time.asm

DSP5509定时器的汇编程序 包含了定时器的中断

                .title   "timer.asm"
                .include "regs.asm"
                .include "vector.asm"
		       ; .include "sintab.asm"
		       ; .include "atan.asm"
		       ; .include "sig.asm"
		  		.mmregs
				.def main      ;Must have
				.data
stack_len		.set	100
sysstack_len	.set	100
stack			.usect	"stack",stack_len
sysstack		.usect	"stack",sysstack_len

****************************************

	    		.text
main:

****************************************************************
*															   *
* INITIALIZING						   *
*															   *
****************************************************************
        bset  intm                  ;forbid the Maskable Interrupts for initialize
	                                ;关闭所有可屏蔽中断
        bset   c54cm    ;54 compatible mode
         .c54cm_on
        bclr  FRCT
        ;bset  FRCT
        ;bclr  SMUL
        ;bset  SATD
         bset  M40
        ;bset  RDM
         bset  SXMD              ;extent the sign
        ;bset  XF
        ; bset   m40
** INITIALIZE STACK POINTER SP AND SSP **
		amov #(stack+stack_len),xsp  ;data stack point
		mov #(sysstack+sysstack_len),ssp ;pragram stack point
	
** CLOCK **
		mov #2312h,port(#CLKMD)		;144MHz
		
	  
		mov   #0a5h,mmap(IVPH)      ;This is the bits23-8 of Vector Address
		mov   #0a5h,mmap(IVPD)      ;
		mov   #010h,mmap(IER0)	
		;mov   #0h,mmap(IFR0)


**    timer initialized    **
	 	mov   0x0430,port(#TCR0)    ;timer output and Stop the timer
		nop
		mov   000fh,port(#PRSC0)  ;TDDR -PSC
		nop	
		mov   0008h,port(#PRD0)	  ;PRD -TIM
		nop
	    mov   0x0020,port(#TCR0)    ;Start the timer and over loading parameter
	    
		bclr  intm        ;打开所有可屏蔽中断
	

       	
**  wait  **
wait: 	
		nop
        nop
        nop
        nop
        nop
        b     wait 
        
tint0_isr:

		nop
		nop
 reti
 
no_isr:   b   no_isr
       .end