问题描述
我目前正在开发一个STM32F302VB，我需要执行软件复位。在我所有的previous项目（STM32F427和STM32F030C8），我一直使用的NVIC_SystemReset（）函数成功。但由于某些原因，它不会以这种芯片的工作。
实施是在CMSIS core_cm4.h和如下：
I'm currently developing on a STM32F302VB and I need to perform a software reset. On all my previous projects (with STM32F427 and STM32F030C8), I've always used the NVIC_SystemReset() function successfully. But for some reason it won't work with this chip.The implementation is in CMSIS core_cm4.h and is as follows:
__STATIC_INLINE void NVIC_SystemReset(void)
{
__DSB(); /* Ensure all outstanding memory accesses included buffered write are completed before reset */
SCB->AIRCR = ((0x5FA << SCB_AIRCR_VECTKEY_Pos) |
(SCB->AIRCR & SCB_AIRCR_PRIGROUP_Msk) |
SCB_AIRCR_SYSRESETREQ_Msk); /* Keep priority group unchanged */
__DSB(); /* Ensure completion of memory access */
while(1); /* wait until reset */
}
该函数被调用，所有的指令都执行，但卡住了while循环，并重置从未发生过。然后，我有通过JTAG重置把它弄出来的状态。
The function is called and all instructions are executed, but it gets stuck in the while loop, and reset never happens. I then have to reset it via JTAG to get it out of that state.
我查了编程手册和实现似乎罚款（并不奇怪，因为它完美对F4和F0）。
I checked the programming manual and the implementation seems fine (not surprising since it works perfectly on F4 and F0).
我真的不知道这个问题可能是什么，是否有人有一个想法，这是怎么回事？
I really don't know what the problem might be, does someone have an idea what's going on?
编辑：该功能仍然没有工作，但作为一种解决方法，功能卡后，我拉下NRST引脚再起来。它的丑陋，但它的作品现在。我宁愿做这一切在软件虽然。
The function is still not working but as a workaround, after the function gets stuck, I pull down the nRST pin and then up. It's ugly, but it works for now. I would rather do it all in software though.
推荐答案
托尼·K的就在他的评论，NRST引脚确实被拉高外，因为路由错误。
Tony K was right in his comment, the nRST pin was indeed being pulled high externally, because of a routing mistake.
出乎我的想法，NRST引脚是考虑到即使在软件复位：参考手册说：[重置]来源行事NRST引脚上，并在延迟阶段始终保持在较低水平，所以我应该知道！
And contrary to what I thought, the nRST pin is taken into account even in a software reset: the reference manual says: "[Reset] sources act on the NRST pin and it is always kept low during the delay phase", so I should have known!
删除上拉的伎俩，现在可以按预期的NVIC_SystemReset（）函数！
Removing the pull-up did the trick, the NVIC_SystemReset() function now works as expected!
非常感谢你！
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