44blib_a.s

来自「嵌入式系统设计与开发实例详解－－基于ARM的应用（采用ARM7TDMI内核的、三」· S 代码 · 共 28 行

BIT_EINT4567		EQU     (0x1<<21);#define BIT_EINT4567	(0x1<<21)
I_ISPC		        EQU		0x1e00024

	AREA |C$$code|, CODE, READONLY
	
	IMPORT EXINT4isr
	IMPORT IrqStart
	IMPORT IrqFinish

	EXPORT	ChangeMemCon
;*************************************************************************
;*	The function for changing the Bank control and refresh registers) *
;**************************************************************************
;void ChangeMemCon();
ChangeMemCon
    stmfd   sp!,{r4-r9}	    ;Assembler uses the high registers(r4~). 
	   
    ldmia   r0,{r1-r9}
    ldr	    r0,=0x01c80004  ;BANKCON0 Address
    stmia   r0,{r1-r9}

    ldmfd   sp!,{r4-r9}

    mov	    pc,lr

    
	END