8051 Program - replace 0x00 with ETX in string

; Description:

; Search Data Memory DPTR Points To Until A 0x00 Is Found, Or R0 Is 0,

; And Replace With An ETX. DPTR Points To Data, R0 Contains Maximum

; Length To Search

;

; Entry Requirements:

; DPTR Points To A 0 Terminated String In External Memory

; R0 Contains Maximum Length To Search

;

; On Exit:

; R0 = 0

;

; Affected:

; PSW.Z, PSW.P, Acc, DPTR, R0

;

; Stack:

; 2 Bytes, Not Including Space Used By Called Routines

;

; Comments:

; None

;

	ETX equ 3	; ASCII ETX Character
UTIL_PUT_ETX:
	push dph	; Save DPH
	push dpl	; Save DPL
		;
loop1:	movx a,@dptr	; Get Character
	jz loop2	; If 0, Replace And Exit
	inc dptr	; Next Location
	djnz r0,loop1	; Repeat For R0 Bytes
		;
loop2:	mov a,#ETX	; ETX Character
	movx @dptr,a	; Store It
		;
	pop dpl	; Recover DPL
	pop dph	; Recover DPH
	ret	; Return To Caller

Source: Assorted Utilities, John C. Wren 11/23/96

---

<< Previous :: Up :: Next >>

---

Related topics:
8051 Program - locate ETX in string   |   8051 Program - remove trailing spaces   |   8051 Program - return length of string   |   8051 Program - memory subroutines   |   8051 Program - math subroutines   |   8051 Program - conversion subroutines

---

List of topics: 8051

---