initial.asm

来自「TI公司生产的C54系列DSP定时器实验程序」· 汇编 代码 · 共 27 行

	.mmregs
	.global _initial
_initial:
	NOP
	LD #0, DP  		     ; reset data pointer
	STM #0, CLKMD        ; software setting of DSP clock
	STM #0, CLKMD       ; (to divider mode before setting)
TstStatu1:
    LDM CLKMD, A
    AND #01b, A         ;poll STATUS bit
    BC TstStatu1, ANEQ	
	STM #0xF7FF, CLKMD  ; set C5402 DSP clock to 10MHz
	STM  0x3FA0, PMST   ; vectors at 3F80h
	stm 	300h,ar1    ;initial 300h data address
	st  	#00h,*ar1
	ssbx	1,11        ;set ST1.INTM=1,stop all interrrupt
	stm 	0ffffh,ifr  ;clear all interrupt indicate
	stm 	00h,imr     ;set imr=0,stop all interrrupt

	stm 	410h,tcr    ;stop timer 	
	stm 	4e1fh,prd   ;set prd=4e1fh
	stm 	420h,tcr    ;start timer
	
	stm 	08h,imr     ;allow timer interrupt
	rsbx 	1,11        ;set ST1.INTM=0,start all interrrupt
	ret