所有官方例程以及自己写的非常简单的小程序，build是无错误，debug时会出现各种错误。如下时一个经常出现的错误：
Error connecting to the target:
(Error -1170 @ 0x0)
Unable to access the DAP. Reset the device, and retry the operation. If error persists, confirm configuration, power-cycle the board, and/or try more reliable JTAG settings (e.g. lower TCLK).
