power.s

ARM嵌入式常用模块的原理图和源码

/*载入RCSR*/
	ldr r0, =RCSR
	ldr r1, [r0]
						/* 屏蔽 RCSR_HWR | RCSR_WDR| RCSR_AMR |RCSR_GPR */
	and r1, r1, #0xf
								/* 清除reset控制状态 */
	str r1, [r0]
								/*通过检查RCSR来判断是否是睡眠苏醒 */
	teq r1, #4
	beq WakeUp
WakeUp:
	ldr r0, =PSPR
	ldr r1, [r0]
	mov PC, r1

/*切换到睡眠状态*/
	mov r3, #0x3
	mcr p14, 0 ,Rx, c7, c0, 0