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  • dso_15001k
Related

Is This Situation Repairable

jw0752
jw0752 over 8 years ago

A while back I posted a blog about building a DSO Shell 15001K Oscilloscope Kit.

 

https://www.element14.com/community/people/jw0752/blog/2017/04/25/building-the-dso-shell-15001k-oscilloscope

 

I gave one of these kits to an old friend and he called me a few days later to say that the preliminary test of the Main Board which is done before one starts assembly showed it to be failed We tried a number of diagnostics over the phone and finally I had him send the board to me My tests revealed that there was a low resistance short on the 3.3 volt rail I traced the circuit and removed smd components and cut traces to try to isolate the branch of the 3.3 volt circuit and the component that might be causing the problem Ultimately the fault was in the  STM32F103C8T6STM32F103C8T6 microprocessor I removed the microprocessor and decided that the unit was going to be just parts While I can technically replace the uP I have no way to reprogram it As I studied the schematic I noticed that there was in addition to the uP an 8 pin 24LC32A EPROM tied to the SOA and SCL pins of the uP Here is a link to the main board schematic

 

http://www.jyetech.com/Products/LcdScope/Schematic_150main.pdf

 

My question is whether there is a possibility that the program for the unit is on the EPROM and not on the uP. Would I be able to replace the fried uP with a raw one and expect it to automatically boot up from the EPROM.  At this point it is all just a learning experience but I will probably not waste my money on a uP or my time replacing it if it is impossible for the program to be on the EPROM.

 

Any insights will be appreciated.

 

John

 

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  • jw0752
    jw0752 over 8 years ago +8 suggested
    Hi mcb1 Jan Cumps , , gecoz , I want to thank each of you for your awesome response to my question. Based on what you have told me I am sure it will not be as easy as just replacing the uP but your insights…
  • jw0752
    jw0752 over 8 years ago +7
    This is just an update. The STM 32 microprocessor arrived today and I installed it on the board as well as all the parts I had removed to trace the original short. The chip comes with a pre-installed bootloader…
  • mcb1
    mcb1 over 8 years ago +5 suggested
    Does it still have the short. These EEprom do have a supply, and it would be very close to the uP, so it's possible. They usually are a memory for the processor. It will contain some data that is read…
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  • jw0752
    0 jw0752 over 8 years ago

    This is just an update. The STM 32 microprocessor arrived today and I installed it on the board as well as all the parts I had removed to trace the original short. The chip comes with a pre-installed bootloader. I down loaded an updated firmware from JYE and then I started searching the web for how to upgrade firmware. After a bit (about 2 hours ) of searching and down loading I had my USB UART atached to the computer with the proper driver. I had a USB Flash program from STM up and running and thanks to a you-tube video I knew what to do on the Flash Program to get it to work. To my amazement it all worked as it should and I was able to boot the board to a normal screen.

     

    image

     

    image

     

    Thank you for all your suggestions and encouragement.  This was a lot of fun.

     

    John

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  • Jan Cumps
    0 Jan Cumps over 8 years ago in reply to jw0752

    Which USB to UART did you end up using, John?

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  • jw0752
    0 jw0752 over 8 years ago in reply to Jan Cumps

    Hi Jan,

     

    As I was searching the internet for the shortest easier solution last night I remembered that I had a UART that I used a couple years ago to program an Arduino Mini Pro. Here are pictures of it:

     

    image

    image

    image

     

    As you can see it is just like the one you recommended without the cord. It is based on the Silabs CP2102.

     

    NOTE: I have need of a clarification:

     

    As long as we are talking I have a clarification question on these UARTs. Most of them have a way of choosing 5V or 3.3V. I am assuming that this is strictly for supplying power to the unit that is being programmed and has nothing to do with logic levels that the UART supplies. This one has 3.3V logic levels and it worked well with my 3.3 V STM 32 microprocessor. If however I was trying to use it on a chip that used 5V logic levels I might have a problem and would have to use a 3.3V to 5V logic converter. I have written this as statements but I need reassurance that I have the right idea about what I have said.

     

    Thanks

    John

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  • jw0752
    0 jw0752 over 8 years ago in reply to Jan Cumps

    Hi Jan,

     

    As I was searching the internet for the shortest easier solution last night I remembered that I had a UART that I used a couple years ago to program an Arduino Mini Pro. Here are pictures of it:

     

    image

    image

    image

     

    As you can see it is just like the one you recommended without the cord. It is based on the Silabs CP2102.

     

    NOTE: I have need of a clarification:

     

    As long as we are talking I have a clarification question on these UARTs. Most of them have a way of choosing 5V or 3.3V. I am assuming that this is strictly for supplying power to the unit that is being programmed and has nothing to do with logic levels that the UART supplies. This one has 3.3V logic levels and it worked well with my 3.3 V STM 32 microprocessor. If however I was trying to use it on a chip that used 5V logic levels I might have a problem and would have to use a 3.3V to 5V logic converter. I have written this as statements but I need reassurance that I have the right idea about what I have said.

     

    Thanks

    John

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  • gecoz
    0 gecoz over 8 years ago in reply to jw0752

    Hi John,

    Your statement is absolutely right. UART devices can use different voltages for their logic levels, while still implementing the same communication protocol. In your case, the logic levels of the STM32 UART are 0V low, 3.3V high, so your USB to UART converter was OK. But if you were to use it to interface USB with a TTL UART  device (like the Arduino UNO UART for instance), you would have needed a logic level converter, as TTL logic works with 0V low and 5V high levels.

    Fabio.

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  • jw0752
    0 jw0752 over 8 years ago in reply to gecoz

    Thanks Fabio for the assurance. I want to understand things from the foundations but often the foundations are trivial, assumed and not properly covered.

    John

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