• Choosing right microcontroller

    pawel0wozny • 12/14/2017 at 20:53 • 0 comments

    First thing that I have to decide is to find uC, that suits my needs. My requirements:

    • Cheap
    • Have some sort of hardware communication (bitbanging would consume scarce CPU time)
    • Have sufficient internal memory. To be more specific:
      • Initial hash value: 8 x 32b - CONST
      • constants: 64 x 32b - CONST
      • 10 temporary registers : 10 x 32b - VAR
      • 8 result storing registers: 8 x 32b - VAR
      • also input memory, at least 8 x 32b - VAR
      • tens/hundred of bytes for iteration, initialization of UART, etc

      Once added, numbers are as follows:

      • VARIABLE: 104 Bytes + program
      • CONSTANTS: 288 Bytes + program
    • platform, that I know: AVR8, STM32

    Long story short, I have to choose between easier (STM32) but boring environment and more challenging (AVR8), but harder. You probably know by now what I choose.

    For now I stick to ATXmega128a3u which I have (I've made long time ago). Once Everything will be nice and neat I will port it to the smallest ATTiny possible.