笔者使用Keil开发环境对STM32L Discovery进行开发，更新一次firmware后就不能连接目标板了,报错Internal command error Flash download failed target dll has been can。最后将Keil更新至4.60就可了。
使用过程中笔者发现，当目标板的芯片处于休眠的时候，在尝试连接目标板时候也会出现报错Internal command error Flash download failed target dll has been can的现象，解决办法是使目标板退出休眠，即按住reset键再下载程序。 |
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