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TI Stellaris Oscilloscope not connecting to LM4F232 eval kit
I installed all related drivers from CD. Connected the OTG port to my computer using cable provided in kit.
Under Device Manager --> Ports (COM and LTP) , I can see "Stellaris Data Logger Serial Port (COM13)".
I run TI Stellaris Oscilloscope app and it do not detect. It just keeps saying "Searching for Oscilloscope device". and does that forever.
Any hint on the issue.
Using Windiws 7 Professional N Version 6.1 (Build 7600) 64 bit.
The TI Stellaris Oscilloscope application is a companion for the oscilloscope application that runs only on an ek-lm3s3748 board. If you don't have one of those connected and don't have the qs-scope application flashed to that board, the PC-side oscilloscope can't work since it has nothing to talk to.
For an ek-lm4f232 board, the companion application to the data logger application is called "logger.exe" and can be found in C:\StellarisWare\tools\bin.
Thanks for the help. The tools install page open from LM4F232 Eval CD actually installs TI Stellaris Oscilloscope App and creates ICON for it. SO user will naturally try to use it and have questions for not working.
I just took another look at the help file for the Stellaris Oscilloscope application and it doesn't make it clear that it should only be used with EK-LM3S3748 so I'll make sure this is updated before the next release. Sorry about that.
The USB examples package includes all the example apps that are built using Microsoft Visual Studio (and require a Windows installer) and which relate to any board. While some are supported across several boards (e.g. usb_bulk_example), others like the oscilloscope are paired with applications that only run on one evaluation kit. Any examples that we build using GCC tools (and which don't require an installer) is included in the C:\StellarisWare\tools directory. This includes the "logger" application that is used with the ek-lm4f232 qs-logger example.
I perfectly under understand and I am not expecting every thing to run out of box straight away as technology is moving so fast, it is not easy to sync with it. However TI is doing good job on E2E platform, at least I am able to come back on evaluation in just 24 hrs. That is great.
After looger.exe is working, I noticed one strange thing.
On LM4F232 board,
I connected Ch:0 to 5K Potentiometer. I used +5V (VBUS) and Gnd provided by LM4F232 kit on connector J3.
I vary my potentiometer and reading on Ch:0 changes from 0V to 5V and that is perfect, however along with it internal temperature also changes.
When Ch:0 is at 0V, temperature reads 38.6 ~ 38.9 degC.
When Ch:0 is at 5V, temperature reads 31.2 ~ 31.4 degC.
This varies linearly along with Ch:0 voltage. No change in external temperature, Acceleration and current measurement.
Internal temperature also varies with temperature change and I can see that from placing my finger over CPU.
Is there any link between Ch:0 voltage input and internal temperature?
Thank you for reporting this problem. We have already observed this and have opened an issue for it. The problem is a mismatch between input impedance of the analog input and the temperature sensor output, and so the temp sensor input is not settling fast enough before the value is sampled. Therefore the temp sensor appears to be affected by the voltage of the input that was sampled before it. We will fix it in a future release of StellarisWare. The fix will be to add additional sample slots for the temp sensor which will effectively increase the settling time.
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