44blib_a.s

用SDT开发的基于44B0板的PDA Demo程序. 这是北航出版的《嵌入式系统设计与开发例程详解-基于ARM的应用》附带光盘上的程序。

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