LPC MicrocontrollersのトピックRe: Info: Could not measure total IR len. TDO is constant high.

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

fumeilai1 — Wed, 03 Apr 2019 08:43:18 GMT

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？

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

FelipeGarcia — Thu, 04 Apr 2019 20:40:39 GMT

Hi wang xinwang,

Please try the following:

Regaining debug access to target MCU

Have a great day,
Felipe

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

fumeilai1 — Tue, 23 Apr 2019 09:08:30 GMT

还是这样，比如你给我发个程序，我能从软件上看，哪里有错误吗，串口能用啊串口打印输出啊

有程序吗？我加载测试一下呢

再比如我怎样打印输出，看系统工作是否ok，时钟是否正常，影响通信的问题是否存在？

这块板子，麻烦您帮我再看看，前面485通信出现过连接不成功，当时考虑可能和画板不规范有关，24V和5V用的一个地；可后来，莫名的485通信又都好了，没问题了。我怎么通过串口打印输出看看mcu内部工作状态呢或者通过串口命令查询呢

很多程序内部mcu状态信息都能用程序读出来吧

我看看吧只要打印相应地址内容就好了呗

只是没有调试器直观

我换一个新的肯定就好了，但是还是不知道原因。

这块儿应该怎么设置呢?

这个DBGSEL应该怎么设置？

"进入ISP模式，通过Flash Magic工具查看一下，MCU是否有被使能了CRP。"收到您上面的回复，我在flashnmagic里面具体怎么操作呢？

当我选成波特率9600时是可以isp下载程序目标文件的，可是isp无法进行其它操作，比如读id签名啥的，都不行。

致敬！

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

FelipeGarcia — Tue, 23 Apr 2019 15:17:21 GMT

Hi wang xinwang,

For a better understanding. Could you please submit your question in English?

Regards,

Felipe

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

fumeilai1 — Wed, 24 Apr 2019 01:07:52 GMT

jtag is failed , why? iSP download is ok. user's programs run ok ; Sometime 485 communication link fails; Jtag link failed always ;

How about the DBGSEL , What does it matter? How to set it up ?

How should I set them here ?

How should I see the CRP through flashmagic ? The flashmagic pop message that " the device (LPC2104) doesn't support the operation " when I read the signatures through ISP with the FlashMagic ; I can download program obj through Flashmagic in 9600 baud rate .

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

fumeilai1 — Wed, 24 Apr 2019 01:27:00 GMT

jtag is failed , why? iSP download is ok. user's programs run ok ; Sometime 485 communication link fails; Jtag link failed always ;

How about the DBGSEL , What does it matter? How to set it up ?

How should I set them here ?

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

fumeilai1 — Wed, 24 Apr 2019 01:27:29 GMT

jtag is failed , why? iSP download is ok. user's programs run ok ; Sometime 485 communication link fails; Jtag link failed always ;

How about the DBGSEL , What does it matter? How to set it up ?

How should I set them here ?

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

fumeilai1 — Wed, 24 Apr 2019 01:29:22 GMT

jtag is failed , why? iSP download is ok. user's programs run ok ; Sometime 485 communication link fails; Jtag link failed always ; How about the DBGSEL , What does it matter? How to set it up ? How should I set them here ? How should I see the CRP through flashmagic ? The flashmagic pop message that " the device (LPC2104) doesn't support the operation " when I read the signatures through ISP with the FlashMagic ; I can download program obj through Flashmagic in 9600 baud rate .

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

fumeilai1 — Wed, 24 Apr 2019 03:40:45 GMT

Is that I had soldered the MCU chip broken ?

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

r_ynfaxy — Wed, 24 Apr 2019 05:01:37 GMT

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

fumeilai1 — Wed, 24 Apr 2019 06:44:51 GMT

Why the ISP reading and downloading does not always work ? Well , the ISP downloading just work at 9600 baud rate, why ? What should i check ?

ISP 下载总是失败，需要反复上电复位拉低ISP，我的ISP操作应该对，即使偶尔成功，也只能工作在9600波特率？为什么？

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

1429011742 — Sun, 28 Apr 2019 06:04:06 GMT

请问你是否已经解决这个问题，我这里也碰到这样的问题了。

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

fumeilai1 — Mon, 29 Apr 2019 09:08:22 GMT

没有解决，技术支持没有，在论坛里留言吧！继续发帖吧

在 2019-04-28 14:14:41，"1429011742@qq.com" <admin@community.nxp.com> 写道：

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

reply from rio li in LPC Microcontrollers - View the full discussion

请问你是否已经解决这个问题，我这里也碰到这样的问题了。

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

fumeilai1 — Mon, 29 Apr 2019 09:52:15 GMT

到现在没解决，换了MCU还不行呢！有人能远程连线帮我诊断一下吗？NXP能人们？

Even I soldered a new MCU , the jtag chain still does not link the mcu ; The mcu ID is not readable . Why? Is there someone remote diagnosis it for me?

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

FelipeGarcia — Mon, 29 Apr 2019 20:10:42 GMT

Hi wang xinwang,

Are you erasing the flash sectors before trying to flash the device?

Regards,

Felipe