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LED 7 SEGMENT+MSP430G2553

Thuan Dao Vinh
Prodigy 230 points
Other Parts Discussed in Thread: MSP430G2553

How to write a program to show a value in register(R4=10bit) in MSP430G2553 by ASM language, because in the instruction of msp430 no command MUL and DIV,

Help me please!

Thanks!

Thuan

 

 

  • 0
    Guru 35595 points

    Thuan Dao Vinh said:
    no command MUL and DIV,

    So go right back to basics and think how you first learned to do multiplication and division at school:

    Multiplication is just repeated addition - isn't it...?

  • 0 in reply to Andy Neil
    Guru 227245 points

    Andy Neil said:
    Multiplication is just repeated addition

    More efficient is a shift-and-add operation, as it only has as many shifsts and a no more but probably less additions that the smaller operands width. (on MSPs with hardware multiplier, just use this one)

    The difficult part is the division. However, replacing a division by a multiplication and a shift is much, MUCH faster, with acceptable precision.

    If really a division is needed: the MSPGCC project has the default multiplication and division function in the default GCCLIB, which is available as source code. The functions are written in MSP assembly language

  • 0
    Prodigy 220 points
    you can multiply a number by repeatedly adding it while divison can be implemented by repeated subtraction.for displaying the value on 7 segment check this
    xanthium.in/interfacing-7-segment-led-with-msp430-launchpad

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