7ea1357336
Make getc(0) polling (this has the happy side effect of saving 8 bytes in the generated code).
63 lines
2.4 KiB
C
63 lines
2.4 KiB
C
/*-
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* Copyright (c) 2006 M. Warner Losh. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This software is derived from software provided by kwikbyte without
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* copyright as follows:
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*
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* No warranty, expressed or implied, is included with this software. It is
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* provided "AS IS" and no warranty of any kind including statutory or aspects
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* relating to merchantability or fitness for any purpose is provided. All
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* intellectual property rights of others is maintained with the respective
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* owners. This software is not copyrighted and is intended for reference
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* only.
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*
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* $FreeBSD$
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*/
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#include "at91rm9200.h"
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#include "at91rm9200_lowlevel.h"
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#include "lib.h"
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/*
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* int getc(int seconds)
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*
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* Reads a character from the DBGU port, if one is available within about
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* seconds seconds. It assumes that DBGU has already been initialized.
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*/
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int
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getc(int seconds)
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{
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AT91PS_USART pUSART = (AT91PS_USART)AT91C_BASE_DBGU;
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unsigned thisSecond;
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thisSecond = GetSeconds();
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seconds = thisSecond + seconds;
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do {
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if ((pUSART->US_CSR & AT91C_US_RXRDY))
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return (pUSART->US_RHR & 0xFF);
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thisSecond = GetSeconds();
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} while (thisSecond < seconds);
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return (-1);
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}
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