bootbranch.asm

来自「TMS320F2812的bootloader源程序」· 汇编 代码 · 共 43 行

********************************************************************
*	boot start code branch 
*	Write by: PangCheng  
*	Company : Sysokean Nanning GX LTD.
*	Date: 2005-7-14
********************************************************************

WD_DISABLE	.set	1		;set to 1 to disable WD, else set to 0

    .ref _c_int00
;***********************************************************************
;* Function: codestart section
;*
;* Description: Branch to code starting point
;***********************************************************************
    .sect "CodeStart"
code_start:
    .if WD_DISABLE == 1
        LB wd_disable       ;Branch to watchdog disable code
    .else
        LB _c_int00         ;Branch to start of boot.asm in RTS library
    .endif
;end codestart section

***********************************************************************
* Function: wd_disable
*
* Description: Disables the watchdog timer
***********************************************************************
    .if WD_DISABLE == 1
    .text
wd_disable:
    SETC OBJMODE        ;Set OBJMODE for 28x object code
    EALLOW              ;Enable EALLOW protected register access
    MOVZ DP, #7029h>>6  ;Set data page for WDCR register
    MOV @7029h, #0068h  ;Set WDDIS bit in WDCR to disable WD
    EDIS                ;Disable EALLOW protected register access
    LB _c_int00         ;Branch to start of boot.asm in RTS library
    .endif
;end wd_disable
	.end
; end of file CodeStartBranch.asm