brmlab project:weathersonde

CPU - DSP1C

Anonymous (anonymous@undisclosed.example.com) — 2018-09-24T11:48:29+00:00

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	{{:project:weathersonde:sonde_cpu_lowres_blocks.jpg?600\|Chip imge with block numbering}}		{{:project:weathersonde:sonde_cpu_lowres_blocks.jpg?600\|Chip imge with block numbering}}

-	* [[http://nat.brmlab.cz/project/weathersonde/sonde_cpu_lowres.jpg\|Chip image - high resolution]]	+	{{:project:weathersonde:sonde_cpu_lowres.jpg?200\|VSDPS decapped chip image}}

Arduino sketch for control via SPI

Anonymous (anonymous@undisclosed.example.com) — 2018-10-01T13:48:30+00:00

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-	== connection note ==	+	==== connection note ====

	This post was send by email, if You have difficulty to read/write eeprom, try this		This post was send by email, if You have difficulty to read/write eeprom, try this
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		+	===== Code =====

Vaisala RS92-SGPD firmware

Anonymous (anonymous@undisclosed.example.com) — 2018-09-24T11:51:14+00:00

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	* addr - data destination address in X memory (instruction memory should be mapped to X+0x2000)		* addr - data destination address in X memory (instruction memory should be mapped to X+0x2000)

-	* [[http://nat.brmlab.cz/project/weathersonde/vsdsp2_um.pdf\|VS_DSP v2 Users manual]] << this one is used in sonde CPU	+	* {{ :project:weathersonde:vsdsp2_um.pdf \|VS_DSP v2 Users manual}} (this one is used in sonde CPU)
-	* [[http://nat.brmlab.cz/project/weathersonde/vsdsp4_ump.pdf\|VS_DSP v4 Users manual]]	+	* {{ :project:weathersonde:vsdsp4_ump.pdf \|VS_DSP v4 Users manual}}

	==== blob 2 ====		==== blob 2 ====

Vaisala weather sonde hardware

Anonymous (anonymous@undisclosed.example.com) — 2016-06-17T20:43:45+00:00

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	\| 5 \| THERM \| connect directly to thermistor on sensors stick (silver blob) \|		\| 5 \| THERM \| connect directly to thermistor on sensors stick (silver blob) \|
	\| 6 \| START \| restart measurement cycle (3V pull-up, 1 ms pulse to 0V, repeats with 1sec period) \|		\| 6 \| START \| restart measurement cycle (3V pull-up, 1 ms pulse to 0V, repeats with 1sec period) \|
-	\| 7 \| SENS_SELECT \| cycle trought sensors (3V pull-up, 2ms pulse to 0V to select next sensor, 30-40 ms per measurement, 8 pull-down pullses before measurement restart) \|	+	\| 7 \| SENS_SELECT \| cycle through sensors (3V pull-up, 2ms pulse to 0V select next sensor, 30-40 ms per measurement, 8 pull-down pulses before measurement restart. The sensor order is the same as order of measurement data in data frame) \|
	\| 8 \| HEAT_BOTTOM \| enable heating for lower humidity sensor (0 V - disabled, 3V - enabled) \|		\| 8 \| HEAT_BOTTOM \| enable heating for lower humidity sensor (0 V - disabled, 3V - enabled) \|

PCB and schematic

Anonymous (anonymous@undisclosed.example.com) — 2018-09-24T11:25:19+00:00

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	* draw schematics		* draw schematics
	* find out values of components		* find out values of components
-
-	* http://nat.brmlab.cz/project/weathersonde/pcb_analyse/
-
-

	* main PCB back side top layer \\ {{:project:weathersonde:imgp8648.jpg?400\|main PCB back side top layer}}		* main PCB back side top layer \\ {{:project:weathersonde:imgp8648.jpg?400\|main PCB back side top layer}}

Weathersonde

Anonymous (anonymous@undisclosed.example.com) — 2017-04-14T08:50:33+00:00

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	* [[http://www2.plala.or.jp/hikokibiyori/soft/kgrs/index.html]]		* [[http://www2.plala.or.jp/hikokibiyori/soft/kgrs/index.html]]
	* [[http://www.das-labor.org/wiki/RS92-SGPA]]		* [[http://www.das-labor.org/wiki/RS92-SGPA]]
-	* http://jenda.hrach.eu/sonda.cgi-sh	+	* [[http://jenda.hrach.eu/sonda.cgi-sh]]
		+	* [[https://github.com/rs1729/RS.git]] OSS Radio sonde decoding SW

Telemetry decoding

Anonymous (anonymous@undisclosed.example.com) — 2017-02-19T16:58:46+00:00

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	\| 1 \| 1 \| SUBFRAME_LEN \| Length of subframe payload \|		\| 1 \| 1 \| SUBFRAME_LEN \| Length of subframe payload \|
	\| 2 \| 2*SUBFRAME_LEN \| SUBFRAME_PAYLOAD \| subframe payload \|		\| 2 \| 2*SUBFRAME_LEN \| SUBFRAME_PAYLOAD \| subframe payload \|
-	\| 2*SUBFRAME_LEN+2 \| 2 \| SUBFRAME_CRC \| CRC 16 of subframe payload, polynom = 0x11021 \|	+	\| 2SUBFRAME_LEN+2 \| 2 \| SUBFRAME_CRC \| CRC 16 of subframe payload, polynom = 0x11021 (0x1021 withought leadeing 1)* \|

