（已解决）SensorTile下载出现Can not attach to CPU. Trying connect under reset.

littleshrimp

（已解决）SensorTile下载出现Can not attach to CPU. Trying connect under reset. [复制链接]

下午在用SensorTile调试Beacon程序使用STM32CubeExpansion_BLE1_V2.8.0\Projects\Multi\Applications\Beacon例程

很顺利，已经能通过BLE发送广播数据
ANDROID也可以正常接收

于是小睡一觉
醒来后简单修改了几段程序
再用IAR下载时就提示错误
试了很多次，重启了电脑也不行
又用MDK的设置看一下能不能找到芯片
结果选择SWD的时候就卡一会，然后MDK就会退出
几次都是这样

这些操作曾经都是好用的
于是又使用SEGGER文件夹里的J-Flash Lite试试
原来也是好用的
现在J-Flash Lite提示
Device "STM32L476RG" selected.
Found SWD-DP with ID 0x2BA01477
STM32 (connect): Can not attach to CPU. Trying connect under reset.
Found SWD-DP with ID 0x2BA01477
STM32: Connecting to CPU via connect under reset failed.

能找到单片机，可就是下载不了
最后看到“under reset”这段
在点下载前先按住开发板上的RESET键
点击下载
然后松开RESET键看到错误信息不一样了

Downloading D:\10.stsensor\2.code\STSW-STLKT01\Utilities\BootLoader\STM32L476RG\BootLoaderL4.bin to STM32L476RG via SWD-Interface@1000kHz
Programming Thread started.
Device "STM32L476RG" selected.
Found SWD-DP with ID 0x2BA01477
STM32 (connect): Can not attach to CPU. Trying connect under reset.
Found SWD-DP with ID 0x2BA01477
Found SWD-DP with ID 0x2BA01477
AP-IDR: 0x24770011, Type: AHB-AP
Found Cortex-M4 r0p1, Little endian.
FPUnit: 6 code (BP) slots and 2 literal slots
CoreSight components:
ROMTbl 0 @ E00FF000
ROMTbl 0 [0]: FFF0F000, CID: B105E00D, PID: 000BB00C SCS
ROMTbl 0 [1]: FFF02000, CID: B105E00D, PID: 003BB002 DWT
ROMTbl 0 [2]: FFF03000, CID: B105E00D, PID: 002BB003 FPB
ROMTbl 0 [3]: FFF01000, CID: B105E00D, PID: 003BB001 ITM
ROMTbl 0 [4]: FFF41000, CID: B105900D, PID: 000BB9A1 TPIU
ROMTbl 0 [5]: FFF42000, CID: B105900D, PID: 000BB925 ETM
STM32 (connect): Timeout while waiting for CPU to halt after reset. Manually halting CPU.
Debugger initialized successfully.
J-Link: Flash download: Flash programming performed for 1 range (6144 bytes)
J-Link: Flash download: Total time needed: 0.345s (Prepare: 0.120s, Compare: 0.007s, Erase: 0.068s, Program: 0.136s, Verify: 0.001s, Restore: 0.010s)
Programming Thread exited
Programming failed.

再点下载提示成功

Downloading D:\10.stsensor\2.code\STSW-STLKT01\Utilities\BootLoader\STM32L476RG\BootLoaderL4.bin to STM32L476RG via SWD-Interface@1000kHz
Programming Thread started.
Device "STM32L476RG" selected.
Found SWD-DP with ID 0x2BA01477
Found SWD-DP with ID 0x2BA01477
AP-IDR: 0x24770011, Type: AHB-AP
Found Cortex-M4 r0p1, Little endian.
FPUnit: 6 code (BP) slots and 2 literal slots
CoreSight components:
ROMTbl 0 @ E00FF000
ROMTbl 0 [0]: FFF0F000, CID: B105E00D, PID: 000BB00C SCS
ROMTbl 0 [1]: FFF02000, CID: B105E00D, PID: 003BB002 DWT
ROMTbl 0 [2]: FFF03000, CID: B105E00D, PID: 002BB003 FPB
ROMTbl 0 [3]: FFF01000, CID: B105E00D, PID: 003BB001 ITM
ROMTbl 0 [4]: FFF41000, CID: B105900D, PID: 000BB9A1 TPIU
ROMTbl 0 [5]: FFF42000, CID: B105900D, PID: 000BB925 ETM
Debugger initialized successfully.
J-Link: Flash download: Flash download skipped. Flash contents already match
Programming Thread exited
Programming done

再用IAR和MDK就都可以正常下载了
又下载了Beacon例程
然后又出现这个问题

顿时天空漂过5个字儿“低功耗"