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GLAST / LAT > DAQ and FSW > FSW > Doxygen Index> LEM / V4-8-0 > lem / sun-gcc

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decode.ih File Reference

Unpack the payload of a result item. More...

#include "PBS/PARITY.ih"

Functions
static void	decode_ul (const unsigned short *pkt, unsigned short nWords, unsigned *value)
	Unpacks the result of a read.
static void	decode_cal (const unsigned short *pkt, CAL_rsp *rsp)
	Copies the response from a result item.
static void	decode_tkr (const unsigned short *pkt, TKR_rsp *rsp)
static void	decode_acd (const unsigned short *pkt, ACD_rsp *rsp)

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Detailed Description

Unpack the payload of a result item.

Author:

James Swain - jswain@slac.stanford.edu

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Function Documentation

void decode_acd	(	const unsigned short *	pkt,
		ACD_rsp *	rsp
	)			[static]

Parameters:

	pkt	pointer to response payload data
	rsp	pointer to memory to hold off board GARC/GAFE response data

Returns:

void

format of GARC response in 16-bit chunks

-------------------------------- 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 -------------------------------- 0000 (0000) A B C C C C C D E F F F F G H H 0001 (0000) H H H H H H H H H H H H H H I J

where,

A - 1 bit. Start bit B - 1 bit. Copy of write command field ( 0 for GARC, 1 for GAFE ). C - 5 bits. Copy of write command field ( GARC func block, or GAFE address). D - 1 bit. Read/Write bit. Always 1 for read. E - 1 bit. Data/Dataless, always 1. F - 4 bits. Copy of write command field ( GARC func code or GAFE register). G - 1 bit. Odd parity over previous 12 bits. H - 16 bits. Data payload, MSB first. I - 1 bit. Summary error detected. J - 1 bit. Odd parity over previous 17 bits.

void decode_cal	(	const unsigned short *	pkt,
		CAL_rsp *	rsp
	)			[static]

Copies the response from a result item.

Parameters:

	pkt	Pointer to result item payload
	rsp	Pointer to memory to hold decoded payload

void decode_tkr	(	const unsigned short *	pkt,
		TKR_rsp *	rsp
	)			[static]

Parameters:

	pkt	pointer to response payload data
	rsp	Pointer to structure holding TKR 64-bit response data and TKR response flags

Returns:

void

Format of off-board tracker response in 16-bit chunks

-------------------------------- 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 -------------------------------- 0000 (0000) A A A A A A A A A A A A A A A A 0001 (0000) 1 D D D D D D D D D D D D D D D 0002 (0000) D 1 D D D D D D D D D D D D D D 0003 (0000) D D 1 D D D D D D D D D D D D D 0004 (0000) D D D 1 D D D D D D D D D D D D 0005 (0000) D D D D E P [<---- MBZ ------>]

meaning ------------------------------- A -- access descriptor, 16 bits D -- response data, 64 bits with a "1" preceeding each 16-bit chunk E -- error summary, 1 bit P -- parity, 1 bit

void decode_ul	(	const unsigned short *	pkt,
		unsigned short	nWords,
		unsigned *	value
	)			[static]

Unpacks the result of a read.

Parameters:

	pkt	Payload from a result item
	nWords	Number of 32-bit words in the response
	value	Pointer to location to copy repsonse to

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