Hi,
1st before anything else... Is there a reasonable way to search the
mspgcc-users archive?
I've poked around a bit and doesn't seem to be.
I'm playing with the dma engines on the msp430f2617. I've written a unified
driver that
handles all three main processor varients. (x1: msp430f1611, x2:
msp430f2617, and x5:
cc430f5137, msp430f5438). Am currently testing on the 2617.
Currently using the old z1 varient of mspgcc 3.2.3 and am trying to figure
out how one
goes about messing with the 20 bit DMA0SA periphreg and its friends.
On the 2617, the DMA registers are in the 0x1xx 16 bit i/o register space
which behaves
strangely. That is it seems that one must reference it with 16 bit
instructions (mov
vs. mov.b) and addresses have to be short aligned.
I'm trying to figure out how to set the upper 4 bits. The registers are
laid out as a 32 bit
long word. When I reference the register as a ulong the code generated is
two 16 bit
mov's. The first writes the low order 16 (which clears the upper as it
should and as
documented). The second does nothing. These are normal mov's.
I'm thinking that I need to use mov.a or mov.x. I tried messing a little
bit with
the assembler syntax in C but didn't get very far so am asking for help with
that.
Any thoughts on the matter?
I wanted to search the archive for mov.a but that yielded nonsense.
--
Eric B. Decker
Senior (over 50 :-) Researcher
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