aplfw/driver/serial/renesas/scidrv_read.c

   1 /**
   2  *  Hyper Operating System  Application Framework
   3  *
   4  * @file  scidrv.c
   5  * @brief %jp{Renesas H8/SH用 SCIデバイスドライバ}
   6  *
   7  * Copyright (C) 2006-2007 by Project HOS
   8  * http://sourceforge.jp/projects/hos/
   9  */
  10
  11
  12 #include "scidrv_local.h"
  13
  14
  15 /** %jp{受信} */
  16 FILE_SIZE SciDrv_Read(C_DRVOBJ *pDrvObj, C_FILEOBJ *pFileObj, void *pBuf, FILE_SIZE Size)
  17 {
  18         C_SCIDRV                *self;
  19         C_SYNCFILE              *pFile;
  20         unsigned char   *pubBuf;
  21         FILE_ERR                ErrCode;
  22         FILE_SIZE               i;
  23         int                             c;
  24
  25         /* upper cast */
  26         self  = (C_SCIDRV *)pDrvObj;
  27         pFile = (C_SYNCFILE *)pFileObj;
  28
  29         pubBuf = (unsigned char *)pBuf;
  30
  31         /* 読込み処理開始 */
  32         if ( (ErrCode = SyncDrv_StartProcess(&self->SyncDrv, pFile, SYNCDRV_FACTOR_READ)) != FILE_ERR_OK )
  33         {
  34                 return (FILE_SIZE)ErrCode;
  35         }
  36
  37         /* 読込みシグナルを一旦クリア */
  38         SyncFile_ClearSignal(pFile, SYNCDRV_FACTOR_READ);
  39
  40         for ( i = 0; i < Size; i++ )
  41         {
  42                 /* 読み出し */
  43                 while ( (c = StreamBuf_RecvChar(&self->StmBufRecv)) < 0 )
  44                 {
  45                         /* ブロッキングモードでなければ抜ける */
  46                         if ( SyncFile_GetSyncMode(pFile, SYNCDRV_FACTOR_READ) != FILE_SYNCMODE_BLOCKING )
  47                         {
  48                                 SyncDrv_EndProcess(&self->SyncDrv, SYNCDRV_FACTOR_READ, i);
  49                                 return i;
  50                         }
  51
  52                         /* 受信を待つ */
  53                         SyncFile_WaitSignal(pFile, SYNCDRV_FACTOR_READ);
  54
  55                         /* 読込みシグナルをクリアしてリトライ */
  56                         SyncFile_ClearSignal(pFile, SYNCDRV_FACTOR_READ);
  57                 }
  58
  59                 /* 読み出せた文字を格納 */
  60                 *pubBuf++ = (unsigned char)c;
  61         }
  62
  63         /* 読み出し処理完了 */
  64         SyncDrv_EndProcess(&self->SyncDrv, SYNCDRV_FACTOR_READ, (VPARAM)i);
  65
  66         return i;
  67 }
  68
  69
  70 /* end of file */