4,199
edits
Changes
m
$ <pre>echo 0 > /sys/class/gpio/gpio145/value $ echo 1 > /sys/class/gpio/gpio163/value $ sleep 1 $ echo 0 > /sys/class/gpio/gpio163/value</pre>
→How to Telit Modem
*Power up the modem using the next commands:
*Once the modem is on (led near power button is blinking now), you can interact with it via UART 2.
A detailed guide on how use wifi can be found by following this link: [[Using USB ethernet gadget to communicate]]
== How to read analog values (ADC) ==
IGEP BERLIN provides 2 analog inputs on J1206: Maximum allowed analog voltage is 1V8.
[[Image:BASE_BERLIN_CONNECTORS.png|right|300px]]
To protect the ADC input for higher voltages than 1V8, exist a diode protection (Z300). See diagram on the right side.
[[Image:BERLIN_ADC_SCHEMA.png|right|300px]]
To prove the lectures, you have examples codes written in phyton in the ISEE GIT.
[http://git.isee.biz/?p=pub/scm/igep_qa.git;a=blob_plain;f=igep_qa/helpers/madc.py;hb=HEAD Downlaod Python example]
[http://git.isee.biz/?p=pub/scm/igep_qa.git;a=tree;f=igep_qa/helpers;h=e0671966af9f539bdd7628e101c181d8e74dc506;hb=HEAD ->Link to GIT directory]
To read the ADC2 or ADC3 you have to modify one line of code at end of document for the channel 2 or 3.
madc = QMadc(2) or madc = QMadc(3)
You have another example written in c.
[[File:BERLIN_ADC.tar.gz]]
Warning: There is a small deviation in reading values near to 1V8 due to this protection.
The TPS65950 datasheet describes chip can support up to 2.5V at the ADC input .
Datasheet: http://www.ti.com/lit/ds/symlink/tps65950.pdf
Under his responsibility can desolder for more accurate readings.
== How to operate USER LED's ==
On BASE0010 the two leds are available via gpio 19 and 22. See the example below:
=== For D103 LED USER1(GPIO22): ===
We publish the virtual file system to configure elements of the chip via the Linux kernel
mount -t debugfs none /sys/kernel/debug/omap_mux
Set the pin as function gpio22
echo 0x104 > /sys/kernel/debug/omap_mux/etk_d8
Do gpio22 accessible
echo 22 > /sys/class/gpio/export
Configure the pin as output
echo out > /sys/class/gpio/gpio22/direction
LED ON: echo 1 > /sys/class/gpio/gpio22/value
LED OFF:echo 0 > /sys/class/gpio/gpio22/value
=== For D103 LED USER2 (GPIO19): ===
echo 19 > /sys/class/gpio/export
echo out>/sys/class/gpio/gpio19/direction
LED ON: echo 1 > /sys/class/gpio/gpio19/value
LED OFF:echo 0 > /sys/class/gpio/gpio19/value
{{Template:Navigation/IGEP Technology Guides/What can I do/Ending}}
[[Category:IGEP Technology Devices Guides]]