ctrlio.s

来自「周立功 214x pack 配套光盘」· S 代码 · 共 28 行

	AREA	AsmFunc, CODE, READONLY
	EXPORT	Pulses

Pulses
	STMFD	SP!, {R4-R6, LR}		;入栈
	
	;LDR		R4, =0xE01FC1A0
	;MOV		R6, #0x03
	;STR		R6, [R4]
		
	LDR		R4, =0x3FFFC01C			;FIO0CLR0
	LDR		R5, =0x3FFFC018			;FIO0SET0
	MOV		R6, #0x80				;P0.7

	STR		R6, [R4]
	STR		R6, [R5]
	
	STR		R6, [R4]
	STR		R6, [R5]
	
	STR		R6, [R4]
	STR		R6, [R5]

	LDMFD	SP!, {R4-R6, LR}		;返回

	END