48 lines
2.0 KiB
C
48 lines
2.0 KiB
C
/* Serial Input for the Visium processor.
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Copyright (c) 2015 Rolls-Royce Controls and Data Services Limited.
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All rights reserved.
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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 are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* 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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* Neither the name of Rolls-Royce Controls and Data Services Limited nor
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the names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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THE POSSIBILITY OF SUCH DAMAGE. */
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char
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inbyte (void)
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{
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#ifdef __VISIUM_ARCH_MCM__
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volatile int *const rxdata = (int *) 0x20003920;
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volatile int *const rxqs = (int *) 0x20003930;
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#else
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volatile int *const rxdata = (int *) 0x20001a20;
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volatile int *const rxqs = (int *) 0x20001a30;
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#endif
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int bytes_in_fifo = 0;
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while (!bytes_in_fifo)
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bytes_in_fifo = *rxqs;
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/* Read one character. */
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return (*rxdata) & 0xff;
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}
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