ARDUINO: Receive a serial data string, break down into HEX pairs, calculate checksum
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Hi,
I require an Arduino sketch to receive a string on Serial(1), calculate the checksum and validate the checksum against the data. I also need a function to calculate the checksum of data I would like to send.
This is an example of a received data string:
056F3800792Fzz<cr>
- Where <cr> is a carriage return character
- Where zz is the checksum of the preceeding bytes
The checksum is calculated as the 2 ’s complement of the modulo 256 sum of the preceding bytes.
In other words:
a) Sum all of the bytes (the hex character pairs);
b) Find the remainder when the sum is divided by 256;
c) Take the 2’s complement (invert the bits and then add 1) of the remainder.
This checksum has the property that when the bytes including the checksum are
summed modulo 256, the result will always be zero if the check passes, and non-zero
indicates the presence of an error in the data stream. The checksums are performed on the hexadecimal data (the ASCII character
pairs).
For example, suppose the following command is to be sent:
\0538007988
Summing the bytes: $05 + $38 + $79 + $88 = $13E. Modulo 256 ($100), this is $3E.
The checksum (2’s complement and add 1) = $C2.
Checking: $05 + $38 + $79 + $88 + $C2 = $200, which is $00 modulo 256 ($100).
This command would be sent as:
\0538007988C2g<cr>
So in summary, there are two parts to this project:
RECEIVING DATA:
- Receive the string
- Calculate the checksum of the preceeding bytes
- Compare it to the received checksum (which is at the end of the data string)
- Discard the message if the checksum does not match
- If the checksum matches (data is okay), print the data to Serial(0) in its individual hex pairs, comma deliminated (EG: [login to view URL](05,38,00,79,88,C2)
- I need to be able to query each hex pair of the received data. This could be done by storing the received data in an array, which is wiped each time a new piece of data is received.
TRANSMITTING DATA:
- I also need to send similar formatted data strings.
- To aid in this I need to calculate the checksum of my bytes and append it to the data string before it is sent.
- This could be implemented as a function?
- The checksum is appended to the end of the data I am trying to send
- An additional ASCII character needs to be appended AFTER the checksum. EG (seen here as a 'g'): 0538007988C2g<cr>
SERIAL PORT MAPPINGS:
Send/Receive is on Serial(1)
Console output for diagnostics is on Serial(0)
ID Proyek: #21432808
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Hi, I have worked on a similar project, on a microcontroller, to upload a hex file using bootloader. the code sends and receive hex strings, with checksum verification upon receiving and sending. This project was done Lebih banyak
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It looks simple enough. Read data do a checksum, compare checksum and if its wrong do nothing. If its correct put them in an array and print out in SERIAL(0 ) All data received from Serial(1) ...OK, Checksum with 2's c Lebih banyak
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