Root/TODO

Source at commit 7fbcfaa33761b5bc8f0123002e302bdca4106a87 created 9 years 2 months ago.
By Werner Almesberger, U-turn: The US restrict export of the CC2520. Atmel scores a design win.
1General
2=======
3
4Things not done yet
5-------------------
6
7- document directory hierarchy
8
9- make sure all files have a copyright header or are listed in AUTHORS
10
11- connect all the bits and pieces of the build system
12
13- combine io-parts.h generation
14
15- combine "standard" EP0 commands, such as *_ID and *_BUILD
16
17- implement return to DFU in application's EP0 protocol
18
19- consider removing *_ID and using bcdDevice instead
20
21
22Bugs to fix
23-----------
24
25- builds fail if .version isn't there yet
26
27
28
29atrf
30====
31
32AT86RF230-based IEEE 802.15.4 transceiver. Two variantes: one to make a USB
33dongle for use with any Linux host, and one that connects with SPI directly
34inside a Ben.
35
36
37Things not done yet
38-------------------
39
40- examine spectrum around carrier frequency and first harmonic to look for
41  obvious distortions. Vary transmit power.
42
43- measure throughput as a function of placement/distance, carrier frequency,
44  and transmit power
45
46- atspi-txrx: suppport "extended mode" with IEEE 802.15.4 CSMA-CA for more
47  realistic throughput figures
48
49- measure full spectrum (ideally up to 25 GHz, but just 2nd and 3rd harmonic
50  will already tell most of the story) with calibrated antenna for FCC/ETSI
51  compliance assessment. Vary transmit power.
52
53- use IEEE 802.15.4 stack from linux-zigbee
54
55- verify that the Ben can output an a) 16 MHz clock, and b) with +/- 40 ppm
56
57- replace discrete balun and filter with integrated solution, to reduce BOM
58  size, maybe cost, insertion loss, and PCB space (see ATRF/ECN0003)
59
60- check if we really need three DC blocking caps in the RF path
61
62- change layout of transceiver side of the board for placement inside Ben
63
64- define EMI filters for placement inside Ben
65
66- check USB standard for recommended USB dongle dimensions
67
68- change layout for straight USB dongle
69
70- generate proper BOM
71
72- implement sleep mode
73
74
75Bugs to fix
76-----------
77
78- atrf vs. atspi naming is a bit confusing
79
80
81ccrf
82====
83
84Board similar to the atrf, but with the TI/Chipcon CC2520.
85
86
87cntr
88====
89
90Simple USB-based counter to measure a clock's long-time accuracy with
91arbitrarily high precision, by comparing it to an NTP time reference.
92
93
94Things not done yet
95-------------------
96
97- measure duty cycle
98
99- use the LED to display activity on clock input and duty cycle
100
101- consider using a comparator and a DAC to allow for programmable logic levels
102
103- evaluate termination resistance
104
105- document circuit design
106
107- record beats between 16 bit counter polls and use them for the estimate
108  of lost cycles (2*1 is way too optimistic)
109
110- include system clock resolution in accuracy calculation
111
112- consider running shorter sliding windows to estimate drift
113
114- consider detecting unusual half-periods
115
116- consider using a reversed USB connector, to avoid having to cross D+/D- and,
117  worse, VBUS and GND
118
119- test input performance by counting a source that emits a known number of
120  cycles
121
122- consider using historical margins to sanity-check the current margin (if any
123  old.max < curr.min or old.min > curr.max, we have a problem) and to further
124  narrow the effective margin, thus achieving faster convergence. We would have
125  to consider temperature drift of the frequency source in this case.
126
127- find out why frequency measurements always seem to start high and then slowly
128  drop
129

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