;=====================================================================
; File Name	:	Cap_drv.asm			
; Module Name	: 	CAP_EVENT_DRV	
; Initialization Routine: CAP_EVENT_DRV_INIT
; Description:	Provides the instantaneous value of the selected time 
; 				base(GP Timer) captured on the occurrence of an event. 
;					Such events can be any specified transition of a signal 
;					applied at the capture input pins of 24x/24xx devices.
; 
;							|~~~~~~~~~~~~~~~|
;	CAPn (EV H/W pin) o---->|				|----->o  FIFOn
;							|CAP_EVENT_DRV 	|
;							|				|
;							|---------------|
;
;=====================================================================
;(To use this Module, copy this section to main system file)
;		.ref	CAP_EVENT_DRV, CAP_EVENT_DRV_INIT	;function call
;		.ref	CAP_EVENT_DRV_CLKPS_INIT			;function call
;		.ref	CLK_prescaler_bits					;Parameter			
;=====================================================================
;Module definitions for external reference.
		.def	CAP_EVENT_DRV, CAP_EVENT_DRV_INIT	;function call
		.def	CAP_EVENT_DRV_CLKPS_INIT			;function call
		.def	CLK_prescaler_bits					;Parameter	
;=====================================================================
		.include	x24x_app.h
		.bss		CLK_prescaler_bits,1

;Select Capture inputs
CAP1		.set	1
CAP2		.set	0
CAP3		.set	0
CAP4		.set	0

;=====================================================================
CAP_EVENT_DRV_INIT:
;=====================================================================
;---target dependancy---------------

		POINT_PF2

		.if (x240)						;Select CAP functions for the I/O 
；pins on x240
		.if (CAP4)
		LACC	OCRB
		OR		#00010000000b			;Set pin function as CAP4.
		SACL	OCRB	
		.endif
		
		.if (CAP3)
		LACC	OCRB
		OR		#01000000b				;Set pin function as CAP3.
		SACL	OCRB
		.endif

		.if (CAP2)
		LACC	OCRB
		OR		#00100000b				;Set pin function as CAP2.
		SACL	OCRB
		.endif

		.if (CAP1)		
		LACC	OCRB
		OR		#00010000b				;Set pin function as CAP1.
		SACL	OCRB	
		.endif
		.endif
;---------------------------------------------------------------------
		.if (x243)						;Select CAP functions for the I/O 
；pins on x243
		.if (CAP3)
		LACC	OCRA
		OR		#00100000b
		SACL	OCRA					;Set pin function as CAP3.	
		.endif

		.if (CAP2)
		LACC	OCRA
		OR		#00010000b
		SACL	OCRA					;Set pin function as CAP2.	
		.endif

		.if (CAP1)
		LACC	OCRA
		OR		#00001000b
		SACL	OCRA					;Set pin function as CAP1.	
		.endif
		.endif
;---------------------------------------------------------------------
		.if (x2407)						;Select CAP functions for the I/O 
；pins on x2407
		.if (CAP3)
		LACC	MCRA
		OR		#00100000b
		SACL	MCRA					;Set pin function as CAP3.
		.endif

		.if (CAP2)
		LACC	MCRA
		OR		#00010000b
		SACL	MCRA					;Set pin function as CAP2.
		.endif

		.if (CAP1)
		LACC	MCRA
		OR		#0001000b
		SACL	MCRA					;Set pin function as CAP1.
		.endif
		.endif				
;---------------------------------------------------------------------;---target dependancy--------------------------------------------------------
		.if (x240 | x243)				;Use Timer T2 as time base with 
；default clock prescaler
		POINT_B0
		SPLK	#2, CLK_prescaler_bits	;Default prescaler set to x/4
		CLRC	SXM
		LACC	CLK_prescaler_bits,8
		AND		#0700h
;			 	5432109876543210
;			 	||||!!!!||||!!!!
		OR		#1001000001000010b		
		POINT_EV
		SACL	T2CON 					;Cont Up mode
		
		SPLK	#0FFFFh, T2PER		

;Empty all FIFOs
		LACC	FIFO1
		LACC	FIFO1 
		LACC	FIFO2
		LACC	FIFO2
		LACC	FIFO3
		LACC	FIFO3				

; Configure Capture registers. [options: Enable CAP1, CAP2, CAP3, CAP4 func]

		.if (CAP1 | CAP2)
;			 	5432109876543210
;			 	||||!!!!||||!!!!
		SPLK	#1010000001010000b,CAPCON ;CAP1/2 En, TMR2, +ve edge
		.endif

		.if (CAP3)
;			 	5432109876543210
;			 	||||!!!!||||!!!!
		SPLK	#1001000000000100b,CAPCON ;CAP3 En, TMR2, +ve edge
		.endif

		.if (CAP4)
;			 	5432109876543210
;			 	||||!!!!||||!!!!
		SPLK	#1000100000000001b,CAPCON ;CAP4 En, TMR2, +ve edge
		.endif
		.endif
;---------------------------------------------------------------------;---target dependancy--------------------------------------------------------
		.if (x2407)						;Use Timer T2 as time base with 
；default clock prescaler
		POINT_B0
		SPLK	#2, CLK_prescaler_bits	;Default prescaler set to x/4
		CLRC	SXM
		LACC	CLK_prescaler_bits,8
		AND		#0700h
;			 	5432109876543210
;			 	||||!!!!||||!!!!
		OR		#1001000001000010b		
		POINT_EV
		SACL	T2CON 					;Cont Up mode
		
		SPLK	#0FFFFh, T2PER		

; Configure Capture registers. [options: Enable CAP1, CAP2, CAP3]

;Select one of following options
		.if (CAP1 | CAP2)
;			 	5432109876543210
;			 	||||!!!!||||!!!!
		SPLK	#1010000001010000b,CAPCONA ;CAP1/2 En, TMR2, +ve edge
		.endif

		.if (CAP3)
;			 	5432109876543210
;			 	||||!!!!||||!!!!
		SPLK	#1001000000000100b,CAPCONA ;CAP3 En, TMR2, +ve edge
		.endif
		.endif
		
		RET
;=====================================================================
CAP_EVENT_DRV_CLKPS_INIT:
;=====================================================================
;---target dependancy--------------------------------------------------------
		.if (x240 | x243)					;Use Timer T2 as time base with 
；selectable clock prescaler 
		POINT_B0
		CLRC	SXM
		LACC	CLK_prescaler_bits,8		;Input user selected prescaler
		AND		#0700h
;			 	5432109876543210
;			 	||||!!!!||||!!!!
		OR		#1001000001000010b		
		POINT_EV
		SACL	T2CON 						;Cont Up mode
		.endif

;---target dependancy--------------------------------------------------------
		.if (x2407)							;Use Timer T2 as time base with 
；selectable clock prescaler
		POINT_B0
		CLRC	SXM
		LACC	CLK_prescaler_bits,8		;Input user selected prescaler
		AND		#0700h
;			 	5432109876543210
;			 	||||!!!!||||!!!!
		OR		#1001000001000010b		
		POINT_EV
		SACL	T2CON 						;Cont Up mode
		.endif

		RET
;=====================================================================
CAP_EVENT_DRV
;=====================================================================
;No S/W functions are performed here. Capture module performs internal 
;H/W functions as specified in the initialization routines.

		RET