/*
  Assembler delay routine example

  FCPU=64MHz

  14_02_2021 chris

*/
    .cpu cortex-m4
    .syntax unified
    .thumb_func
    .global asmDelay

asmDelay:
    push {R1}
    
    nop
nMsCount:
    ldr r1,=9171 @ delay value addapted with oscilloscope .. limited accuracy

oneMsDelay:
    subs r1, #1
    bne oneMsDelay	

    subs r0, #1
    bne nMsCount

    pop {R1}

    bx   lr

@ https://www.mikrocontroller.net/articles/ARM-ASM-Tutorial
@ https://stackoverflow.com/questions/28669905/what-is-the-difference-between-the-arm-thumb-and-thumb-2-instruction-encodings