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Problem in GPIO output | Telit Cinterion IoT Developer Community

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pfniyigena's picture
pfniyigena

May 10, 2016 - 3:25pm, 2838 views

Hi,

We have a Gemalto EHS6T connected in the following way:

- AREF connected to the +5V output (also tried connecting it to a 3.3V power source)

- GPIO20 connected to GPIO21

- GPIO12 connected to GPIO13

We are running the example program from the CD called GPIO5V_lib with the pins GPIO20 and GPIO21 as output/input or GPIO12 and GPIO13. Anyway, the result is the same: Output says it changes to 0 and 1 and 0 and 1 but the input stays all the time to 0. If we put the input to 5V or ground we see it changes, but whatever the output is, we always get 0.

We even tried doing a factory reset to the Gemalto with no changes from this behaviour.

Can anyone help us so we can set the output to 1 or to 0 and see it in the respective pin of the device?

Thanks,

Peter

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Jure's picture
Jure
May 10 2016 - 3:45pm

This is qoute from some other similiar topic:

If you are using the terminal the module's GPIO lines are connected to the level shifters in terminal. So you need to configure these level shifters as input or output according to the hardware description document for terminal. Have you done this? After this is done you can configure and drive the pins with AT commands.

Regards.

Jure

antero.markkula@enkom.fi's picture
antero.markkula...
May 11 2016 - 8:27am

Hi,
Jure may refer to this: https://iot-developer.thalesgroup.com/threads/program-sspi-configuration...
This link includes a link to a .jar application to configure some of the I/O's graphically.
I have tested it and it works fine.

In the EHS6T hardware manual, there is a section "Set GPIO Direction" which gives information how to configure the GPIO level shifters.

Below is an example of my configuration for a customer for EHS6T USB 03.001 A-rev 14:

AT^SSPI=
"CONNECT")
'<aD41001>
(will say "{a+}")

Antero Markkula
Communication and Mechatronics

Enkom Active Oy – www.enkom-active.fi
Upseerinkatu 3 A, 02600 Espoo, Finland
Mobile: +358 400 411368
Office: +358 10 204 0000
Fax: +358 10 204 0010
E-mail: antero.markkula@enkom-active.fi

mullengers's picture
mullengers
Dec 6 2016 - 12:05pm

Please have a look at this artice where we set the input and output for both Terminals and the EHS6 Concept board using I2C to control the level shifter chips:

https://iot-developer.thalesgroup.com/tutorial/conceptboard-java-gpio-lib