\qquad 下面是HD-GR GNSS导航软件的BDS B1I电文处理相关定义：
// b1i_message.h -- Header file for the b1i_message.c file
/*
* Copyright (C) 2005 Andrew Greenberg
* Distributed under the GNU GENERAL PUBLIC LICENSE (GPL) Version 2 (June 1991).
* See the "COPYING" file distributed with this software for more information.
*/
/* Namuru GPS receiver project
* Original : message.h
* Modes : None
* version : V1.0
* date : 21st/Dec/2006
*/
/*
* HD-GR GNSS receiver project
* Modes : Inherited the definitions of message.h in the Namuru GPS receiver
* project V1.0 and made necessary adjustments to adapt to the new
* RTOS and functions.
* version : V1.0
* date : xx/xx/2015
*/
#ifndef __B1I_MESSAGE_H__
#define __B1I_MESSAGE_H__
#include "main_message.h"
/*******************************************************************************
* Definitions
******************************************************************************/
/*******************************************************************************
* Declarations
******************************************************************************/
typedef struct{
unsigned long word[10];
unsigned long SOW; // Time since beginning of the week in 1 second increments
unsigned long valid; // 10 bits of word validity flags; all good = 0x3ff
} b1i_subframe_t;
typedef struct{
unsigned short D; // BCH(15,11,1) shift register
unsigned short swd; // BCH(15,11,1) short words
} bchdc_t;
typedef struct {
unsigned short prn; // satellite prn
unsigned short frame_sync; // frame sync. flag
unsigned short set_epoch_flag; // only set the epoch counter once per sync on a channel
unsigned short data_inverted; // data inverted flag
unsigned short bitcount; // # of bits in the current word
unsigned short wordcount; // # of words in the subframe so far
unsigned long wordbuf0; // Current word (2+30 format)
unsigned long wordbuf1; // previous word (2+30 format)
bchdc_t bch_dc1, bch_dc2; // BCH(15,11,1) decoder data.
unsigned short subframe; // Current subframe #
b1i_subframe_t subframes[5]; // Array of 5 subframes (1 frame)
} b1i_message_t;
/*******************************************************************************
* Prototypes (Globally visible functions)
******************************************************************************/
void b1i_clear_messages(unsigned short ch) __attribute__ ((section(".isrcode.txt")));
void b1i_sync_frame(unsigned short ch, unsigned short bit) __attribute__ ((section(".isrcode.txt")));
void b1i_process_message(OS_FLAGS channels_with_bits, OS_FLAGS channel_bits) __attribute__ ((section(".isrcode.txt")));
/*******************************************************************************
* Externs
******************************************************************************/
extern b1i_message_t m_b1i_messages[B1I_MAX_CHANNELS] __attribute__ ((section(".isrdata.rwdata")));
#endif // __B1I_MESSAGE_H__