我正在尝试编写一个程序,该程序从.dat文件中读取与LED模拟器中显示的不同颜色对应的字符; x = off,R = red等。我的问题是,我无法弄清楚我在打开.dat文件时做了什么错误。我环顾四周,尝试了所有我能想到的,但每次组装并运行时,我都会在$ v0中得到-1表示错误。这里是我的开/读码/关闭文件:用MIPS汇编阅读文件
.data
fin: .asciiz "maze1.dat" # filename for input
buffer: .asciiz ""
.text
#open a file for writing
li $v0, 13 # system call for open file
la $a0, fin # board file name
li $a1, 0 # Open for reading
li $a2, 0
syscall # open a file (file descriptor returned in $v0)
move $s6, $v0 # save the file descriptor
#read from file
li $v0, 14 # system call for read from file
move $a0, $s6 # file descriptor
la $a1, buffer # address of buffer to which to read
li $a2, 1024 # hardcoded buffer length
syscall # read from file
# Close the file
li $v0, 16 # system call for close file
move $a0, $s6 # file descriptor to close
syscall # close file
文件maze1.dat是在同一目录MIPS计划。任何帮助或建议非常感谢。