JLink Warning: CPU could not be halted
第二版原理图，芯片STM32F103C8T6，KEIL开发环境，JLINK V8仿真器，VCC/GND/SWD/SWI四线仿真模式，出现的问题是能下载程序也能正常运行，但是不能调试，一旦调试，就会出现下面报错：
***JLink Error: CPU is not halted
**JLink Warning: CPU could not be halted
***JLink Error: Can not read register 15 (R15) while CPU is running
***JLink Error: Can not read register 16 (XPSR) while CPU is running
***JLink Error: Can not read register 0 (R0) while CPU is running
***JLink Error: Can not read register 1 (R1) while CPU is running
***JLink Error: Can not read register 2 (R2) while CPU is running
***JLink Error: Can not read register 3 (R3) while CPU is running
***JLink Error: Can not read register 4 (R4) while CPU is running
***JLink Error: Can not read register 5 (R5) while CPU is running
***JLink Error: Can not read register 6 (R6) while CPU is running
***JLink Error: Can not read register 7 (R7) while CPU is running
***JLink Error: Can not read register 8 (R8) while CPU is running
***JLink Error: Can not read register 9 (R9) while CPU is running
***JLink Error: Can not read register 10 (R10) while CPU is running
***JLink Error: Can not read register 11 (R11) while CPU is running
***JLink Error: Can not read register 12 (R12) while CPU is running
***JLink Error: Can not read register 13 (R13) while CPU is running
***JLink Error: Can not read register 14 (R14) while CPU is running
***JLink Error: Can not read register 15 (R15) while CPU is running
***JLink Error: Can not read register 16 (XPSR) while CPU is running
***JLink Error: Can not read register 17 (MSP) while CPU is running
***JLink Error: Can not read register 18 (PSP) while CPU is running
***JLink Error: Can not read register 20 (CFBP) while CPU is running
网上有很多中说法，有说复位电路问题，换电阻、电容解决了的（阻容匹配不好引起的问题吗？）；有换驱动版本解决的；有将复位设置成Core and Peripherals解决的；有说下载线太长的缘故；有说是BOOT0、BOOT1管脚的问题，一动BOOT1后就出现这些报错，有说降低速度解决的。
最初我是将复位改成Core and Peripherals，问题解决，如下图
随后又进行了换短下载线的测试，将Reset选项换回Normal模式，将下载线换成4根短线进行了测试，问题也解决，能正常调试了（在第一版中，做了个20cm转接4线的转接下载线，加上仿真器自带的20cm的20线下载线，共40cm长的下载线，在第一版中使用正常，到这第二版就出了问题了）。
接着又换回40cm长的下载线，再debug，Reset选项依然是Normal模式，也不报错了，能正常下载调试了，呵呵，不明白的多了去了，追究不了，就这样吧，呵呵
过了一晚上再来过，呵呵，原来昨天的是幻觉，即便将Reset选项设置为Core and Peripherals，调试依然是报错，偶尔能好那么一下下，但是很快又是报错，雅蠛蝶，只好把下载线重新做成短的试试，做了根15cm长4线的，再调试，ok，整个世界清静了。