myisr_b1.s

实现基于ip2022的MPEG2 TS的IP组播接收

	.sect	.isr.tmr.inline,"ax",@progbits
	.global	_isr_tmr
	.func	isr_tmr,_isr_tmr

_isr_tmr:
	
		mov 	w,_np_off
		sub	w,#188
		snz
		jmp	_wnp_end
		
		push 	ADDRSEL
		push	ADDRX
		push	ADDRH
		push	ADDRL
		push	DATAH
		push	DATAL
		
		mov	w, #7   ;APP_ADDRSEL_DST
		mov	ADDRSEL, w
		clr	ADDRX
		mov 	w,_np
		mov     ADDRH,w
		mov 	w,_np_off
		;add	w,#56
		mov     ADDRL,w
		iread
		mov 	w,_np_off
		sb	ADDRL, 0
		mov	DATAH,w
		snb	ADDRL, 0
		mov	DATAL,w
		iwrite
		pop	DATAL
		pop	DATAH
		pop	ADDRL
		pop	ADDRH
		pop	ADDRX
		pop	ADDRSEL
		inc 	_np_off
		
	_wnp_end:
		
	.endfunc