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Info: Could not measure total IR len. TDO is constant hig

Question asked by wang xinwang on Apr 3, 2019

Info: Could not measure total IR len. TDO is constant high. Invalid core Id. (0x00000000)  What's wrong ?

我后来换了很多MCU,还是jtag不通,软件也设置了很多遍;MCU运行程序没有问题,ISP下载也没问题,串口收发都没问题;后来我按照LPC2104的产品手册,把RCK引脚拉高了,还是不行,把其它TDI TDO TMS等引脚上拉下来电阻都去掉,还是jtag不通。能是什么原因呢?

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