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正版ST-link/V2 J-LINK JTAG/SWD引脚定义和注意事项
2022-06-28 18:01:00 【全栈程序员站长】
大家好,又见面了,我是你们的朋友全栈君。
本文将介绍ST-LINK引脚的定义和SWD的接线方式,其中会介绍官方ST-LINK识别不到芯片的情况以及解决方法。
实物引脚参照图:
重点来了:当板子上没有JTAG接口时,我们可以使用SWD接线方式,以前使用物美价廉(山寨)的ST-link时,只需要四根线(SWIO,SWCLK,3V3,GND)就可以轻松实现目标板连接,简单小巧,可谓是嵌入式攻城狮的最爱!
但是换成正版的ST-link/V2,还是四线(SWIO,SWCLK,3V3,GND)连接的话,就会出现No target connected的问题。
别着急,慢慢来找问题出在哪里?经过几次瞎折腾,发现再连上正版ST-link/V2 的 TVCC引脚后,MDK成功识别到了芯片,原来TVCC是电源平衡输入引脚,但不能作为MCU的供电引脚。VCC是ST-LINK/V2设备内部的电源,TVCC接目标板的电源,全称是Target VCC 所以我们现在连了五根线(SWIO,SWCLK,3V3,GND,TVCC),要是强迫症非要使用四根线的话,那么可以将3V3和TVCC连接到一起使用,现在让我们尽情的使用速度快、性能稳定的正版下载器吧!
有兴趣的同学可以学习一下单片机开发实战项目:
单片机开发入门—从零开始玩转FRDM-KL25Z_智小星的博客-CSDN博客
发布者:全栈程序员栈长,转载请注明出处:https://javaforall.cn/132638.html原文链接:https://javaforall.cn
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