080210ec99
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5416 42af7a65-404d-4744-a932-0658087f49c3
104 lines
3.8 KiB
C
104 lines
3.8 KiB
C
/********************************************************************************
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* configs/z80sim/src//z80_lowputc.c
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*
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* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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********************************************************************************/
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/********************************************************************************
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* Included Files
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********************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <assert.h>
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#include <debug.h>
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#include "os_internal.h"
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#include "up_internal.h"
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/********************************************************************************
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* Definitions
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********************************************************************************/
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/********************************************************************************
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* Public Data
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********************************************************************************/
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/********************************************************************************
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* Private Data
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********************************************************************************/
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/********************************************************************************
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* Private Functions
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********************************************************************************/
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/********************************************************************************
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* Public Functions
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********************************************************************************/
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/********************************************************************************
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* Name: z80_lowputc
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*
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* Data sent to port 0xbe are echoed on stdout by the simulation
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*
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********************************************************************************/
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void z80_lowputc(char ch) __naked
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{
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__asm__ (
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"\tld hl, #2\n"
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"\tadd hl, sp\n"
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"\tld a, (hl)\n"
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"\tout (0xbe), a\n"
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"\tret\n"
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);
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}
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/********************************************************************************
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* Name: z80_lowgetc
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*
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* Data from stdin can be received on port 0xbe in the simulation
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*
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********************************************************************************/
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char z80_lowgetc(void) __naked
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{
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__asm__ (
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"\tin a, (0xbe)\n"
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"\tld l, a\n"
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"\tld h, #0\n"
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"\tret\n"
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);
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}
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