芯片上电休眠或者JTAG禁用后怎么下载程序

—STM32器件，keil环境，一不小心上电就进入了待机模式，没法正常步骤下载程序了，怎么办？

—解决办法：按住芯片复位键不放，点击下载程序，编译环境会刷提示信息，此时快速释放复位键，一般即可下载成功。简而言之，按住复位键，点击下载程序，择机释放复位键。

JLink info:

DLL: V4.66 , compiled Mar 11 2013 11:00:46

Firmware: J-Link ARM V8 compiled Jul 17 2014 12:31:18

Hardware: V8.00

S/N : 286370559

Feature(s) : RDI,FlashDL,FlashBP,JFlash

JLink Info: Found SWD-DP with ID 0x2BA01477

JLink Info: TPIU fitted.

JLink Info: ETM fitted.

JLink Info: FPUnit: 6 code (BP) slots and 2 literal slots

JLink Info: Found Cortex-M3 r2p0, Little endian.

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 0x2BA01477

JLink Info: TPIU fitted.

JLink Info: ETM fitted.

JLink Info: FPUnit: 6 code (BP) slots and 2 literal slots

JLink Info: Found Cortex-M3 r2p0, 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