Hi,
I have fixed one wrong wire on the EVM adapter (and some changes to the Device Tree) and
now all power switches and regulators are enabled, and the modem responds to commands :)
The setup with EVM is as follows:
* the Dummy/Adapter CPU board simply feeds the D-/D+ lines of the Modem to the OTG port
on the main board
* A standard micro-USB cable connects the OTG port to one of the two EVM USB host sockets
(or some external PC)
* rfkill unblock wwan ignites the modem (using a special kernel driver from the gta04)
The modem enumerates on USB and creates 4 serial devices:
/dev/ttyACM0..3
It is sufficient to use some terminal program to access one of them.
ati
Cinterion
PLS8-E
REVISION 01.429
OK
at+cmee=2
OK
at+cpin?
+CME ERROR: SIM failure
at+clip=1
+CME ERROR: SIM PIN required
at+cr=1
+CME ERROR: SIM PIN required
at+crc=1
+CME ERROR: SIM PIN required
at+csq
+CME ERROR: SIM PIN required
at^smoni
^SMONI: 3G,10663,346,-2.5,-78,262,03,9E65,9F5EBE5,31,37,--,LIMSRV
OK
at^smonp
3G:
10663,346,-3.0,-77,30,38
10663,315,-24.0,-121,0,0
2G:
981,--,--,--,--
616,--,--,--,--
998,--,--,--,--
626,--,--,--,--
980,--,--,--,--
811,--,--,--,--
OK
The SMONI/SMONP commands show that it already appears to be receiving something.
The figures should encode signal strength etc.
But since I have not installed a SIM card, there is no connection possible of course and
I am not sure if real network access works (the whole setup is powered through the EVM
and the wires might be too thin for GSM transmission).
This will be better as soon as the battery works, but I am still wrestling with the charger
chip to enable energy flow from the battery to the system…
BR,
Nikolaus