DreamTeam/pastebin - Revision history

Bfb at 00:48, 26 August 2013

2013-08-26T00:48:09Z

← Older revision		Revision as of 17:48, 25 August 2013
Line 1:		Line 1:
	<code>		<code>
			[[File:fftsim.txt]]
	[[File:Foo.txt]]		[[File:Foo.txt]]
	[[File:Mindwave reader alpha.txt]]		[[File:Mindwave reader alpha.txt]]

Danf: wikipedia links for digital numeracy

2013-05-28T18:23:20Z

wikipedia links for digital numeracy

← Older revision		Revision as of 11:23, 28 May 2013
Line 71:		Line 71:
	>= 0x80 "multi-byte code"		>= 0x80 "multi-byte code"
	0x80 RAW Wave Value		0x80 RAW Wave Value
	single 16-bit 2s-complement signed big-endian (-32768 to 32767)		single 16-bit [https://en.wikipedia.org/wiki/Two%27s_complement 2s-complement] signed [https://en.wikipedia.org/wiki/Endianness big-endian] (-32768 to 32767)
	0x83 ASIC_EEG_POWER		0x83 ASIC_EEG_POWER
	8 24-bit 2s-complement unsigned big-endian (0 to 16,777,216)		8 24-bit 2s-complement unsigned big-endian (0 to 16,777,216)

Bfb at 04:52, 27 May 2013

2013-05-27T04:52:41Z

← Older revision		Revision as of 21:52, 26 May 2013
Line 72:		Line 72:
	0x80 RAW Wave Value		0x80 RAW Wave Value
	single 16-bit 2s-complement signed big-endian (-32768 to 32767)		single 16-bit 2s-complement signed big-endian (-32768 to 32767)
	0x
	0x83 ASIC_EEG_POWER		0x83 ASIC_EEG_POWER
			8 24-bit 2s-complement unsigned big-endian (0 to 16,777,216)
	"		"

Line 81:		Line 81:

	...............		...............
	~~<code>~~

	sync_flag_count = 0		sync_flag_count = 0

Bfb at 08:46, 26 May 2013

2013-05-26T08:46:30Z

← Older revision		Revision as of 01:46, 26 May 2013
Line 1:		Line 1:
	<code>		<code>
	[[File:Foo.txt]]		[[File:Foo.txt]]
	[[File:Mindwave reader alpha.txt]]		[[File:Mindwave reader alpha.txt]]

	asynchronous serial stream of bytes		asynchronous serial stream of bytes

Bfb at 08:46, 26 May 2013

2013-05-26T08:46:19Z

← Older revision		Revision as of 01:46, 26 May 2013
Line 1:		Line 1:
	<code>		<code>
			[[File:Foo.txt]]
			[[File:Mindwave reader alpha.txt]]

	asynchronous serial stream of bytes		asynchronous serial stream of bytes

Bfb at 06:31, 26 May 2013

2013-05-26T06:31:31Z

← Older revision		Revision as of 23:31, 25 May 2013
Line 78:		Line 78:

	...............		...............
			<code>

	sync_flag_count = 0		sync_flag_count = 0
	valid_plength = False		valid_plength = False
	valid_payload = False		valid_payload = False
	plength = -1		plength = -1
	have_checksum = False		have_checksum = False
	payload_byte_count = 0		payload_byte_count = 0
	buffer_size = 256		buffer_size = 256
	payload_buffer = byte_array(buffer_size)		payload_buffer = byte_array(buffer_size)

	while (stream)		while (stream)

Danf: pseudocode

2013-05-26T06:18:57Z

pseudocode

New page

<code>
asynchronous serial stream of bytes

3 parts

header
payload
checksum

transport medium UART serial comm USB bluetooth and any mechanism which can stream bytes

packet begins with header
then payload
ends with payloads's checksum byte

payload section may be up to 169 bytes long

each of sync, plength, and checksum are 1 byte each
header consists of 2 syncs and 1 plength bytes

so, possible packet
sync sync plength (1+1+1)
payload (169)
checksum (1)
so minumum 4 (? empty payload)
maximum 173

header
2 sync bytes signal beginning of new packet
0xaa

issue of 2 sync "special 0xaa" appear in data
therefore plength and checksum are necessary
to avoid in-band signal/data ambiguity mis-parsing

plength == payload length not packet length
so if larger than 169 then error
can be 0

payload
don't parse until verify checksum
checksum
sum bytes
take lowest 8 bits
perform bit inverse

payload is series of data rows

data row format:
value type

there can be 0 or more data rows

each data row begins with
0 or more Extended Code Flag Byte (0x55)
Extended Code Level (not yet implemented) given by ECFB count
1 Code bytes (which will never by 0x55/ECFB or 0xaa/sync)
0 or 1 VLength bytes (signalled by Code <= 0x7f)
1 or more Value bytes

<= 0x7f "single-byte code"
0x02 POOR_SIGNAL
0x04 ATTENTION
0x05 MEDITATION
0x16 BLINK EVENT
unsigned 2s-complement

>= 0x80 "multi-byte code"
0x80 RAW Wave Value
single 16-bit 2s-complement signed big-endian (-32768 to 32767)
0x
0x83 ASIC_EEG_POWER
"

...............

sync_flag_count = 0
valid_plength = False
valid_payload = False
plength = -1
have_checksum = False
payload_byte_count = 0
buffer_size = 256
payload_buffer = byte_array(buffer_size)

while (stream)
get abyte

if sync_flag_count < 2
if abyte not sync
(trace out-of-sync value, sync_flag_count)
sync_flag_count = 0
continue
increment sync_flag_count
if sync_flag_count < 2
continue
(trace successful sync)

if not valid_plength
plength = abyte
valid_plength = test_plength(plength) (value from 0 to 170)
if not valid_plength
(trace not valid_plength)
plength = -1
continue
(trace valid_plength)

if not have_checksum
checksum = abyte
have_checksum = True
(trace checksum)
continue

if payload_byte_count < plength
payload_buffer.append(abyte)
increment payload_byte_count
trace(payload_buffer, payload_byte_count)
continue

if payload_byte_count > plength
valid_payload = False
(trace serious logic error)
break

valid_payload = test_payload(payload, plength, checksum)

if valid_payload
(trace valid_payload)
parse_payload(payload_buffer)
else
(trace not valid_payload)

reset_flags(plength, checksum, etc)

</code>

<code>
state progression:
need_socket
receiving_signal
- loop
need_first_sync
need_second_sync
need_plength
need_checksum
need_payload
need_paysum
- loop
payload_remaining
need_datarow
need_codelevel
need_codetype
need_vlength
need_val
valid_data
-
valid_packet
-
</code>