I want to receive string in HEX formate using UART like 0x3f, 0x00, 0x11,0x2A,0xF2, etc...
What should i have to do?
Please help me with example tutorial as soon as possible.
Hex format is only a representation of the same data. So you can receive the string as usual and after that print it as HEX.
To be specific, tell why you need a data in hex format?
"Hex format" is a human readable representation of binary data, as is "decimal format".
For help with your project, post the details about the source of the data (e.g. a link to the device producing it, or to the device manual that explains the actual data format).
There's a tutorial called Serial input basics. Search for it, it tells you all you need to know.
UART can receive only binary. High and low. Binary digits or "bits". Those can be, and normally are, grouped into bytes (8 bits). A byte can represent a number in the range 0..255 (decimal) or 0..FF (hexadecimal) or a single ASCII character.
So, in the data you want to receive, is 0x3F a single byte or 2 ASCII characters '3' and 'F' or 4 ASCII characters '0', 'x', '3' and 'F' ?
My Master Sends data like 0x3f, 0x00, etc as shown in my post...
Master is computer's RS-232 Port.
and as receiver is UNO.. in UNO Receive buffer has ascii of "3","F" instead of hex of combined 3F..so what should i have to do?
while other microcontroller's receive buffer receive 0x3F when computer send 0x3F.
so how can i receive direct hex value which is send by computer?
Incorrect. Uno is not different from any other microcontroller. If the Uno receives '3' followed by 'F' then the master must be sending them as 2 ASCII characters. Any other microcontroller would receive the same way.
If your master send the "3F" as two chars "3" and "F" - so you have no options to receive it as hex 3F value. But if the other mcu can receive it as single byte - it seems to me that you have a mistake in your understanding.
Please show your Uno code.
Hello
Provide a datalogging dump too.
It seems to be a ASCII-HEX protocol, very stange.
Hey,
Is there any option to receive this data as 3f????
Yes. Start by sending it as one character, 0x3F.
Probably not. I think you are still confused by the difference between binary data and human readable representations of binary data.
To send one byte of binary data over UART serial using Arduino, this is one possibility:
Serial.write(0x3F);
To send ASCII HEX representation over UART serial takes two bytes
char buf[]="3F"; //ASCII HEX representation of the binary byte 0x3F
Serial.write(buf,2);
Dear,
i am very clearly aware between binary data and Human Readable Representation of binary data.
I want to receive data from computer to Arduino in Hex like 0x3f, 0xff, 0x7A, etc...
But in arduino it receives ascii of '3','F', 'F','F','7','A' instead of 0x3f, 0xff, 0x7A, so what should i have to do?
Hello jignesh0310
Check, try and fine tune this ASCII to HEX converter to your needs.
void decode(char rx_char)
{
switch(rx_char)
{
case '0' ... '9':
Serial.println(rx_char-'0',HEX);
break;
case 'A' ... 'F':
Serial.println(rx_char-'A'+10,HEX);
break;
}
}
Have a nice day and enjoy coding in C++.
This is just conversion of ascii to hex, nothing else...
I want to receive 0x3f in arduino from computer, is there any option receive this data?
shall do I make your work?
x
please show us the code how you receive and how you print the received characters.
Post both: the code and the output in the serial monitor.
please post both information as soon as possible.
1 Like
If you want to receive that, then you must also SEND it!
I repeat, since you repeat.
Yes. Send it as one character, 0x3F, and it will be received as such.
Hey Guys,
I can receive data as i required, and i have post my code below.
Now my question is there is some delay while receive two characters, when i haven't insert any delay in my loop.
so from where this delay is occur in my code?
sketch_feb18a.ino (1.5 KB)