Helping the original parallax oscilloscope log data and more
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I have better equipment now but this was my first and cheapest data capturing scope.
I have the original usb oscilliscope from parallax and was attempting to do some logic decoding however I could not press print screen fast enough or even enough times to capture a complete message.
I knew the scope had a usb to serial chip so I thought I could intercept the messages and build my own graph with a complete start to finish picture.
I can't use PortMon on Windows7... I'm forced back to original software that cant log worth anything...
It's been 7 years and I am having trouble locating the source code. I found the install package and will get it uploaded first while I continue searching for the original code. If not I hope I didn't obfuscate and can reverse easily.
New Logic program that logs ALL data from scope output with PORTMON
THESE ARE NOT THE SAME OUTPUTS, JUST SOMETHING TO COMPARE VOLT/LOGIC
Partial view from Parallax scope app
Made a couple of basic parameters for the app named, Input Voltage Low (Vil) , Input Voltage High (Vih) , and finally Input Voltage (Vcc) variables. If the 30/70% of Vdd rule is exceeed the value is changed to a 1 or 0 giving a stepped logical view instead of scope type of view with little voltage spikes and dips.
Here is a SS of the hex --> voltage chart. Simple pattern after the first .07. It is (5) .08 tehn a .07, all the way to the end.
I am in the processing of putting togethor a simple VB.NET with zedgraph component
to read the output from PORTMON and plot it on a graph and if time
permits ultimatly automaticall decipher the I2C messages.
App
will be able to read the PORTMON data log file, look for the pattern of
55, data1, data2, AA and if all is valid (not more than 2 data sequences
between the 55 and AA) output the data to a graph. The output captured
from the scope is 50uS at 5V for both channels. Will also prob add in a
logic mode that will use a couple of params at first to determine what
is considered "HI" and "LOW" so it's not a voltage reference chart.
Well Portmon
was able to capture all the messages sent/received to the oscilloscope,
looks like data is sent. I setup a filter to include only IRP_MJ_READ
and IRP_MJ_WRITE message types only. Here are the "good" messages that
need to be deciphered or at least understood as a pattern.
******** SEND DATA REQUEST START ******
IRP_MJ_WRITE Length 1: AA
IRP_MJ_WRITE Length 1: 52
IRP_MJ_WRITE Length 1: F3
IRP_MJ_WRITE Length 1: 14
IRP_MJ_WRITE Length 1: 00
IRP_MJ_WRITE Length 1: 91
IRP_MJ_WRITE Length 1: 07
IRP_MJ_WRITE Length 1: 2D
IRP_MJ_WRITE Length 1: 05
******** SEND DATA REQUEST DONE ******
******** RECV ???ACCEPTED CMD??? ******
IRP_MJ_READ Length 1: 55
******** RECV DATA FROM SCOPE START ******
IRP_MJ_READ Length 1500: 7E 7E 7E 7E 7E 7E 7E 7E 7E .... (ch1 data)
IRP_MJ_READ Length 1500: 7E 7E 7D 7E 7E 7E 7E 7F 7E ....(ch2 data)
******** RECV DATA FROM SCOPE END ******
Above sequence loops until "STOP" button is pressed which shows up as a
IRP_MJ_WRITE Length 1: FF
Will decypher the data section tomorrow and post an excel file of results.
Well the oscilloscope does not do any data logging and only captures what is on the screen. Not being able to log data is real limitation. I see the data flash on the screen but can not capture the entire data steam as an image or as a saved data file. Since it's USB probably has some USB --> Serial chip inside. Time to see what can be done to fix my needs w/o buying another scope.
BDM
sheikh
Justin R.
George Gardner
Rowanon