What is the total number of data frames needed to transfer an entire 1024 bytes block?
Also, what is the minimum amount of time needed to complete this method?
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You need to define the time cycle for your communication. It depends on the length of your frame (it depends on the identifier, 29 bits or 11 bits). Usually the maximum length is 126 bits for a data frame (CAN 2.0), and the bite rate in your case (1 Mbit/s). You also need to introduce the bit stuffing. You must also define the maximum distance of your CAN installation.