Products > Test Equipment
MSO2000 Application module hack
Lunasix:
When I bought my scope (MSO2024), the software version was very old (2009 I think) and I've installed the v1.56 PP3 17-Jul-14 11:00 firmware.
It is very difficult to remove the original Tektronix key I have (RS232), the new one is a bit smaller and very easy to remove thanks to the hole in the plastic support.
Recently, I have had a problem : sometimes, the scope was displaying a warning "Not allowed to remove key during working, please reboot" (or something like that) and I was obliged to reboot the scope, and finally, the key was not working any more. A bad solder of a wire (SCL, not realy soldered, in place thanks to solder flux) was the source of the problem, now all is fine.
I have programmed the eeprom with a board I have (PIC32), with a modified program, but I've seen that it was possible with MPLab.
Eeprom is CAT24C08C4ATR, without write protect pin, but I've tested with Atmel 24C08, and the write protect pin was tied to VSS
I've connected a Saleae analyzer with I2C protocol and nothing noticed like write attempt. It's only reading : if eeprom acknowledges readings, the scope has found a key. If the string is a valid one, it's ok, if not (like empty eeprom, all 0xff), it says it has found a key, and it asks for an update frmware as it can't use the unknown key. If you see nothing of that, you can be sure that the eeprom doesn't respond. First, try with an empty eeprom. If you see what I've described, try to programm it, if not, understand why.
drsurfer:
Thanks Lunasix.
I never saw any message from the scope.
My eeprom is programmed with all 0xFF but the null terminated strings at 0x004 and 0x204.
According to your notes, if it was wrong I should see a specific message from the scope, but this didn't happen.
My PCB is simply put in place with a cardboard . As far I can see, there isn't any "module presence switch", am I right?
At this point I would feel more relaxed if I could try the slot with an original module, but I don't know anyone can borrow it near to me.
Ciao
DrSurfer
Lunasix:
It's I2C : if circuit is present at right address, it responds. With a scope, it will not be obvious as there are other components on the bus, and eeprom access is not at the beginning. You should connect 4 wires (VSS, VDD, SCL and SDA) going out of the scope and verifiy that all are correct, before attempting to connect the eeprom.
drsurfer:
Ok, ;D finally it worked!!!! :-+
It was simply a mechanical issue: I just filed the PCB to allow it to enter more deeply into the slot.
I did it because looking at your photos, I had the feeling that on my device the distance between the contacts and the board edge was larger.
Just to be sure and build a finally reliable device, could you kindly provide me some actual measurements of your module? I need the outside dimensions of the module and the distances of the contacts from the edges. I refer to "contacts" because I have a different type of SIM card connector (see Relu's post).
Thanks for your support and patience!
Lunasix:
Size of a key : 33.4 x 10.4 x 4.4mm (lightly smaller than the original, and without retaining slot, as the original is very hard to extract).
Center of sim connector is at 11.95mm from left side of key and on center in vertical direction.
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