s %*s %*s %x", &r8); 
  byte addr[8] = {r1,r2,r3,r4,r5,r6,r7,r8};

and then we get:

byte addr[8] = 28B64C4ED0086

Which although is not the exact format I was looking for, it will work.

CodePudding user response：

To accomplish this you need to parse the string and convert the individual values to byte. You can do this using the sscanf function in the c library. I don't know if the arduino has an implementation of the sscanf function. But I would look into that first. If it does not then you will have to write a function that reads each character of the hex string and coverts it to the 4bit equivalent.