gpio.asm

来自「实现240XDSP中的PWM波,SCI,SPI,usb,DA等一系列的模块化源程」· 汇编 代码 · 共 103 行

;************	GPIO.asm	***************

	
	.global     start 
	.global		PHANTOM
	
	.data
	
b0	.word	0fffEh		;turn-on GPIO0
b1	.word	0fffDh		;turn-on GPIO1
b2	.word	0fffBh		;turn-on GPIO2
b3	.word	0fff7h		;turn-on GPIO3
b4	.word	0ffEFh		;turn-on GPIO0
b5	.word	0ffDFh		;turn-on GPIO1
b6	.word	0ffBFh		;turn-on GPIO2
b7	.word	0ff7Fh		;turn-on GPIO3
GPR0	.word	0

	.include f2407.h
KICK_DOG	.macro
	LDP	#00E0h		;DP-->7000h-707fh
	SPLK	#05555h,WDKEY
	SPLK	#0aaaah,WDKEY
	LDP	#0h		;DP-->0000h-007fh
	.endm
	
	.text
start:
	LDP	#0h		
	SETC	INTM
	SETC	CNF
	SPLK	#0000h,IMR
	LACC	IFR
	SACL	IFR
	LDP	#00E0h
	SPLK	#0200h,SCSR1
	SPLK	#006Fh,WDCR
	KICK_DOG
	SPLK	#0h,GPR0
	OUT	GPR0,WSGR
	
	LDP	#00E1h
	SPLK	#00000h,MCRA
	SPLK	#0FF00h,MCRB
	SPLK	#00000h,MCRC
	
	SPLK	#0FFFFh,PADATDIR
	SPLK	#0FFFFh,PBDATDIR
	SPLK	#0FFFFh,PCDATDIR
	SPLK	#0FFFFh,PEDATDIR
	SPLK	#0FFFFh,PFDATDIR
	
MAIN:
	LDP	#0

	
LOOP:

	LDP	#00E1h
	
	setc	xf
	CALL	DELAY
	SPLK	#0FFFFh,PADATDIR
	CALL	DELAY
	SPLK	#0FFFFh,PBDATDIR
	CALL	DELAY
	SPLK	#0FFFFh,PCDATDIR
	CALL	DELAY
	SPLK	#0FFFFh,PEDATDIR 
	CALL	DELAY
	SPLK	#0FFFFh,PFDATDIR
	CALL	DELAY
	
	CALL	DELAY 
	
	clrc	xf
	CALL	DELAY 
	SPLK	#0FF00h,PADATDIR 
	CALL	DELAY
	SPLK	#0FF00h,PBDATDIR
	CALL	DELAY
	SPLK	#0FF00h,PCDATDIR
	CALL	DELAY
	SPLK	#0FF00h,PEDATDIR  
	CALL	DELAY
	SPLK	#0FF00h,PFDATDIR  
	CALL	DELAY
	
    CALL	DELAY
    
	B	MAIN
	
DELAY:

D_LOOP:
	RPT	#0FFh
	NOP    
	RET     
	
PHANTOM:
	KICK_DOG
	B	PHANTOM