Algorithm of 32-bit Data Transmission Among Microcontrollers Through an 8-bit Port

Abstract

This paper proposes an algorithm for 32-bit data transmission among microcontrollers through one 8-bit port. This method was motivated by a need to overcome limitations of microcontroller I/O as well as to fulfill the requirement of data transmission which is more than 10 bits. In this paper, the use of an 8-bit port has been optimized for 32-bit data transmission using unsigned long integer, long integer, and float types. Thirty-two bit data is extracted into binary number, then sent through a series of 8-bit ports by transmitter microcontroller. At receiver microcontroller, the binary data received through 8-bit port is reconverted into 32 bits with the same data type. The algorithm has been implemented and tested using C language in ATMega32A microcontroller. Experiments have been done using two microcontrollers as well as four microcontrollers in the parallel, tree, and series connections. Based on the experiments, it is known that the data transmitted can be accurately received without data loss. Maximum transmission times among two microcontrollers for unsigned long integer, long integer, and float are 630 µs, 1,880 µs, and 7,830 µs, respectively. Maximum transmission times using four microcontrollers in parallel connection are the same as those using two microcontrollers, while in series connection are 1,930 µs for unsigned long integer, 5,640 µs for long integer, and 23,540 µs for float. The maximum transmission times of tree connection is close to those of the parallel connection. These results prove that the algorithm works well.

Data Transmission Method on a Room Condition Telemonitoring Application (IoT)

“…Mirdanies et al [8] also discussed the method of data communication between microcontrollers or microprocessors that can transfer 32-bit integer or float data using only 8 digital pins without using other additional communication media, so it is simple and can be used on minimum system microcontroller. Some existing papers, including that have been previously mentioned, usually only discuss one or a few aspects, and do not discuss all aspects of the data transmission.…”