; ***************************************************************************
; Utils_FillSram
;
; IN:
; - x: pointer to SRAM to fill
; - r16: value to fill the SRAM with
; - r17: size of area to fill
; OUT:
; - nothing
; MODIFIED REGISTERS: r17, x

Utils_FillSram:
  tst r17
  breq Utils_FillSram_end

Utils_FillSram_loop:
    st x+, r16
    dec r17
  brne Utils_FillSram_loop
Utils_FillSram_end:
  ret



; ***************************************************************************
; Increment a 32 bit counter at the address given by X.
; IN:
; - X: Address of the 4 byte counter (1. byte is LSB)
; OUT:
; - nothing
; MODIFIED REGISTERS: r18, r19, r20, r21, 22

Utils_IncrementCounter32:
  ld r18, x+
  ld r19, x+
  ld r20, x+
  ld r21, x
  clr r22
  inc r18
  adc r19, r22
  adc r20, r22
  adc r21, r22
  st x, r21
  st -x, r20
  st -x, r19
  st -x, r18
  ret