aplfw/driver/serial/at91/at91uartdrv_read.c

   1 /**
   2  *  Hyper Operating System  Application Framework
   3  *
   4  * @file  at91uartdrv_read.c
   5  * @brief %jp{ATMEL AT91シリーズUART用デバイスドライバ}
   6  *
   7  * Copyright (C) 2006-2007 by Project HOS
   8  * http://sourceforge.jp/projects/hos/
   9  */
  10
  11
  12 #include "at91uartdrv_local.h"
  13
  14
  15 /** %jp{受信} */
  16 FILE_SIZE At91UartDrv_Read(C_DRVOBJ *pDrvObj, C_FILEOBJ *pFileObj, void *pBuf, FILE_SIZE Size)
  17 {
  18         C_AT91UARTDRV   *self;
  19         C_CHRFILE               *pChrFile;
  20         unsigned char   *pubBuf;
  21         FILE_SIZE               i;
  22         int                             c;
  23
  24         /* upper cast */
  25         self     = (C_AT91UARTDRV *)pDrvObj;
  26         pChrFile = (C_CHRFILE *)pFileObj;
  27
  28         pubBuf = (unsigned char *)pBuf;
  29
  30         /* クリティカルセクションに入る */
  31         SysMtx_Lock(self->hMtxRecv);
  32
  33         for ( i = 0; i < Size; i++ )
  34         {
  35                 while ( (c = StreamBuf_RecvChar(&self->StmBufRecv)) < 0 )
  36                 {
  37                         if ( pChrFile->cReadMode == FILE_RMODE_BLOCKING )
  38                         {
  39                                 /* ブロッキングなら受信イベントを待つ */
  40                                 SysEvt_Wait(self->hEvtRecv);
  41                                 SysEvt_Clear(self->hEvtRecv);
  42                         }
  43                         else
  44                         {
  45                                 /* ノンブロッキングなら終了 */
  46                                 goto loop_end;
  47                         }
  48                 }
  49                 *pubBuf++ = (unsigned char)c;
  50         }
  51 loop_end:
  52
  53         /* クリティカルセクションを出る */
  54         SysMtx_Unlock(self->hMtxRecv);
  55
  56         return i;
  57 }
  58
  59
  60 /* end of file */