F407 SWD下载问题

航

自己做的板子，SWD下载出问题，用的原子哥的源码下载的每次都是第一次下载可以，第二次就不行了，但是别人给的一个工程可以多次下载完全没问题。看了很多按住复位然后松开下载的尝试很多次，必须断电再开启，还看运气能否下进去，用串口下载擦除之后确实可以。程序源码就用最简单的LED的也无法二次下载，里面swd用到的两个口程序里面也没用过。不知道根本原因是什么。哪位大神也遇到过，求解答呀


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
Feature(s) : RDI,FlashDL,FlasGDBFULLash,GDBFull

* JLink Info: Found SWD-DP with ID 0x2BA01477
* JLink Info: STM32F2xxx/STM32F4xxx: Can not attach to CPU. Trying connect under reset.
* JLink Info: Found SWD-DP with ID 0x2BA01477
Error: Flash Download failed  -  Target DLL has been cancelled

航

这个是可以正常下载的工程的信息：
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
Feature(s) : RDI,FlashDL,FlasGDBFULLash,GDBFull

* JLink Info: Found SWD-DP with ID 0x2BA01477
* JLink Info: Found SWD-DP with ID 0x2BA01477
* JLink Info: Found Cortex-M4 r0p1, Little endian.
* JLink Info: FPUnit: 6 code (BP) slots and 2 literal slots
* JLink Info: TPIU fitted.
* JLink Info: ETM fitted.
ROMTableAddr = 0xE00FF003

Target info:
------------
Device: STM32F407VG
VTarget = 3.313V
State of Pins:
TCK: 0, TDI: 0, TDO: 0, TMS: 1, TRES: 1, TRST: 1
Hardware-Breakpoints: 6
Software-Breakpoints: 8192
Watchpoints:          4
JTAG speed: 500 kHz

Erase Done.
Programming Done.
Verify OK.
Application running ...

航

可以正常下载的工程里面有这个设置，不知道是不是这个原因

honglang2222

是不是硬件电路有问题

honglang2222

是不是硬件电路有问题