mirror of
git://projects.qi-hardware.com/ben-wpan.git
synced 2024-12-23 19:04:36 +02:00
319bd8345d
- atben/TODO: changed all occurrences of "atusd" to "atben" - atben/TODO: added reminder that the file isn't current anymore - atben/Makefile (NAME): changed project name from "atusd" to "atben" - atben/atusd.brd: renamed to atben/atben.brd - atben/atusd.cmp: renamed to atben/atben.cmp - atben/atusd.pro: renamed to atben/atben.pro - atben/atusd.sch: renamed to atben/atben.sch
148 lines
4.0 KiB
Plaintext
148 lines
4.0 KiB
Plaintext
*** NEEDS UPDATING ***
|
|
|
|
General
|
|
=======
|
|
|
|
Things not done yet
|
|
-------------------
|
|
|
|
- document directory hierarchy
|
|
|
|
- make sure all files have a copyright header or are listed in AUTHORS
|
|
|
|
- connect all the bits and pieces of the build system
|
|
|
|
- combine io-parts.h generation
|
|
|
|
- combine "standard" EP0 commands, such as *_ID and *_BUILD
|
|
|
|
- implement return to DFU in application's EP0 protocol
|
|
|
|
- consider removing *_ID and using bcdDevice instead
|
|
|
|
|
|
Bugs to fix
|
|
-----------
|
|
|
|
- builds fail if .version isn't there yet
|
|
|
|
|
|
|
|
atrf
|
|
====
|
|
|
|
AT86RF230-based IEEE 802.15.4 transceiver. Two variants: one to make a USB
|
|
dongle for use with any Linux host, and one that connects with SPI directly
|
|
inside a Ben.
|
|
|
|
Update: following Rikard Lindstrom's revelation that we can use the uSD slot
|
|
also just as general GPIOs, the variant that goes inside the Ben can wait a
|
|
bit and the atben board for insertion into the uSD slot is being worked on
|
|
first. We can verify most of the design of a fully integrated board with the
|
|
atben board and the latter will be of greater immediate use.
|
|
|
|
|
|
Things done
|
|
-----------
|
|
|
|
- verify that the Ben can output an a) 16 MHz clock, and b) with +/- 40 ppm
|
|
|
|
Done, see ecn/ecn0005.txt. Works fine.
|
|
|
|
- replace discrete balun and filter with integrated solution, to reduce BOM
|
|
size, maybe cost, insertion loss, and PCB space (see ATRF/ECN0003)
|
|
|
|
Done for atben. At a first glamce, does not seem to affect performance.
|
|
|
|
- check if we really need three DC blocking caps in the RF path
|
|
|
|
Reduced to two in atben without apparent ill effects.
|
|
|
|
|
|
Things not done yet
|
|
-------------------
|
|
|
|
- examine spectrum around carrier frequency and first harmonic to look for
|
|
obvious distortions. Vary transmit power.
|
|
|
|
- measure throughput as a function of placement/distance, carrier frequency,
|
|
and transmit power
|
|
|
|
- atrf-txrx: suppport "extended mode" with IEEE 802.15.4 CSMA-CA for more
|
|
realistic throughput figures
|
|
|
|
- measure full spectrum (ideally up to 25 GHz, but just 2nd and 3rd harmonic
|
|
will already tell most of the story) with calibrated antenna for FCC/ETSI
|
|
compliance assessment. Vary transmit power.
|
|
|
|
- use IEEE 802.15.4 stack from linux-zigbee. The linux-zigbee kernel is
|
|
currently at 2.6.35. Once 2.6.36 is released, we should have Ben and
|
|
IEEE 802.15.4 support in the same kernel without further ado.
|
|
|
|
- change layout of transceiver side of the board for placement inside Ben
|
|
|
|
- define EMI filters for placement inside Ben
|
|
|
|
- check USB standard for recommended USB dongle dimensions
|
|
|
|
- change layout for straight USB dongle
|
|
|
|
- generate proper BOM
|
|
|
|
- implement sleep mode
|
|
|
|
- (atben) verify SPI signal timing, particularly the data clock
|
|
|
|
|
|
ccrf
|
|
====
|
|
|
|
Board similar to the atrf, but with the TI/Chipcon CC2520.
|
|
|
|
Cancelled. The CC2520 falls under US export restrictions, apparently because
|
|
it contains an AES engine.
|
|
|
|
|
|
cntr
|
|
====
|
|
|
|
Simple USB-based counter to measure a clock's long-time accuracy with
|
|
arbitrarily high precision, by comparing it to an NTP time reference.
|
|
|
|
|
|
Things not done yet
|
|
-------------------
|
|
|
|
- measure duty cycle
|
|
|
|
- use the LED to display activity on clock input and duty cycle
|
|
|
|
- consider using a comparator and a DAC to allow for programmable logic levels
|
|
|
|
- evaluate termination resistance
|
|
|
|
- document circuit design
|
|
|
|
- record beats between 16 bit counter polls and use them for the estimate
|
|
of lost cycles (2*1 is way too optimistic)
|
|
|
|
- include system clock resolution in accuracy calculation
|
|
|
|
- consider running shorter sliding windows to estimate drift
|
|
|
|
- consider detecting unusual half-periods
|
|
|
|
- consider using a reversed USB connector, to avoid having to cross D+/D- and,
|
|
worse, VBUS and GND
|
|
|
|
- test input performance by counting a source that emits a known number of
|
|
cycles
|
|
|
|
- consider using historical margins to sanity-check the current margin (if any
|
|
old.max < curr.min or old.min > curr.max, we have a problem) and to further
|
|
narrow the effective margin, thus achieving faster convergence. We would have
|
|
to consider temperature drift of the frequency source in this case.
|
|
|
|
- find out why frequency measurements always seem to start high and then slowly
|
|
drop
|