Arduino Serial Byte Array
Description
An array is a collection of variables that are accessed with an index number. Arrays in the C programming language Arduino sketches are written in can be complicated, but using simple arrays is relatively straightforward. Sep 23, 2016 edit: I think I got off on a tangent here sorry. If you are using a char array and a byte array then you can just run a loop that will change one to the other. But if your byte is greater than 9 then there is no char value for it in the arduino ascii table. You would have to start adding array positions in the middle by shifting everything else. Serial.readBytesUntil reads characters from the serial buffer into an array. The function terminates (checks being done in this order) if the determined length has been read, if it times out (see Serial.setTimeout), or if the terminator character is detected (in which case the function returns the characters up to the last character before the supplied terminator).
Serial.readBytes() reads characters from the serial port into a buffer. The function terminates if the determined length has been read, or it times out (see Serial.setTimeout()).
Serial.readBytes() returns the number of characters placed in the buffer. A 0 means no valid data was found.
Serial.readBytes() inherits from the Stream utility class.
Syntax
Parameters
Serial: serial port object. See the list of available serial ports for each board on the Serial main page.buffer: the buffer to store the bytes in. Allowed data types: or array of char or byte.length: the number of bytes to read. Allowed data types: int.
Returns
The number of bytes placed in the buffer. Data type: size_t.
Arduino Serial Byte Array Send
I communicate with Arduino via Serial using a program that sends a series of bytes.
In order for the Arduino to realize it is receiving a message rather than junk, I have tagged the start of my byte array with the chars 'S' 'T' 'A' 'R' 'T'. After this will eventually follow a series of bytes that will be assigned to internal variables (not yet implemented).
The Arduino must read each byte sequentially and compare it to the byte array and if all are present in the correct order it will continue with the next part of the program, otherwise it will should discard current byte and wait for more bytes to arrive.
I am trying to implement it in the most efficient and readable way rather than using a series of nested if statements.
So far I have got:
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This however doesn't seem to get past the second byte and I'm not sure why.
dsolimano3 Answers
Worked it out :
Here is the answer:
This may not be the most efficient way perhaps, but I can't see a problem with it currently.
ZacZacBetter answer : This allows the rest of the loop to iterate while waiting for the message to finish and if the full handshake message isn't received the counter will reset.
ZacZacYou could try to calculate your message. CRC is old and good solution. I use it and it works perfect for me. I am not sure what kind of device are you communicating with.
when you need to calculate CRC
uint32_t crc = crc32_bitwise(data_bytes, sizeof(data_bytes));
data_bytes is byte array.
Then you can get all settings or message in byte data[x] and calculate CRC. Then you can add CRC to the message and send message byte data[x+sizeof(CRC)]
P.S. Use byte instead of int. For ex. for(byte x =0; x<sizeof(handShake); x++)
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