105 lines
3.7 KiB
C
105 lines
3.7 KiB
C
/********************************************************************************
|
|
* board/z80_lowputc.c
|
|
*
|
|
* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
********************************************************************************/
|
|
|
|
/********************************************************************************
|
|
* Included Files
|
|
********************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <nuttx/irq.h>
|
|
#include <nuttx/arch.h>
|
|
#include <assert.h>
|
|
#include <debug.h>
|
|
|
|
#include "os_internal.h"
|
|
#include "up_internal.h"
|
|
|
|
/********************************************************************************
|
|
* Definitions
|
|
********************************************************************************/
|
|
|
|
/********************************************************************************
|
|
* Public Data
|
|
********************************************************************************/
|
|
|
|
/********************************************************************************
|
|
* Private Data
|
|
********************************************************************************/
|
|
|
|
/********************************************************************************
|
|
* Private Functions
|
|
********************************************************************************/
|
|
|
|
/********************************************************************************
|
|
* Public Functions
|
|
********************************************************************************/
|
|
|
|
/********************************************************************************
|
|
* Name: z80_lowputc
|
|
*
|
|
* Data sent to port 0xbe are echoed on stdout by the simulation
|
|
*
|
|
********************************************************************************/
|
|
|
|
void z80_lowputc(char ch) __naked
|
|
{
|
|
_asm
|
|
ld hl, #2
|
|
add hl, sp
|
|
ld a, (hl)
|
|
out (0xbe), a
|
|
ret
|
|
_endasm;
|
|
}
|
|
|
|
/********************************************************************************
|
|
* Name: z80_lowgetc
|
|
*
|
|
* Data from stdin can be received on port 0xbe in the simulation
|
|
*
|
|
********************************************************************************/
|
|
|
|
char z80_lowgetc(void) __naked
|
|
{
|
|
_asm
|
|
in a, (0xbe)
|
|
ld l, a
|
|
ld h, #0
|
|
ret
|
|
_endasm;
|
|
}
|