	==== Known subframe types ====		==== Known subframe types ====

Telemetry receiving

Anonymous (anonymous@undisclosed.example.com) — 2013-11-20T18:25:26+00:00

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	+	====== Telemetry receiving ======

	+	This page describes how acquire telemetry from Vaisala weather radio sonde RS92. It comprises demodulation, descrambling, and conversion of bite stream to bytes and frames. Detailed description of packet structure is available in [[telemetry_decoding]].
	+
	+	===== Demodulation =====
	+
	+	* radiosode type: RS92-SGPD
	+	* modulation: GFSK - 4800 baud
	+
	+	GFSK block from GNURadio can be used to demodulate this signal. Custom block are used for data decoding.
	+
	+	===== Decoding =====
	+
	+	==== conversion of demodulated signal into bite stream ====
	+	* demodulated data stream contains symbols
	+	* 2 adjescent symbols represent one bite of data
	+	* symbols to bites mapping (Manchester code is used):
	+	* 10 -> 0
	+	* 01 -> 1
	+	* 00, 11 -> invalid (error in reception or stream is shifted by one symbol)
	+
	+	Data stream atructure (symbols)
	+	2 start symbols
	+	\|\|
	+	...sSsSsSsS0110sSsSsSsSsSsSsSsS0110sSsSsSsSsSsSsSsS0110sSsSsSsS...
	+	16 data \|\|
	+	symbols 2 stop symbols
	+
	+	==== conversion of bite stream into byte stream ====
	+	* bite stream have structure identical to 8bit asynchronous serial protocol
	+	* 1 start bite (0), 8 data bites (LSB first), 1 stop bite (1)
	+
	+	Data stream atructure (bites)
	+	Start bite
	+	\|
	+	...xxxx10xxxxxxxx10xxxxxxxx10xxxx...
	+	8 data \|
	+	bits Stop bite
	+	LSB first
	+
	+	* removing synchronization bits allow us create stream of bytes
	+
	+	==== conversion of byte stream into frames (packets) ====
	+	* byte stream is dividen into frames 240B long
	+	* each frame starts with predefined byte sequence
	+
	+	Frame start pattern (8B)
	+	\|
	+	SSSSSSSSDDD....DDD
	+
	+	* frame have attached Reed-solomon correction code, RS(255,231)
	+	* frame is divided into 4 subblocks
	+	* each subblock have different, but fixed length
	+
	+	==== Frame structure 240B ====
	+
	+	^ offset (B) ^ lenght (B) ^ name ^ (content) description ^
	+	\| 0 \| 6 \| FRAME_HDR \| (0x2A 0x2A 0x2A 0x2A 0x2A 0x10) frame header \|
	+	\| 6 \| 210 \| FRAME_PAYLOAD\| frame payload data \|
	+	\| 216 \| 24 \| FRAME_PAYLOAD_ECC \| RS(255, 231) Reed-Solomon correction code for frame payload \|
	+
	+
	+	==== Reed-Solomon ====
	+
	+	It si common RS(255, 231) code.
	+
	+	* symbol size: 8
	+	* generating polynomial: 0x11d
	+	* first consecutive root: 0
	+	* correction code is computed only for frame payload.
	+	* byte order is reverser
	+	* RS block is prepend with zeroes
	+
	+	RS blob structure:
	+	* padding (21 x 0x00)
	+	* FRAME_PAYLOAD, byte order is reversed (firt byte in frame payload is last byte for RS evaluation)
	+	* 24B of FRAME_PAYLOAD_ECC, byte order is reversed (firt byte of RS in frame is last byte for RS evaluation)
	+
	+
	+	==== related links ====
	+
	+	* [[http://ams.confex.com/ams/pdfpapers/69226.pdf]]

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	\| 5 \| THERM \| connect directly to thermistor on sensors stick (silver blob) \|		\| 5 \| THERM \| connect directly to thermistor on sensors stick (silver blob) \|
	\| 6 \| START \| restart measurement cycle (3V pull-up, 1 ms pulse to 0V, repeats with 1sec period) \|		\| 6 \| START \| restart measurement cycle (3V pull-up, 1 ms pulse to 0V, repeats with 1sec period) \|
-	\| 7 \| SENS_SELECT \| cycle trought sensors (3V pull-up, 2ms pulse to 0V to select next sensor, 30-40 ms per measurement, 8 pull-down pullses before measurement restart) \|	+	\| 7 \| SENS_SELECT \| cycle through sensors (3V pull-up, 2ms pulse to 0V select next sensor, 30-40 ms per measurement, 8 pull-down pulses before measurement restart. The sensor order is the same as order of measurement data in data frame) \|
	\| 8 \| HEAT_BOTTOM \| enable heating for lower humidity sensor (0 V - disabled, 3V - enabled) \|		\| 8 \| HEAT_BOTTOM \| enable heating for lower humidity sensor (0 V - disabled, 3V - enabled) \|