206 lines
6.5 KiB
ArmAsm
Executable File
206 lines
6.5 KiB
ArmAsm
Executable File
/**************************************************************************
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* arch/arm/src/m9s12/m9s12_lowputc.S
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*
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* Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 "up_internal.h"
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#include "m9s12_internal.h"
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#include "m9s12_sci.h"
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#include "m9s12_serial.h"
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#ifdef CONFIG_HCS12_SERIALMON
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# include "m9s12_flash.h"
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#endif
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/**************************************************************************
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* Private Definitions
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**************************************************************************/
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/* Select SCI parameters for the selected console */
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#if defined(CONFIG_SCI0_SERIAL_CONSOLE)
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# define HCS12_CONSOLE_BASE HCS12_SCI0_BASE
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# define HCS12_CONSOLE_BAUD CONFIG_SCI0_BAUD
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# define HCS12_CONSOLE_BITS CONFIG_SCI0_BITS
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# define HCS12_CONSOLE_PARITY CONFIG_SCI0_PARITY
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# define HCS12_CONSOLE_2STOP CONFIG_SCI0_2STOP
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#elif defined(CONFIG_SCI1_SERIAL_CONSOLE)
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# define HCS12_CONSOLE_BASE HCS12_SCI1_BASE
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# define HCS12_CONSOLE_BAUD CONFIG_SCI1_BAUD
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# define HCS12_CONSOLE_BITS CONFIG_SCI1_BITS
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# define HCS12_CONSOLE_PARITY CONFIG_SCI1_PARITY
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# define HCS12_CONSOLE_2STOP CONFIG_SCI1_2STOP
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#else
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# warning "No CONFIG_SCIn_SERIAL_CONSOLE Setting"
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#endif
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/* Selete the SCIBR register value */
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#define CONSOLE_SCIBR_VALUE SCIBR_VALUE(HCS12_CONSOLE_BAUD)
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/* Select the SCICR1 register settings */
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#if HCS12_CONSOLE_BITS == 9
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# define UART_SCICR1_NBITS SCI_CR1_M
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#elif HCS12_CONSOLE_BITS == 8
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# define UART_SCICR1_NBITS 0
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#else
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# warning "Number of bits not supported"
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#endif
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#if HCS12_CONSOLE_PARITY == 0
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# define UART_SCICR1_PARITY 0
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#elif HCS12_CONSOLE_PARITY == 1
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# define UART_SCICR1_PARITY SCI_CR1_PE
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#elif HCS12_CONSOLE_PARITY == 2
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# define UART_SCICR1_PARITY (SCI_CR1_PE|SCI_CR1_PT)
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#else
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# error "ERROR: Invalid parity selection"
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#endif
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#if HCS12_CONSOLE_2STOP != 0
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# warning "Only a single stop bit supported"
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#endif
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#define CONSOLE_SCICR_VALUE (UART_SCICR1_NBITS|UART_SCICR1_PARITY)
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/**************************************************************************
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* Private Types
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**************************************************************************/
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/**************************************************************************
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* Private Function Prototypes
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**************************************************************************/
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/**************************************************************************
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* Global Variables
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**************************************************************************/
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/**************************************************************************
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* Private Variables
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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: up_lowsetup
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**************************************************************************/
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.text
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.globl up_lowsetup
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.type up_lowsetup, function
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up_lowsetup:
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#ifdef CONFIG_HCS12_SERIALMON
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rts
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#else
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/* Disable the console */
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ldab #0
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stab (HCS12_CONSOLE_BASE+HCS12_SCI_CR1_OFFSET)
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stab (HCS12_CONSOLE_BASE+HCS12_SCI_CR2_OFFSET)
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/* Set the BAUD pre-scaler value */
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ldab #(CONSOLE_SCIBR_VALUE >> 8)
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stab (HCS12_CONSOLE_BASE+HCS12_SCI_BDH_OFFSET)
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ldab #(CONSOLE_SCIBR_VALUE & 0xff)
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stab (HCS12_CONSOLE_BASE+HCS12_SCI_BDL_OFFSET)
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/* Set number of bits, parity, stop bits, etc. */
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ldab #CONSOLE_SCICR_VALUE
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stab (HCS12_CONSOLE_BASE+HCS12_SCI_CR1_OFFSET)
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/* Enable transmitter and receiver */
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ldab #(SCI_CR2_RE|SCI_CR2_TE)
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stab (HCS12_CONSOLE_BASE+HCS12_SCI_CR2_OFFSET)
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rts
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#endif
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.size up_lowsetup, . - up_lowsetup
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/**************************************************************************
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* Name: up_lowputc
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**************************************************************************/
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.text
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.global up_lowputc
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.type up_lowputc, function
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up_lowputc:
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#ifdef CONFIG_HCS12_SERIALMON
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jmp PutChar
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#else
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# if HCS12_CONSOLE_BITS == 9
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staa 1, -sp
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# endif
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/* Wait for the transmit data register to be available (TRDE==1) */
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.Lwait:
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ldaa (HCS12_CONSOLE_BASE+HCS12_SCI_SR1_OFFSET)
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bita #SCI_SR1_TDRE
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bne .Lwait
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/* Then write the byte to the transmit data register */
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# if HCS12_CONSOLE_BITS == 9
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ldaa 1, sp+
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bita #(0x01)
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bne .L8bit
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ldaa #SCI_DRH_T8
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bra .Lwrdrh
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.L8bit:
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ldaa #0
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.Lwrdrh:
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staa (HCS12_CONSOLE_BASE+HCS12_SCI_DRH_OFFSET)
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# endif
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stab (HCS12_CONSOLE_BASE+HCS12_SCI_DRL_OFFSET)
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rts
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#endif
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.size up_lowputc, . - up_lowputc
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.end
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