pic24fj256g106编程问题该怎么解决？

亲爱的同事们，我对PIC24FJ系列设备有些困难，不知道是否有人能给我一些助手。我遇到过其他有相似问题的帖子，并且已经穷尽了上面提到的所有显而易见的东西，我对正在发生的事感到困惑。但是问题依然存在。顺便说一下，PicKit3有固件版本01.28.90、算法版本01.15.19和OS版本01.23.02。我是PIC24系列的新手，因此我做了相当多的在线搜索，例如汇编代码，我可以适应我的测试，并在一段时间之后发现一些有效的东西。我成功地获得了一些配置设置，并成功地将测试程序编译并下载到设备上。在这个问题上，我发现很难获得关于在汇编程序中使用什么术语来配置位的简明信息，所以希望指出正确的方向。工作好，频率似乎很低，在500千赫左右。我依赖于内部8MHz时钟，但是尽管如此，我还是希望输出频率快得多。Gram)希望是振荡器设置有问题，之后开始经历一些非常奇怪的结果，即，当下载一个程序时，我不断地得到“目标设备ID(00000000)与预期的设备ID(10190000)”不匹配！我试了几次，但结果相似，现在我确信我的3RDPIC24设备已经进入硅天堂！我不能擦除或编程设备，但它似乎读回OK。我注意到，一旦读取了设备，MPLAB的配置设置就会改变为奇怪的设置，我不记得选择了这些设置，并且怀疑设备是否真的被读回或者仅仅是读取垃圾！当检查设备是否为空时，我得到消息“以下内存区域失败空白检查：程序内存地址：00000000期望值：00ffffffffff接收值：00000000Blank检查失败。因此，我不确定我做错了什么，或者我确实烹调了这些PIC24设备。我也不确定是否有PACKIT3或MPLAB可能导致这些问题。我应该补充说，PIC的焊接到PCB上，并具有0.1uF去耦电容器。MLCR引脚通过一个11K电阻和引脚56（VCAP）有一个10uF钽电容绑高。所有的VSS引脚到地上，所有VDD引脚到3.3VDC电源从一个良好的质量工作台PSU。如果需要的话，我可以提供更多这方面的信息，并且在阅读设备之前和之后还可以看到MPLAB配置位的屏幕截图，以防万一。我真的不想再烹饪PIC24设备了，直到我能够发现什么或者如果我做错了什么，所以非常感谢你的帮助。p与此。最后，我应该指出，我已经用相同的软件对许多PIC16和PIC18系列设备进行了编程，尽管PicKit2程序员没有出现任何问题或故障。ENVREG输入管脚是浮动的，一旦连接到+3.3V电源上，程序员就能够再次看到设备，并且我能够像金子一样地读取、擦除和重新编程PIC。我试过几次回复您最后的帖子，但是由于一些奇怪的原因，网站不允许我这样做！大多数集市



      以下为原文

    Dear colleagues

I am having some difficulties with PIC24FJ series device and wonder if someone here can offer some assistant please. I have come across other posts with similar issues and having exhausted all the obvious things mentioned I am perplexed as to what is happening.

I am using MPLAB IDE v8.92 programming in assembler and also have just invested in a PicKit3 programmer after tests with PicKit2 proved unsuccessful as well but still the issues persist. Incidentally the PicKit3 has Firmware Version 01.28.90, Algorithm Version 01.15.19 and OS Version 01.23.02.

I am new to the PIC24 series so have done quite a bit of on-line searching for example assembler code that I could adapt for my tests and after some time found something that worked. I managed to get some configuration settings and managed to successfully compile and download a test program to the device. On this matter I found it hard to acquire concise information on what terminology to use for the configuration of the bits in assembler so would appreciate being pointed in the right direction please.

The test program basically just turned one output on and off cyclically and although this seemed to work ok that frequency seemed very low at around 500 kHz. I am relying on the internal 8 MHz clock but despite that I expected a significantly faster output frequency.

As I wasn't completely sure on the terminology of the config bits in the program, I manually altered the settings in the Configuration Bits section in MPLAB (and commented them out in the program) in the hope that it was something awry with the oscillator settings and after that started to experience some very strange results, namely, when downloading a program I kept getting a “Target Device ID (00000000) does not match expected Device ID (10190000)”! I tried this several times but with similar results and now I am convinced that my 3rdPIC24 device has gone to silicon heaven!

I cannot erase or program the device but it appears to read back ok. I have noticed that the MPLAB configuration settings, once the device has been read, change to strange settings that I don’t remember selecting and wonder if the device is indeed being read back or if it is just reading junk! When checking if the device is blank I get the message “The following memory regions failed blank check: Program Memory Address: 00000000 Expected Value: 00ffffff Received Value: 00000000
Blank check failed.

So, I am not sure what I am doing wrong or if I have indeed cooked these PIC24 devices. I also am not sure if there are issues with PicKit3 or with MPLAB that could be causing these problems. I should add that the PIC’s are soldered onto a PCB and have 0.1uF decoupling capacitors. The MLCR pin is tied high via a 11K resistor and pin 56 (Vcap) has a 10uF tantalum capacitor. All Vss pins go to ground and all Vdd pins go to 3.3vdc supply from a good quality bench PSU. I can supply more information on this if required and also have screen shots of MPLAB config bits before and after reading the device in case it helps.

I don’t really want to cook any more PIC24 devices until I can find out what or if I am doing something wrong so would greatly appreciate your help with this. Lastly I should point out that I have programmed many PIC16 and PIC18 family devices with the same software, albeit with the PicKit2 programmer with zero issues or failures.

Regards

UPDATE >>> RESOLVED

Thanks very much DarioG and btbass for all your help, I have found the problem. The ENVREG input pin was floating and once connected to the +3.3V supply the programmer was able to see the device once again and I was able to read, erase and reprogram the PIC good as gold.

I tried several times to reply to your last posts but for some strange reason the site won't let me do that! Most bazaar.

Regards