mirror of
git://projects.qi-hardware.com/ben-wpan.git
synced 2024-11-04 23:44:59 +02:00
120 lines
2.9 KiB
Plaintext
120 lines
2.9 KiB
Plaintext
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General
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=======
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Things not done yet
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-------------------
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- document directory hierarchy
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- make sure all files have a copyright header or are listed in AUTHORS
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- connect all the bits and pieces of the build system
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- combine io-parts.h generation
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- combine "standard" EP0 commands, such as *_ID and *_BUILD
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- implement return to DFU in application's EP0 protocol
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Bugs to fix
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-----------
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- builds fail if .version isn't there yet
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atrf
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====
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AT86RF230-based IEEE 802.15.4 transceiver. Two variantes: one to make a USB
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dongle for use with any Linux host, and one that connects with SPI directly
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inside a Ben.
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Things not done yet
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-------------------
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- define values for crystal load capacitors. Measurements with instruments not
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quite precise enough (+/- 100 ppm) for the task (+/- 40 ppm, preferably
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< +/- 10 ppm) suggest that we're about 300 ppm off with no capacitors at all
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and can only correct about 150 ppm with the internal trim capacitors.
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- examine spectrum around carrier frequency and first harmonic to look for
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obvious distortions. Vary transmit power.
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- measure throughput as a function of placement/distance, carrier frequency,
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and transmit power
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- atspi-txrx: suppport "extended mode" with IEEE 802.15.4 CSMA-CA for more
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realistic throughput figures
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- measure full spectrum (ideally up to 25 GHz, but just 2nd and 3rd harmonic
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will already tell most of the story) with calibrated antenna for FCC/ETSI
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compliance assessment. Vary transmit power.
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- use IEEE 802.15.4 stack from linux-zigbee
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- verify that the Ben can output an a) 16 MHz clock, and b) with +/- 40 ppm
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- replace discrete balun and filter with integrated solution, to reduce BOM
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size, maybe cost, insertion loss, and PCB space
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- check if we really need three DC blocking caps in the RF path
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- change layout of transceiver side of the board for placement inside Ben
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- define EMI filters for placement inside Ben
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- check USB standard for recommended USB dongle dimensions
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- change layout for straight USB dongle
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- generate proper BOM
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- implement sleep mode
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Bugs to fix
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-----------
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- two of my systems (tv and u1010) flat out refuse to talk to the board's USB
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application, but have no problem talking to its DFU boot loader. Very
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strange.
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- atrf vs. atspi naming is a bit confusing
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ccrf
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====
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Board similar to the atrf, but with the TI/Chipcon CC2520.
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cntr
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====
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Simple USB-based counter to measure a clock's long-time accuracy with
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arbitrarily high precision, by comparing it to an NTP time reference.
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Things not done yet
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-------------------
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- measure duty cycle
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- display activity on clock input and duty cycle
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- consider using a comparator and a DAC to allow for programmable logic levels
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- evaluate termination resistance
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- document circuit design
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Bugs to fix
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-----------
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- the firmware flashes okay and there are no outward signs of problems, yet the
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board doesn't do anything so far, not even blink the LED. Kinda embarrassing.
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