readfifo.s79

IARSOURCECODE是基于LPC2478嵌入式软件IAR EWARM V4.42的应用实例代码

                NAME MCIFIFO
                RSEG MCIFIFO:CODE(2)
                CODE32

		EXPORT MCI_ReadFifo
		EXPORT MCI_WriteFifo

		; int MCI_ReadFifo(unsigned int * dest);
		; int MCI_WriteFifo(unsigned int * src);

MCI_ReadFifo:
		STMFD   sp!,{r4,r5,r12,lr}
		LDR     r4, mci_fifo
		MOV     r5, r0
		LDMIA   r4, {r0-r3}
		STMIA   r5!, {r0-r3}
		LDMIA   r4, {r0-r3}
		STMIA   r5!, {r0-r3}
		MOV     r0, r5
		LDMFD   sp!,{r4,r5,r12,pc}

MCI_WriteFifo:
		STMFD   sp!,{r4,r5, r12,lr}
		LDR     r5, mci_fifo
		MOV     r4, r0
		LDMIA   r4!, {r0-r3}
		STMIA   r5, {r0-r3}
		LDMIA   r4!, {r0-r3}
		STMIA   r5, {r0-r3}
		MOV     r0, r4
		LDMFD   sp!,{r4,r5,r12 ,pc}

mci_fifo        DCD     0xE008C080
        END