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tms320f2808 解锁失败



新焊接的电路板,程序可以下载至RAM 中运行,但烧写至FLASH时,unlock failed!,芯片我也换了好几片了。同样的现象。电脑及编程器的原因可以排除,因为我可以烧写tms 320f2812( jtag电路图不一样),下面是我的JTAG连接图!