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/**************************************************************************
* arch/arm/src/m9s12/m9s12_lowputc.S
*
* Copyright (C) 2009, 2011 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 "up_internal.h"
#include "m9s12_internal.h"
#include "m9s12_sci.h"
#include "m9s12_serial.h"
#ifdef CONFIG_HCS12_SERIALMON
# include "m9s12_flash.h"
#endif
/**************************************************************************
* Pre-processor Definitions
**************************************************************************/
#ifdef CONFIG_HCS12_NONBANKED
# define CALL jsr
# define RETURN rts
#else
# define CALL call
# define RETURN rtc
#endif
/* Select SCI parameters for the selected console */
#if defined(CONFIG_SCI0_SERIAL_CONSOLE)
# define HCS12_CONSOLE_BASE HCS12_SCI0_BASE
# define HCS12_CONSOLE_BAUD CONFIG_SCI0_BAUD
# define HCS12_CONSOLE_BITS CONFIG_SCI0_BITS
# define HCS12_CONSOLE_PARITY CONFIG_SCI0_PARITY
# define HCS12_CONSOLE_2STOP CONFIG_SCI0_2STOP
#elif defined(CONFIG_SCI1_SERIAL_CONSOLE)
# define HCS12_CONSOLE_BASE HCS12_SCI1_BASE
# define HCS12_CONSOLE_BAUD CONFIG_SCI1_BAUD
# define HCS12_CONSOLE_BITS CONFIG_SCI1_BITS
# define HCS12_CONSOLE_PARITY CONFIG_SCI1_PARITY
# define HCS12_CONSOLE_2STOP CONFIG_SCI1_2STOP
#else
# warning "No CONFIG_SCIn_SERIAL_CONSOLE Setting"
#endif
/* Selete the SCIBR register value */
#define CONSOLE_SCIBR_VALUE SCIBR_VALUE(HCS12_CONSOLE_BAUD)
/* Select the SCICR1 register settings */
#if HCS12_CONSOLE_BITS == 9
# define UART_SCICR1_NBITS SCI_CR1_M
#elif HCS12_CONSOLE_BITS == 8
# define UART_SCICR1_NBITS 0
#else
# warning "Number of bits not supported"
#endif
#if HCS12_CONSOLE_PARITY == 0
# define UART_SCICR1_PARITY 0
#elif HCS12_CONSOLE_PARITY == 1
# define UART_SCICR1_PARITY SCI_CR1_PE
#elif HCS12_CONSOLE_PARITY == 2
# define UART_SCICR1_PARITY (SCI_CR1_PE|SCI_CR1_PT)
#else
# error "ERROR: Invalid parity selection"
#endif
#if HCS12_CONSOLE_2STOP != 0
# warning "Only a single stop bit supported"
#endif
#define CONSOLE_SCICR_VALUE (UART_SCICR1_NBITS|UART_SCICR1_PARITY)
/**************************************************************************
* Private Types
**************************************************************************/
/**************************************************************************
* Private Function Prototypes
**************************************************************************/
/**************************************************************************
* Global Variables
**************************************************************************/
/**************************************************************************
* Private Variables
**************************************************************************/
/**************************************************************************
* Private Functions
**************************************************************************/
/**************************************************************************
* Public Functions
**************************************************************************/
/**************************************************************************
* Name: up_lowsetup
*
* Note: This function is called from the boot logic very early in the
* initialization sequence: After the stack pointer has been setup, but
* before .bss has been cleared and .data initialized.
*
**************************************************************************/
.text
.globl up_lowsetup
.type up_lowsetup, function
up_lowsetup:
#ifdef HAVE_SERIAL_CONSOLE
#ifndef CONFIG_HCS12_SERIALMON
/* Disable the console */
ldab #0
stab (HCS12_CONSOLE_BASE+HCS12_SCI_CR1_OFFSET)
stab (HCS12_CONSOLE_BASE+HCS12_SCI_CR2_OFFSET)
/* Set the BAUD pre-scaler value */
ldab #(CONSOLE_SCIBR_VALUE >> 8)
stab (HCS12_CONSOLE_BASE+HCS12_SCI_BDH_OFFSET)
ldab #(CONSOLE_SCIBR_VALUE & 0xff)
stab (HCS12_CONSOLE_BASE+HCS12_SCI_BDL_OFFSET)
/* Set number of bits, parity, stop bits, etc. */
ldab #CONSOLE_SCICR_VALUE
stab (HCS12_CONSOLE_BASE+HCS12_SCI_CR1_OFFSET)
/* Enable transmitter and receiver */
ldab #(SCI_CR2_RE|SCI_CR2_TE)
stab (HCS12_CONSOLE_BASE+HCS12_SCI_CR2_OFFSET)
#endif /* CONFIG_HCS12_SERIALMON */
#endif /* HAVE_SERIAL_CONSOLE */
RETURN
.size up_lowsetup, . - up_lowsetup
/**************************************************************************
* Name: up_lowputc
**************************************************************************/
.text
.global up_lowputc
.type up_lowputc, function
up_lowputc:
#ifdef HAVE_SERIAL_CONSOLE
#ifdef CONFIG_HCS12_SERIALMON
jmp PutChar
#else
#if HCS12_CONSOLE_BITS == 9
staa 1, -sp
#endif /* HCS12_CONSOLE_BITS == 9 */
/* Wait for the transmit data register to be available (TRDE==1) */
.Lwait:
ldaa (HCS12_CONSOLE_BASE+HCS12_SCI_SR1_OFFSET)
bita #SCI_SR1_TDRE
bne .Lwait
/* Then write the byte to the transmit data register */
#if HCS12_CONSOLE_BITS == 9
ldaa 1, sp+
bita #(0x01)
bne .L8bit
ldaa #SCI_DRH_T8
bra .Lwrdrh
.L8bit:
ldaa #0
.Lwrdrh:
staa (HCS12_CONSOLE_BASE+HCS12_SCI_DRH_OFFSET)
#endif /* HCS12_CONSOLE_BITS == 9 */
stab (HCS12_CONSOLE_BASE+HCS12_SCI_DRL_OFFSET)
RETURN
#endif /* !CONFIG_HCS12_SERIALMON */
#else
RETURN
#endif /* HAVE_SERIAL_CONSOLE */
.size up_lowputc, . - up_lowputc
.end
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