SDRAM试验

今天编写了一个小程序，全是熟悉开发板的。功能是这样的：

在开发板上，GPB0和GPB1上连接的是LED灯，想让它从0~3循环闪烁，程序在SDRAM中运行。

程序流程是这样的：关闭WATCHDOG,初始化SDRAM，把程序拷贝到SDRAM中，之后在运行。今天主要遇到的问题是编译的问题。我的工具链安装的位置是 /home/yuaf/guangpan/tools/../bin和环境变量添加的路径也是这里。若我写的程序在/home/yuaf/program里，这时用acc-linux-gcc工具链就编译不了。若程序在/home/yuaf/guangpan/hardware下就能编译，我就把环境变量改了。是在/etc/envirment里添加的。具体就是在/urs/local下新建一个目录，放置工具链下的/bin文件，只是把/bin文件拷贝在里面。结果不好使，导致原来好使的就不好使，就是所有的都编译不了啊。之后没有办法，还是得重新还原回去。还有在编译程序的时候，出现了

cc    -c -o head.o head.S
head.S: Assembler messages:
head.S:7: Error: no such instruction: `bl close_watchdog'
head.S:8: Error: no such instruction: `bl init_memery'
head.S:9: Error: no such instruction: `bl copy_steppingstone_to_sdram'
head.S:10: Error: no such instruction: `ldr pc,=on_sdram'
head.S:12: Error: no such instruction: `ldr sp,=0x34000000'
head.S:13: Error: no such instruction: `bl main'
head.S:15: Error: no such instruction: `b halt_loop'
head.S:18: Error: no such instruction: `ldr r0,=0x53000000'
head.S:19: Error: expecting operand after ','; got nothing
head.S:20: Error: invalid char '[' beginning operand 2 `[r0]'
head.S:21: Error: too many memory references for `mov'
head.S:23: Error: no such instruction: `ldr r0,=SDRAM_BASE'
head.S:24: Error: expecting operand after ','; got nothing
head.S:25: Error: expecting operand after ','; got nothing
head.S:27: Error: no such instruction: `ldr r4,[r1],'
head.S:28: Error: invalid char '[' beginning operand 2 `[r0]'
head.S:29: Error: too many memory references for `cmp'
head.S:30: Error: no such instruction: `bne l'
head.S:31: Error: too many memory references for `mov'
head.S:34: Error: no such instruction: `ldr r0,=MEM_CTL_BASE'
head.S:35: Error: no such instruction: `ldr r1,mem_cfg_val'
head.S:36: Error: too many memory references for `add'
head.S:38: Error: no such instruction: `ldr r3,[r1],'
head.S:39: Error: invalid char '[' beginning operand 2 `[r0]'
head.S:40: Error: too many memory references for `cmp'
head.S:41: Error: no such instruction: `bne r'
head.S:42: Error: too many memory references for `mov'
make: *** [head.o] 错误 1

如下错误，最开始我怀疑是我在vim里面写的有错误，可是重新写了，还是出现同样的错误。然后，我就没有用make了，我用acc-linux-gcc 这下就好使了，一直到最后的生成 .bin文件。我就以为是Makefile写错了，之后重新写了一遍， 之后就好使了。看来是Makefile里面写错了。以后得小心点。