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Commit Graph

5 Commits

Author SHA1 Message Date
Werner Almesberger
6d4ea61ae1 More detailed examination of the input circuit problem.
- cntr/README, ecn/INDEX, ecn/ecn0006.txt: moved discussion of the input
  circuit from README to ECN0006
- cntr/cntr.sch: changed pointer from README to ECN0006
- ecn/ecn0006.txt: added more measurements, explanations, and an analysis
  of the situation
2010-11-05 14:45:12 -03:00
Werner Almesberger
43f0bcee36 cntr/README: cntr -r always returns an error, so we cannot use it with && 2010-11-04 22:40:50 -03:00
Werner Almesberger
8cb17bb1b3 Document that the input circuit does not reach the design frequency (3 MHz) yet.
- cntr/cntr.sch: added warning that input circuit isn't good enough yet
- cntr/README: document input circuit problem, with measurement results
2010-11-04 22:33:04 -03:00
Werner Almesberger
c91658e1ed cntr/README update: name clarification and bugs list.
- cntr/README: change the name from "Arbitrary-precision counter" to
  "Arbitrary-precision frequency counter"
- cntr/README: added list of known hardware issues
2010-11-03 10:30:34 -03:00
Werner Almesberger
c7303e4ac1 Made communication with CNTR board more robust. Added documentation.
- cntr/README: description of the counter board and its application
- cntr/fw/common/crc32.c: variant of CRC32-IEEE802.3 shared by firmware and
  measurement application
- cntr/fw/cntr/ep0.c (my_setup), cntr/tools/cntr/cntr.c (get_sample):
  protect the counter value with a CRC and an one's complement copy
- cntr/fw/include/cntr/ep0.h: oops, wasn't checked into repository
- cntr/tools/cntr/cntr.c: added section titles
- cntr/tools/cntr/cntr.c (measure): show communication statistics at the end
- cntr/tools/cntr/cntr.c (measure, usage, main): new option -d to enable
  reporting of communication errors
- cntr/tools/cntr/cntr.c (set_stop, measure): let user stop measurement with
  SIGINT
- cntr/tools/cntr/cntr.c (measure): get multiple "first samples" and keep
  the one with the shortest round-trip time
- cntr/tools/cntr/cntr.c (measure): changed unit "ppk" (1/1000) to percent
  (1/100)
- cntr/tools/cntr/cntr.c (usage, main): command-line argument is now the
  accuracy goal, while the system clock deviation is set with the new
  option -c
- TODO: some more things to do
2010-08-25 18:47:45 -03:00