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/**************************************************************************
* arch/avr/src/at90usb/at90usb_lowinit.c
*
* Copyright (C) 2011-2012 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 <avr/wdt.h>
#include <avr/power.h>
#include "at90usb_config.h"
#include "up_internal.h"
#include "at90usb_internal.h"
/**************************************************************************
* Private Definitions
**************************************************************************/
#if defined(CONFIG_WDTO_15MS)
# define WDTO_VALUE WDTO_15MS
#elif defined(CONFIG_WDTO_30MS)
# define WDTO_VALUE WDTO_30MS
#elif defined(CONFIG_WDTO_60MS)
# define WDTO_VALUE WDTO_60MS
#elif defined(CONFIG_WDTO_120MS)
# define WDTO_VALUE WDTO_120MS
#elif defined(CONFIG_WDTO_1250MS)
# define WDTO_VALUE WDTO_250MS
#elif defined(CONFIG_WDTO_500MS)
# define WDTO_VALUE WDTO_500MS
#elif defined(CONFIG_WDTO_1S)
# define WDTO_VALUE WDTO_1S
#elif defined(CONFIG_WDTO_2S)
# define WDTO_VALUE WDTO_2S
#elif defined(CONFIG_WDTO_4S)
# define WDTO_VALUE WDTO_4S
#else /* if defined(CONFIG_WDTO_8S) */
# define WDTO_VALUE WDTO_8S
#endif
/**************************************************************************
* Private Types
**************************************************************************/
/**************************************************************************
* Private Function Prototypes
**************************************************************************/
/**************************************************************************
* Global Variables
**************************************************************************/
/**************************************************************************
* Private Variables
**************************************************************************/
/**************************************************************************
* Private Functions
**************************************************************************/
/**************************************************************************
* Name: up_wdtinit
*
* Description:
* Initialize the watchdog per the NuttX configuration.
*
**************************************************************************/
static inline void up_wdtinit(void)
{
#ifdef CONFIG_AVR_WDT
wdt_enable(WDTO_VALUE);
#endif
}
/**************************************************************************
* Public Functions
**************************************************************************/
/**************************************************************************
* Name: up_lowinit
*
* Description:
* This performs basic initialization of the USART used for the serial
* console. Its purpose is to get the console output availabe as soon
* as possible.
*
**************************************************************************/
void up_lowinit(void)
{
/* Disable the watchdog timer */
wdt_disable();
/* Set the system clock divider to 1 */
clock_prescale_set(clock_div_1);
/* Initialize the watchdog timer */
up_wdtinit();
/* Initialize a console (probably a serial console) */
up_consoleinit();
/* Perform early serial initialization (so that we will have debug output
* available as soon as possible).
*/
#ifdef USE_EARLYSERIALINIT
up_earlyserialinit();
#endif
/* Perform board-level initialization */
up_boardinitialize();
}
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