initc5402.asm

5402DSP程序设计语言

    .include MMRegs.h
	.global _InitC5402
_InitC5402:
	NOP
	NOP
	NOP
    LD     #0, DP               ; reset data-page pointer

******* Disable All Interrupts *******
      SSBX  INTM                  ; disable (mask) global(CPU) intrpts 
      STM   #0x0000, IMR          ; disable peripheral interrupts
      STM   #0xFFFF, IFR          ; clear the intrupts' flags
      	
******* Configure C5402 System Registers *******
      STM   #0x3FE1,PMST
      STM   #0x7FFF, SWWSR        ; 7 wait cycle for IO space &
                                  ;  data&prog spaces 
      STM   #0x0001,SWCR          ; SWSM = 1 Wait states in SWWSR are multiplied by 2                            
      STM   #0x7000,BSCR          ; 0=RES BH=0 The bus holder is disabled.
                                  ; HBH = 0 hpi bus holder is disabled.
                                  ;IACKOFF = 0 The IACK signal output off function is disabled
                                  ;DIVFCT = 11 CLKOUT is divided by 4 from the DSP clock
                                  ;CONSEC = 0 Bank-switching on 32K bank boundaries only.
      STM   #0x1800,ST0           ; ST0 at default setting
      STM   #0x2900,ST1           ; ST1 at default (note:INTX=1)
                ; MC mode&OVLY=1, vectors at 3F80h
                                  ;DROM=1   OVLY=1  
****** Set up Timer Control Registers *******     
      STM   #0x0010, TCR          ; stop on-chip timer0 
      
	nop
	nop
	nop
	stm     #0H, CLKMD
	stm     #0H, CLKMD 
	nop
	nop
	nop ;switch to DIV mode clkout= 1/2 clkin
    stm      #0F007h, CLKMD ;switch to PLL X 5 mode
statu:
	ldm      CLKMD, A
	and      #01b, A ;poll STATUS bit
	bc       statu, AEQ
	
    STM   #0FFFFH,IFR
    STM   #0x0000, IMR          ; able MCBSP0 RX TX INTERRUPT
	NOP
	NOP
	RET