K60系列学习（四）Start.s启动代码分析

最新推荐文章于 2023-12-26 12:05:54 发布

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最新推荐文章于 2023-12-26 12:05:54 发布 · 1.7k 阅读

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本文详细剖析了K60系列微控制器的启动代码Start.s，从汇编语言层面探讨了MCU初始化的过程，包括堆栈设置、内存布局配置、寄存器初始化等关键步骤，为理解MCU的启动流程提供了深入见解。

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=源代码Start.s=
.section .vector, "a"
    .global init_vector
    .code 16
    .syntax unified
 init_vector:
    .word   __onchip_ram_end,system_start
    .word   0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0 
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0 
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0 
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0 
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0
    .word   0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0   
    .word   0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFE
    
    .text
    .global system_start
	.code 16
	.syntax unified
	.type system_start, function
system_start:
	cpsid f   /* disable all exceptions */

	/* 初始化GPRs */
	mov     r0,#0
	mov     r1,#0
	mov     r2,#0
	mov     r3,#0
	mov     r4,#0
	mov     r5,#0
	mov     r6,#0
	mov     r7,#0
	mov     r8,#0
	mov     r9,#0
	mov     r10,#0
	mov     r11,#0
	mov     r12,#0

    /*
	 *  msp setting
     */
	mov r0, #0
	msr control, r0
	isb

	/*
     * set default stack pointer
     */
	ldr r0, =__on