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/****************************************************************************
* arch/z80/src/z180/z180_lowscc.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <stdint.h>
#include <string.h>
#include <arch/io.h>
#include <nuttx/arch.h>
#include <nuttx/sched.h>
#include "chip/chip.h"
#include "common/up_internal.h"
#include "z180_config.h"
#if defined(USE_LOWSERIALINIT) && defined(HAVE_SCC)
/****************************************************************************
* Private Definitions
****************************************************************************/
/* Select UART parameters for the selected console */
#if defined(CONFIG_Z180_SCC_SERIAL_CONSOLE)
# define CONSOLE_CR Z181_SCC_CR
# define CONSOLE_DR Z181_SCC_DR
# define CONSOLE_BAUD CONFIG_Z180_SCC_BAUD
# define CONSOLE_BITS CONFIG_Z180_SCC_BITS
# define CONSOLE_2STOP CONFIG_Z180_SCC_2STOP
# define CONSOLE_PARITY CONFIG_Z180_SCC_PARITY
#elif defined(CONFIG_Z180_ESCCA_SERIAL_CONSOLE)
# define CONSOLE_CR Z182_ESCCA_CR
# define CONSOLE_DR Z182_ESCCA_DR
# define CONSOLE_BAUD CONFIG_Z180_ESCCA_BAUD
# define CONSOLE_BITS CONFIG_Z180_ESCCA_BITS
# define CONSOLE_2STOP CONFIG_Z180_ESCCA_2STOP
# define CONSOLE_PARITY CONFIG_Z180_ESCCA_PARITY
#elif defined(CONFIG_Z180_ESCCB_SERIAL_CONSOLE)
# define CONSOLE_CR Z182_ESCCB_CR
# define CONSOLE_DR Z182_ESCCB_DR
# define CONSOLE_BAUD CONFIG_Z180_ESCCB_BAUD
# define CONSOLE_BITS CONFIG_Z180_ESCCB_BITS
# define CONSOLE_PARITY CONFIG_Z180_ESCCB_PARITY
#endif
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: z180_scc_lowinit
*
* Description:
* Called early in the boot sequence to initialize the [E]SCC console
* channel (only).
*
****************************************************************************/
#ifdef USE_LOWSERIALINIT
void z180_scc_lowinit(void)
{
#ifdef HAVE_SCC_CONSOLE
#warning "Missing logic"
#endif
}
#endif
/****************************************************************************
* Name: z180_putc
*
* Description:
* Low-level character output
*
****************************************************************************/
#ifdef HAVE_SCC_CONSOLE
void z180_putc(uint8_t ch) __naked
{
__asm
txbe:
in0 a,(CONSOLE_CR) ; Read RR0
bit 2, a ; Bit 2, Tx buffer empty?
jr z, txbe ; No, wait until the Tx buffer is empty
ld a, 4(ix) ; Character to output
out (CONSOLE_DR), a ; Send it
ret
__endasm;
}
#endif
#endif /* USE_LOWSERIALINIT && HAVE_SCC*/
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