tms320f2808中文资料_tms320f2808_MAX5541ESA(3)

.sect "codestart"

code_start:

.if WD_DISABLE == 1

LB wd_disable ;Branch to watchdog disable code

.else

LB copy_sections ;Branch to copy_sections

.endif

这个函数从the C/C Header Files and Peripheral Examples提供的CodeStartBranch.asm文件修改而来，只是第二个调用用copy_sections代替了_c_int00。这个调用仅仅在WD_DISABLE为0时执行。 上面的代码，WD_DISABLE 被设置为1。这使得wd_disable运行。wd_disable的代码如下：

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

* Function: wd_disable

*

* Description: Disables the watchdog timer

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

.if WD_DISABLE == 1

.sect "wddisable"

wd_disable:

SETC OMODE ;Set OMODE 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 copy_sections ;Branch to copy_sections

.endif

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

* Function: wd_disable

*

* Description: Disables the watchdog timer

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

.if WD_DISABLE == 1

.sect "wddisable"

wd_disable:

SETC OMODE ;Set OMODE 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 copy_sections ;Branch to copy_sections

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