LED output on MC8704


#1

Hi, all

How does one turn LED output on? MC8704 card is in use.
AT!LEDCTRL command shows me default pattern, but it is not being displayed.
AT command manual also mentions AT+WHCNF command to turn LED output on, but it is not applicable to MDM8200 chipset in MC8704 and this command simply fails.

Thanks,
Rudolf


#2

Hi Rudolf,

What FW you are using and how you check the LED signal?
Are you testing with SierraWireless MC dev.kit or you test with your PCB?

I tested with SWI MC devboard, 1400338 Rev 2, I am able to see the changes in LED_GRN with varies network state.

And you are right, +WHCNF is not supported on MC870x and only required !LEDCTRL. Below my setting with FW T3.0.3.0.
0:0,0,0
1:52,50,0
2:0,16,0
3:5,4,0
4:20,10,0
5:5,4,0

Hope it helps.
Thx


#3

firmware T2_0_2_1AP

Modem runs on ALIX6F2 board from PC Engines
From schematics, i can see that right connections are made for LED to work.

I will try to upgrade f/w and see if anything changes.

Rudolf


#4

Same with latest f/w.

Digging through our board schematics, LED is connected to pin 42 of cPCI-E connector (WWAN_LED)
Which pin is MC8704 driving LED on?

Thanks,
Rudolf


#5

Solved!

Schematics did not quite matched the board. In particular one of the resistors was not loaded, so output of MC8704 was not connected to LED driver. Fixed it with soldering iron and all is good now.

Thank for your help.

Rudolf