[求助] Msp430 编写汇编语言，求四个数中的最小值，并用LED显示其位置

16906 2014-2-7 02:45 楼主

电子系大一新生，刚刚接触到msp430单片机。刚刚得到一个task是用汇编语言在四个数中找出其中的最小值，并用led显示其位置。。。。
这个是task的原文：
Task 2:

Write a program in assembly to find the the location of the smallest value in an array that contains 4 values of type int. e.g. given the array 1024, 520, 56, 670 your code should return location 2. The location should be displayed to the user in binary using the red and green LED on the MSP430 Launchpad.

然后在老师的blog里找到了一个很相似的，是找出一组数中的最大值
BIS.B #0xFF,&P1DIR ; Set port1 as output
BIC.B #0x01,&P1OUT ; clear bit0
; Main loop here
start: MOV.W #0, R7 ; initialise max value register
MOV.W #arr1, R4 ; load the starting address of the array1 into the register R4
loop: MOV.W @R4+,R5 ; load the value stored at the address in register R4 into R5
CMP.W #0000h,R5 ; check for end of array delimiter '0'
JZ done ; if end of array jump to done
CMP.W R7,R5 ; compare current value with max value
JGE update ; if current value is larger than max value jump to update
JMP loop

update: MOV.W R5,R7 ; move current value into max value register
JMP loop ; jump to loop

done: BIS.B #0x01,&P1OUT ; set bit 0 to indicate done
JMP start ; return to start

arr1: .word 1,2,3,4,5,7,6,0 ; array of 16 bit integers (with '0' delimiter)

问题的关键就在于怎样输出最小值得位置啊，快到deadline真的是憋不出来。。。。真的不懂汇编啊，求大神教下要怎样用LED输出位置