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peter
peter
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I have igepv2 revision C. I have a a console running ubuntu connected to the igepv2 (via USB to DB9 connector and via IDC-10 (AT-Everex) configuration) J960 connector. I am using ttyO2 (UART3) in my igepv2 kernel and do not want to disable it!!

I think I have the following names in my kernel:
UART1: /dev/ttyO0
UART2: /dev/ttyO1
UART3: /dev/ttyO2 --- currently used and needed for my console running on Ubuntu machinge.
UART4: /dev/ttyO3 --- not sure if I have this in my kernel.


Question: Can I use UART1 as follows: .... I wire my 3.3v gps TX and RX to the igepv2 RX1 (J960 pin 8) and TX1 (J960 pin 9). Can these pins understand 3.3v signals versus RS232 signals? In other words, will the following wiring work?
J960 pin 2 --> DB9 connector to Ubuntu
J960 pin 3 --> DB9 connector to Ubuntu
J960 pin 5 --> DB9 connector to Ubuntu
J960 pin 5 --> to GNDgps (cut existing wire to DB9 connector)
J960 pin 8 --> to RXgps (cut existing wire to DB9 connector)
J960 pin 9 --> to TXgps (cut existing wire to DB9 connector)

My other alternative is to use UART2 on J990 connector. It uses 1.8v so I would have to use a zener diode for level shifting. Also, I would have to disable bluetooth and reset the omap modes in the kernel sources file board-igep0020 for J990 pins 6 and 8 (as shown in the how-to How to set up UART2 in J990. My preference is to use UART1

Accepted Answer

Wednesday, February 26 2014, 09:21 AM - #permalink
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Hi,

Both UARTs in J960 output with RS232 levels, so you can't connect 3.3v signal. If you use the J990 you just need to place a level translator from 1.8V to 3.3V

Note that you can download the schematics from our website.

Hope it helps you.
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