Definition and precautions of genuine St link/v2 j-link jtag/swd pin

Hello everyone , I meet you again , I'm your friend, Quan Jun .

This article will introduce ST-LINK Definition of pins and SWD Wiring mode , It will introduce the official ST-LINK Failure to recognize the chip and the solution .

Refer to figure for physical pin ：

The key is coming. ： When there is no JTAG Interface , We can use SWD Wiring way , Used to be good and cheap （ shanzhai ） Of ST-link when , Just four wires （SWIO,SWCLK,3V3,GND） The target board connection can be easily realized , Simple and small , It is the favorite of the embedded siege lion ！

But replace it with a genuine one ST-link/V2, Or four lines （SWIO,SWCLK,3V3,GND） If you connect , Will appear No target connected The problem of .

take it easy , Take your time to find out what the problem is ？ After several blind tosses , Find and then connect with the genuine ST-link/V2 Of TVCC After pin ,MDK The chip was successfully identified , original TVCC Is the power balance input pin , But not as MCU The power supply pin of .VCC yes ST-LINK/V2 Power supply inside the equipment ,TVCC Connect the power supply of the target board , The full name is Target VCC So now we have five wires connected （SWIO,SWCLK,3V3,GND,TVCC）, If OCD has to use four threads , Then you can put 3V3 and TVCC Connect to use together , Now let's enjoy using it fast 、 A genuine downloader with stable performance ！

Interested students can learn about the actual project of SCM development ：

Introduction to SCM development — Play from scratch FRDM-KL25Z_ Zhi Xiaoxing's blog -CSDN Blog

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