vdr
1.7.27
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00001 /********************************************************************** 00002 * 00003 * HDFF firmware command interface library 00004 * 00005 * Copyright (C) 2011 Andreas Regel 00006 * 00007 * This program is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU General Public License 00009 * as published by the Free Software Foundation; either version 2 00010 * of the License, or (at your option) any later version. 00011 00012 * This program is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 * GNU General Public License for more details. 00016 00017 * You should have received a copy of the GNU General Public License 00018 * along with this program; if not, write to the 00019 * Free Software Foundation, Inc., 00020 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 00021 * 00022 *********************************************************************/ 00023 00024 #include "hdffcmd_base.h" 00025 00026 void HdffCmdBuildHeader(BitBuffer_t * MsgBuf, HdffMessageType_t MsgType, 00027 HdffMessageGroup_t MsgGroup, HdffMessageId_t MsgId) 00028 { 00029 BitBuffer_SetBits(MsgBuf, 16, 0); // length field will be set later 00030 BitBuffer_SetBits(MsgBuf, 6, 0); // reserved 00031 BitBuffer_SetBits(MsgBuf, 2, MsgType); 00032 BitBuffer_SetBits(MsgBuf, 8, MsgGroup); 00033 BitBuffer_SetBits(MsgBuf, 16, MsgId); 00034 } 00035 00036 uint32_t HdffCmdSetLength(BitBuffer_t * MsgBuf) 00037 { 00038 uint32_t length; 00039 00040 length = BitBuffer_GetByteLength(MsgBuf) - 2; 00041 MsgBuf->Data[0] = (uint8_t) (length >> 8); 00042 MsgBuf->Data[1] = (uint8_t) length; 00043 00044 return length + 2; 00045 }