FreeRTOS-Kernel/Demo/HCS12_GCC_banked/startup.c

/*
	FreeRTOS V5.4.1 - Copyright (C) 2009 Real Time Engineers Ltd.

	This file is part of the FreeRTOS distribution.

	FreeRTOS is free software; you can redistribute it and/or modify it	under 
	the terms of the GNU General Public License (version 2) as published by the 
	Free Software Foundation and modified by the FreeRTOS exception.
	**NOTE** The exception to the GPL is included to allow you to distribute a
	combined work that includes FreeRTOS without being obliged to provide the 
	source code for proprietary components outside of the FreeRTOS kernel.  
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	request.  See the licensing section of http://www.FreeRTOS.org for full 
	license details.

	FreeRTOS is distributed in the hope that it will be useful,	but WITHOUT
	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
	more details.

	You should have received a copy of the GNU General Public License along
	with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
	Temple Place, Suite 330, Boston, MA  02111-1307  USA.


	***************************************************************************
	*                                                                         *
	* Looking for a quick start?  Then check out the FreeRTOS eBook!          *
	* See http://www.FreeRTOS.org/Documentation for details                   *
	*                                                                         *
	***************************************************************************

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	Please ensure to read the configuration and relevant port sections of the
	online documentation.

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*/


/*
 * startup.c
 * Author Jefferson L Smith, Robotronics Inc.
 *
 * __premain() is the startup code to init hardware and ram to execute the
 *             C application.
 *
 */

#include <sys/ports.h>
#include "cpu.h"

void ATTR_NEAR __premain (void);

void
__premain (void)
{
	// in case special mode enabled, avoid conflict on PORTE
	PEAR |= NECLK;
	// bgnd mode stops COP and RTI clocks
	COPCTL = RSBCK;
	// stops TCNT counter when debugging stops
	TSCR1 |= (1<<5);			// TFRZ
	
	// PLL
	CLKSEL = 0;				// disable PLL to configure
	// xtal 16MHz, bus 24MHz
	SYNR  = 3 - 1;
	REFDV = 2 - 1;
	while (!(CRGFLG & 0x08))    // wait for PLL LOCK
	cop_optional_reset();
	CLKSEL |= 0x80;             // use PLL

	// init switch inputs
	PERH = 0xff;				// pullups

	// outputs
#if PORT_LED==M6811_PORTB		//PORTB
	DDRB = 0xff;	// init LED
#elif PORT_LED==M6811_PORTA		//PORTA
	DDRA = 0xff;
#elif PORT_LED==M6811_PTT	//PTT
	DDRT = 0xff;
#elif PORT_LED==M6811_PTM	//PTM
	DDRM = 0xff;
#elif PORT_LED==M6811_PTP	//PTP
	DDRP = 0xff;
#elif PORT_LED==M6811_PTH	//PTH
	DDRH = 0xff;
#endif
	
}