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Q10023. Routine (Word2Hex) of preparing a 16 bit number to be printed in HEX form.

More information

Converts a 2-byte value to four hexadecimal characters. All values are considered positive. Uses Byte2Hex routine twice...

Assembler

Any assembler.

Input

(SP+4) -> Number to convert
(SP+2) -> Four-byte ASCII buffer start address
(SP+0) -> Normal return address

Output

ASCII buffer is filled with the converted number
A : Ascii code of lowest nibble of converted number
DE: Number to convert
HL: Pointer to last char in buffer

Routine

Word2Hex:	POP	DE		;Get ret address temporarily
		POP	HL		;Get Buffer address
		LD	(W2HBuf),HL	;Save Buffer address
		POP	HL		;Get Number
		LD	(W2HNum),HL	;Save Number
		PUSH	DE		;Push return address
		LD	L,H		;MSB to LSB
		PUSH	HL		;Push MSB
		LD	HL,(W2HBuf)	;Retrieve buffer pointer
		PUSH	HL		;Push buffer address
		CALL	Byte2Hex	;Fill half buffer
		INC	HL		;HL points to third char in buffer
		LD	DE,(W2HNum)	;DE now holds LSB of Number
		PUSH	DE		;Number to Stack
		PUSH	HL		;Buffer to Stack
		CALL	Byte2Hex	;Fill rest of buffer
		RET			;Done.

W2HBuf:		DW	0000h
W2HNum:		DW	0000h

Added by

Marcelo Lopez

14 May 2003.
PETERS PLUS LTD.

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