SEND RECEIVE ARRAY accuracy check

[Camerart]

Hi,
I'm learning ARRAYS, in my case I'm sending using SPI.

I have tried lots of different ideas, and am figuring out that each BYTE, is sent anonymously, so must be labelled correctly by the receiver e,g 1st = 1st and so on. Is this correct?

I have a send(10) BYTE ARRAY, and a receive(10) BYTE ARRAY. This is working fine as '1' goes in '1' and so on, but I can see there may be errors later if I'm not sure what happening.

I'm wondering if a start and stop BYTE could be sent, so that receive knows when to start counting and when to stop. Is this normal, or a good idea?
Cheers, Camerart.

 

[Cromewell]

Usually you will send a content length type message to know how many bytes are expected.

 

[Camerart]

Usually you will send a content length type message to know how many bytes are expected.

Hi C,
Something like a BYTE with 'say' 10 in it, and the receiver sets up a (10) BYTE array?
C.

 

[Cromewell]

Yes, basically. Some kind of fixed size message to indicate the size of whatever is following. Then the variable sized thing that you now know how much to read.

 

[Camerart]

Yes, basically. Some kind of fixed size message to indicate the size of whatever is following. Then the variable sized thing that you now know how much to read.

Hi C,
Ok, thanks, that's good.
C

 

[Camerart]

Hi,
I've been reminded of LEN(), can someone explain how this would work with a list of BYTES, so that they are read in sequence, please?
C

 

[Camerart]

Hi,
With help, I've now done it, using LEN() to find the length of the array, then Midstring to extract each byte.
Thanks, C