Hi!
I have built 2 units of simtrace hardware recently. All the components came from digikey, I used the bom list from git. The PCBs are electrically tested.
When I connected it to the pc, simtrace application can communicate with the device and I can debug it via the FTDI connection. The problem is, when I connect it to a cellphone, cellphone can not detect a sim card. Simtrace can detect vcc on, vcc off and rst signals from the cellphone however, cellphone can not detect the sim card. I used several different cell phones and sim cards. I also checked the connection between the cellhpone and simtrace. Couldn't find a problem.
May I kindly request your help to solve the problem?
Thanks,
Tali Budur wrote:
May I kindly request your help to solve the problem?
How could anyone help you when you haven't provided any information about what actually fails?
"can't detect sim card" is not a useful error report, it merely describes a symptom. From that it is impossible to say what your problem is.
Use an oscilloscope or logic analyzer to investigate various points on the PCB.
Use debugging statements inside the firmware to investigate what is going on in the firmware.
Provide the mailing list with detailed information about what actually goes wrong. You have to do that investigation yourself. Only then can you actually get some help.
//Peter
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Peter Stuge -
Tali Budur