The problem that occurred: When Keil used the jlink downloader to download the program to the microcontroller, it suddenly got stuck. The indicator light of the jlink downloader went out and did not light up. Connecting the microcontroller board would also cause the microcontroller board to be short-circuited. At this time, I selected jlink under Debug in the keil magic wand configuration and found that it was no longer recognized. At first it was thought that some components of the downloader were short-circuited. Open the downloader shell, connect the power supply, and test several pins with a multimeter and find that they all have voltage. So we rule out hardware damage for now. After querying the data, it was found that the firmware inside the jlink downloader may be damaged and the firmware needs to be re-programmed.
Here we refer to the methods of several bloggers. In the end, the ones that were effective in personal testing were:
[https://blog.csdn.net/XiaoXiaoPengBo/article/details/80539932]
The blogger’s information is as follows:
Link: https://pan.baidu.com/s/1625KGchx0liqepCO3WKjlg
Extraction code: j4mr
Burned firmware file:
After the firmware is successfully programmed, open keil and select Jlink in Debug. You will be prompted. Click yes to see jlink automatically updated. (Note that when using the firmware burning applet, you must click NO on the second pop-up window, otherwise the update in keil will not be successful):
