STM32F103 SW 模式下，下载问题
jlink显示连接正常
但是在下载的时候报告错误如下
* JLink Info: Device "STM32F103C8" selected (64 KB flash, 20 KB RAM).
JLink info:
------------
DLL: V4.80g, compiled Feb 13 2014 20:50:02
Firmware: J-Link ARM V8 compiled Nov 28 2014 13:44:46
Hardware: V8.00
S/N : 17935099
Feature(s) : RDI,FlashDL,FlashBP,JFlash
* JLink Info: Found SWD-DP with ID 0x1BA01477
* JLink Info: Found SWD-DP with ID 0x1BA01477
* JLink Info: Found Cortex-M3 r1p1, Little endian.
* JLink Info: FPUnit: 6 code (BP) slots and 2 literal slots
* JLink Info: TPIU fitted.
ROMTableAddr = 0xE00FF003
**JLink Warning: S_RESET_ST not cleared
**JLink Warning: CPU did not halt after reset.
**JLink Warning: CPU could not be halted
* JLink Info: Core did not halt after reset, trying to disable WDT.
**JLink Warning: CPU did not halt after reset.
**JLink Warning: CPU could not be halted
**JLink Warning: S_RESET_ST not cleared
* JLink Info: Found SWD-DP with ID 0x1BA01477
* JLink Info: Found Cortex-M3 r1p1, Little endian.
**JLink Warning: S_RESET_ST not cleared
**JLink Warning: CPU did not halt after reset.
**JLink Warning: CPU could not be halted
* JLink Info: Core did not halt after reset, trying to disable WDT.
**JLink Warning: CPU did not halt after reset.
**JLink Warning: CPU could not be halted
**JLink Warning: S_RESET_ST not cleared
**JLink Warning: CPU could not be halted
Error: Flash Download failed-Target DLL has been cancelled
这个是什么问题啊？
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