1 Dec
2011
1 Dec
'11
7:38 p.m.
On Dec 1, 2011, at 9:41 PM, Jim Brain wrote:
I was going to reply only off list, but the lemmings
are all responding here, so I will as well (and I'll send a personal email to boot).
I guess I didn't realize that's what he meant. Oh well. Good discussion is good.
:-)
I have working SD routines, and a nice uC option
(ST32F4 series), but was stuck at the SCSI interface layer.
The F4 series is nice. One of my pet project desires is one that can stream images over
NFS; you'd have to use an external PHY (TI's Stellaris series has a built-in PHY,
but it's undesirable for a number of other reasons).
I was hoping to sidestep the need for an FPGA, just
because they can inflate the cost of a project quite a bit.
And they're not strictly necessary. I would be interested in that aspect because it
allows for a lot of hardware offload, but since a Cortex-M4 is quite a beast, it's
probably not a big deal. ST has a nice DMA engine in their F2/F4 series, too.
The FPGA doesn't help at the physical layer; they're all 3.3v and down these days.
Finding an external transceiver that is still cheaply produced in volume is the
challenge.
In any event, I am extremely interested in this. I
have SD code, FAT12/16/32 LFN code, and code to handle some image formats, though more
code is no doubt needed.
Always useful.
- Dave