SWD cannot be downloaded, what is the reason? ?

wdliming

SWD cannot be downloaded, what is the reason? ? [Copy link]

JLink info: ------------ DLL: V6.30h, compiled Mar 16 2018 18:02:51 Firmware: J-Link V9 compiled Mar 2 2018 17:07:57 Hardware: V9.40 S/N: 59425868 Feature(s): RDI, GDB, FlashDL, FlashBP, JFlash, RDDI * JLink Info: STM32 (connect): Can not attach to CPU. Trying connect under reset. * JLink Info: STM32 (connect): Can not attach to CPU. Trying connect under reset. ***JLink Error: STM32: Connecting to CPU via connect under reset failed. Error: Flash Download failed - Target DLL has been canceled Flash Load finished at 15:23:01

qwerghf

Connect the reset and see

wsmysyn

1. First confirm whether SWD is correctly connected. 2. Check whether SWD io is remapped. If it is remapped, press and hold reset, then click download. After clicking download, wait for about 1 second and then release reset to start downloading. 3. Other issues:

bqgup

Generally, four wires are enough for SWD download, PA13, PA14, +3.3V, GND. You can search the schematic diagram of stlink emulator or jlink emulator on the Internet and connect the wires according to the schematic diagram. The premise is that your program and your MCU device are matched well, such as STM32C8T6 and STM32ZET6 and other models must be matched well, and the capacity of the MCU must also be configured well. Good luck to the OP.

szkalwa

If the DATA/CLK line of LAYOUT is too thin, the download will fail. In addition, if the 3.3V is also provided by SWD, it is best to do a good job of filtering.

zhulaee

Is jlink the same as swd?

gs001588

* JLink Info: STM32 (connect): Can not attach to CPU. Trying connect under reset. Check if your device can be recognized. If the device cannot be recognized, you must connect the hardware reset tube of the MCU to the JLink. Check if you have run a low-power program, or if the program has disabled the SWD port, or if the Flash has been read-protected. Or if you have pulled BOOT0 high to prevent the device from booting from the Flash.

tiankai001

On the MSP430 microcontroller, if the SBW mode is used, the C in the RC circuit on the reset port needs to be removed.

hujj

Pull BOOT0 high and BOOT1 low, then try downloading again.

wdliming

Thank you for the guidance of the great gods above, it is now fine~~