dsp_init.s54

c5x中关于codec的实验

;****************************************************************
;                       RS232 DEMO
;  Copyright (c) 2001 SJTU DSP Tech. Center. All Rights Reserved.
;  History:
;		Date		Authors			
;		2002/08/12	ChenShanrong	
;*****************************************************************
	.mmregs

	.include "uartasm.h54"

	.text

;************************************
;Function: DSPInit
;Description:
;	DSP initialtion
;Input :
;	None
;Output:
;	None
;************************************
DSP_Init:

	;close other interrupt first
	ssbx	INTM
	;set st1,相当于CPL=1,OVM=0,SXM=1,C16=0,FRCT=1,CMPT=0
	stm		#0x6140, ST1

	;init PMST (IPTP=0x1, /MC, OVLY=1)
    stm    #0000000010100000b,  PMST

	;set for interrupt
	;IFR  clear pending interrupt
	stm    #1111111111111111b, IFR
	;IMR  (INT1=1)
	stm    #0000000000000010b, IMR

	;set SWWSR, I/O wait 3 cycles
	stm    #0011000000000000b,  SWWSR

    ;set clock mode:
	stm  #0b, CLKMD		;switch to DIV mode
TstStatu:
	ldm  CLKMD, A
	and  #1b, A		;check STATUS bit
	bc  TstStatu, ANEQ
	;CLOCKIN=20MHz, select PLL*5, CLOCK=100MHz
	stm  #0100011111111111b, CLKMD

	ret

;end of dsp_init.s54