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SPI transmission fails | Thales IoT Developer Community

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tarp335's picture
tarp335

November 3, 2015 - 10:04am, 1483 views

Hello Gemalto,

im strugling with my SPI connection. As described in concept_board_HardwareInterfaceDescription_v01a i have on the right switch bank configured the switches 

1: "on"
2: "on"
3: "off"
4: "on"

ive changed my SPI settings to "std" and my SCFG looks like this:

^SCFG: "Call/ECC","0"<CR><LF>
^SCFG: "GPRS/AutoAttach","enabled"<CR><LF>
^SCFG: "Gpio/****/ASC1","rsv"<CR><LF>
^SCFG: "Gpio/****/DAI","gpio"<CR><LF>
^SCFG: "Gpio/****/DCD0","std"<CR><LF>
^SCFG: "Gpio/****/DSR0","rsv"<CR><LF>
^SCFG: "Gpio/****/DTR0","std"<CR><LF>
^SCFG: "Gpio/****/FSR","gpio"<CR><LF>
^SCFG: "Gpio/****/HSIC","rsv"<CR><LF>
^SCFG: "Gpio/****/PULSE","gpio"<CR><LF>
^SCFG: "Gpio/****/PWM","gpio"<CR><LF>
^SCFG: "Gpio/****/RING0","std"<CR><LF>
^SCFG: "Gpio/****/SPI","std"<CR><LF>
^SCFG: "Gpio/****/SYNC","gpio"<CR><LF>
^SCFG: "Ident/Manufacturer","Cinterion"<CR><LF>
^SCFG: "Ident/Product","EHS6"<CR><LF>
^SCFG: "MEShutdown/Fso","0"<CR><LF>
^SCFG: "MEopMode/SoR","off"<CR><LF>
^SCFG: "Radio/Band","511"<CR><LF>
^SCFG: "Radio/OutputPowerReduction","4"<CR><LF>
^SCFG: "Serial/Interface/Allocation","1","1"<CR><LF>
^SCFG: "Serial/USB/DDD","0","0","0409","1E2D","0058","Cinterion Wireless Modules","EHx",""<CR><LF>
^SCFG: "Tcp/IRT","3"<CR><LF>
^SCFG: "Tcp/MR","10"<CR><LF>
^SCFG: "Tcp/OT","6000"<CR><LF>
^SCFG: "Tcp/WithURCs","on"<CR><LF>
^SCFG: "Trace/Syslog/Otap","0"<CR><LF>
^SCFG: "URC/Ringline","local"<CR><LF>
^SCFG: "URC/Ringline/ActiveTime","2"<CR><LF>
^SCFG: "Userware/Autostart","1"<CR><LF>
^SCFG: "Userware/Autostart/Delay","0"<CR><LF>
^SCFG: "Userware/DebugInterface","0.0.0.0","0.0.0.0","0"<CR><LF>
^SCFG: "Userware/DebugMode","on"<CR><LF>
^SCFG: "Userware/Passwd",<CR><LF>
^SCFG: "Userware/Stdout","null",,,,"off"<CR><LF>
^SCFG: "Userware/Watchdog","0"<CR><LF>

Now when i restart my concept board the SCK and MOSI diodes are turned on.

Using an osciloscope i see that SCK goes low when i send data, and goes high when i close. But my CS and MOSI stays high the entire time?

When the program has terminated the SCK,MOSI and CS diodes are turned on.

my application looks like this:

i have made some code that reads the input buffer and it seems there is something wrong with my protocol.
The buffer contains {2!0003} and the exclamation mark means that there is a protocol error?

I haven't connected a SPI device yet, so could that be the problem?

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Bartłomiej Gemalto Moderator's picture
Bartłomiej Gema...
Nov 4 2015 - 4:01pm

Hello,

The switches seem to be OK. Alternatively you can use i2c configuration instead of the switches as described in the hardware description for the concept board. 

Another important thing is that some of the module's lines are common for more than one interface. SPI has some common lines with ASC0 and ASC1 interfaces. To use SPI some configuration ***** to be done first with AT^SCFG command. This is described in the AT commands specification document. For SPI this setting should be made: AT^SCFG="GPIO/****/SPI","std".

To test SPI communication you should have some SPI device.

But without the device if you send ID and address only without the data you should get {ID + } response because in that case only the syntax is validated and data is not sent.

Have you tried the same with AT commands without Java for comparison?

Regards,

Bartłomiej