Doug Brown
667c2c5a2d
Added verify during write. It seems to mostly work except when the chip
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is completely removed from the SIMM -- in that case, the verification
still passes for some reason. I'm still debugging this one. Maybe the
data I had just written is still essentially on the bus because of the
floating pins and it reads it too fast? Maybe turning on pull-ups would
help with that?
2012-09-30 14:41:22 -07:00
Doug Brown
7acb3ffcc3
Added support for (untested yet) 8 MB ROM SIMM with chips that expect a
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slightly different programming protocol.
2012-09-02 15:56:49 -07:00
Doug Brown
145487d388
Added GPL header to all of my source files.
2012-05-25 20:21:04 -07:00
Doug Brown
d0b50e15c9
Removed old dead code from external_mem.c
2012-05-13 17:06:57 -07:00
Doug Brown
540e04331a
Fixed the ordering of the chips -- I had the bytes reversed. Now, when I write/read a continuous stream of data, the bytes will correspond with the correct chips.
2011-12-17 11:18:56 -08:00
Doug Brown
4f0d1a894c
Optimized some of my routines and fixed a nasty, nasty bug that was causing the board to crash because of multiple things being outputs simultaneously.
2011-12-13 21:56:20 -08:00
Doug Brown
4adb0c4980
Started working on more optimizations, but something weird is happening and it's crashing...not sure why yet.
2011-12-11 21:48:26 -08:00
Doug Brown
1c07518ab0
Added electrical test option to my temporary command line.
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Also experimented with skipping the SPI -- I left my test code in there, commented out, in case I want to do some more speed testing.
2011-12-11 15:52:04 -08:00
Doug Brown
7099218bf1
Added some optimization to remove the 1us delay on the write pulse, but I'm not sure that it matters much.
2011-12-11 13:45:17 -08:00
Doug Brown
b4eb6c3ddc
Started getting writing working, as well as the ability to restrict to a specific set of chips to write to
2011-12-11 13:28:32 -08:00
Doug Brown
e0977a9339
Created read and write cycle functions, along with a block read function. I think this will look better...
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I also changed the port module so it doesn't needlessly update the data direction register over SPI if it's being told to set the same value it had before.
2011-12-11 10:12:22 -08:00
Doug Brown
8865d0c00f
I got the device identification working, and I'm in the middle of breaking it into its own set of functions for write cycles, read cycles, unlock sequence, etc.
2011-12-10 18:40:30 -08:00
Doug Brown
1540bcadd1
Tested reading the entire SIMM contents back to the computer (it works)
2011-12-10 13:53:43 -08:00
Doug Brown
7db22e08af
Fixed a few stupid bugs -- it's now reading data correctly.
2011-12-10 13:02:21 -08:00
Doug Brown
2bc61f41aa
Continued playing with USB serial stuff. I think it's working well now, but I'm running into problems reading from the SIMM, so I need to figure out why I'm not getting the data I expect.
2011-12-10 10:35:41 -08:00
Doug Brown
06a667d66d
Fixed an inaccurate comment.
2011-11-27 23:06:02 -08:00
Doug Brown
0a52df645a
- Fixed stupid bug of -1 instead of +1 in external_mem.c.
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- Began writing an electrical test so I remember WTF I'm doing later
2011-11-27 00:09:29 -08:00
Doug Brown
1595c69890
OK -- so I separated the actual port code from the external memory controller code. I think this makes more sense.
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It does add some complexity to the code. I may be going through a chain of calls just to turn the CS pin on, for instance. Hopefully I'm not going too crazy with this.
Anyway, this means that I can control the ports from a SIMM electrical test routine using the same types of functions that the actual programming controlling code would use, without having to duplicate a bunch of port definitions and bit manipulation. I made sure to add all the functions I can think of needing to the ports module. We'll see if I got them all!
2011-11-27 00:01:29 -08:00
Doug Brown
34438a898e
Oops -- I had assert and deassert backwards.
2011-11-25 23:12:58 -08:00
Doug Brown
407f6831a9
Initial import of my test code for the SIMM programmer board. Right now
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it contains an (untested) MCP23S17 driver complete with AVR SPI support,
and an (untested) external memory interface driver that uses it.
2011-11-25 23:10:30 -08:00
