对ARM7 LPC2210的Bootloader源码分析

#if (Fcco / Fcclk) == 2
PLLCFG = ((Fcclk / Fosc) - 1) | (0 < 5);
#endif
#if (Fcco / Fcclk) == 4
PLLCFG = ((Fcclk / Fosc) - 1) | (1 < 5);
#endif
#if (Fcco / Fcclk) == 8
PLLCFG = ((Fcclk / Fosc) - 1) | (2 < 5);
#endif
#if (Fcco / Fcclk) == 16
PLLCFG = ((Fcclk / Fosc) - 1) | (3 < 5);
#endif
PLLFEED = 0xaa;
PLLFEED = 0x55;
while((PLLSTAT & (1 < 10)) == 0);
PLLCON = 3; // 按照特定的设置方式对PLL控制寄存器进行设置
PLLFEED = 0xaa;
PLLFEED = 0x55;

/* 设置存储器加速模块 */
MAMCR = 0;
#if Fcclk < 20000000
MAMTIM = 1;
#else
#if Fcclk < 40000000
MAMTIM = 2;
#else
MAMTIM = 3;
#endif
#endif
MAMCR = 2;

/* 初始化VIC */
/* initialize VIC*/
VICIntEnClr = 0xffffffff;
VICVectAddr = 0;
VICIntSelect = 0;

}

六、其它

;/*********************************************************************************************************
;** unction name 函数名称: __user_initial_stackheap
;** Descriptions 功能描述: Initial the function library stacks and heaps, can not deleted!
;** 库函数初始化堆和栈，不能删除
;** input parameters 输　入: reference by function library 参考库函数手册
;** Returned value 输　出 : reference by function library 参考库函数手册
;** Used global variables 全局变量: None 无
;** Calling modules 调用模块: None 无
;********************************************************************************************************/
__user_initial_stackheap
LDR r0,=bottom_of_heap
; LDR r1,=StackUsr
LDR r2,=top_of_heap
LDR r3,=bottom_of_Stacks
MOV pc,lr

StackSvc DCD SvcStackSpace + (SVC_STACK_LEGTH - 1)* 4
StackIrq DCD IrqStackSpace + (IRQ_STACK_LEGTH - 1)* 4
StackFiq DCD FiqStackSpace + (FIQ_STACK_LEGTH - 1)* 4
StackAbt DCD AbtStackSpace + (ABT_STACK_LEGTH - 1)* 4
StackUnd DCD UndtStackSpace + (UND_STACK_LEGTH - 1)* 4

;/*********************************************************************************************************
;** unction name 函数名称: CrpData
;** Descriptions 功能描述: encrypt the chip
;** input parameters 输　入: None 无
;** Returned value 输　出 : None 无
;** Used global variables 全局变量: None 无
;** Calling modules 调用模块: None 无
;********************************************************************************************************/
IF :DEF: EN_CRP
IF . >= 0x1fc
INFO 1,"\nThe data at 0x000001fc must be 0x87654321.\nPlease delete some source before this line."
ENDIF
CrpData
WHILE . < 0x1fc
NOP
WEND
CrpData1
DCD 0x87654321 ;/*When the Data is 为0x87654321,user code be protected. 当此数为0x87654321时，用户程序被保护 */
ENDIF

;/* 分配堆栈空间 */
AREA MyStacks, DATA, NOINIT, ALIGN=2
SvcStackSpace SPACE SVC_STACK_LEGTH * 4 ;Stack spaces for Administration Mode 管理模式堆栈空间
IrqStackSpace SPACE IRQ_STACK_LEGTH * 4 ;Stack spaces for Interrupt ReQuest Mode 中断模式堆栈空间
FiqStackSpace SPACE FIQ_STACK_LEGTH * 4 ;Stack spaces for Fast Interrupt reQuest Mode 快速中断模式堆栈空间
AbtStackSpace SPACE ABT_STACK_LEGTH * 4 ;Stack spaces for Suspend Mode 中止义模式堆栈空间
UndtStackSpace SPACE UND_STACK_LEGTH * 4 ;Stack spaces for Undefined Mode 未定义模式堆栈

AREA Heap, DATA, NOINIT
bottom_of_heap SPACE 1

AREA StackBottom, DATA, NOINIT
bottom_of_Stacks SPACE 1

AREA HeapTop, DATA, NOINIT
top_of_heap

AREA Stacks, DATA, NOINIT
StackUsr