en_drive.asm.txt

此源码事有关DSP编程用的

********************************************************************
** File Name				: en_drive.asm							**
** Mudule names			: en_drive, dis_drive					**
** Initialization routine	: drive_init							**
** Description			: This program configures the I/O pins  **
**						 and	 enables and disables the drive		**
;=====================================================================;*****************************************************
; Define Peripherals
;*****************************************************
		.include	"x24x_app.h"

;*****************************************************
; Global References and Definitions
;*****************************************************
		.def	en_drive		;
		.def	dis_drive		;
		.def	drive_init		;

		.text
;******************************************************
; Start of main body of code
;******************************************************
drive_init
		.if x240
		; IOPB3: strobe_			; IOPB6: enable_
		;x240 code
		.endif
		.if x243|x2407
		; IOPB4: strobe_			; IOPB6: enable_
		ldp		#OCRA>>7			;
		lacc	OCRA				;
		and		#0afffH				; config IOPB4&6 as IO
		sacl	OCRA				;
		lacc	PBDATDIR			;
		or		#05050h 				; config IOPB4 & IOPB6 as Outputs
		sacl	PBDATDIR			; and output "1" to disable drive
		.endif
		ret

en_drive
		.if x240
		;x240 code
		.endif
		.if x243|x2407
		ldp		#PBDATDIR>>7
		lacc	PBDATDIR			; Get Port B
		and		#0ffefh 				; IOPB4 low
		sacl	PBDATDIR			;
		or		#00010h 				; IOPB4 high
		sacl	PBDATDIR			;
		and		#0ffbfh 				; IOPB6 low
		sacl	PBDATDIR			;
		.endif
		ret

dis_drive
		.if x240
		;x240 code
		.endif
		.if x243|x2407
		ldp		#PBDATDIR>>7			;
		lacc	PBDATDIR				; Get Port B
		or		#05050h 					; IOPB4 & IOPB6 Output "1"
		sacl	PBDATDIR				;
		.endif
		ret