I have an Overo Water COM / SUMMIT expansion board I'm trying to configure.
At this time I would like help with the mux.h flags used by u-boot. I am
not an EE so I don't understand the significance of these flags related to
signal processing. I am trying to use the UART serial communications
protocols. I have built a custom u-boot image and I have verified that it
boots the Overo with the right memory location settings.
I am using the program 'sertest' and an oscilloscope to test the pins I
expect to have the signals. I am trying to use uart2 (/dev/ttyS1) which I
believe correspond to the SUMMIT SV1 pins 27 and 29. I don't see any
activity on the pins, however.
So, I was wondering if someone would be able to explain what the flags (IEN,
IDIS, PTD, PTU, DIS, EN) )in mux.h mean in a hardware signal processing
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> So, I was wondering if someone would be able to explain what the flags
> (IEN, IDIS, PTD, PTU, DIS, EN) )in mux.h mean in a hardware signal
Probably too later for your usage, but for future reference for people
finding this post doing a search. The defines affect the OMAP internal pull
resistors and decides if the input stage buffers should be active or not -
Taken from board/overo/overo.h in U-boot:
* IEN - Input Enable
* IDIS - Input Disable
* PTD - Pull type Down
* PTU - Pull type Up
* DIS - Pull type selection is inactive
* EN - Pull type selection is active
* M0 - Mode 0
* The commented string gives the final mux configuration for that pin
SSC Solutions ApS - Denmark - http://www.ssc-solutions.dk
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