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dsp串口烧写问题 sdflash

用sdflash烧写程序,先用软件中的 xxxxtest.out文件烧写成功,但用我自己的.out文件烧写就不成功,就是文件大小不一样,.cmd也是改成了flash的,这是什么原因?是否是串口有问题?还是代码问题?