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Re: [ts-7000] RS485 HD on TS7390

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Subject: Re: [ts-7000] RS485 HD on TS7390
From: Petr Štetiar <>
Date: Fri, 14 Sep 2012 08:09:31 +0200
briandgallaway <> [2012-09-13 18:00:02]:

> So now it looks like I'll need to write to the registers using mmap.
> However, I do not know which address to write to for the TS7390.  I've seen
> posts doing similar for the TS7260 and TS7800, but nothing for the TS73xx
> series.

>From the docs:

        Appendix C: TS-7390 FGPA Register Map

        By default the Lattice FPGA on the TS-7390 is loaded with a system 
controller
        core at base physical address 0x600F_F080. Add that base to the offsets 
below
        to access these registers. These registers are all 16 bits wide and 
should
        therefore be accessed with 16 bit writes.

           base + 0x06:
              bit 06: 485 Full Duplex Control

So just modify that many mmap bit fiddling examples you can find around and
you're probably done.

-- ynezz


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