FreeRTOS/Demo/NEC_V850ES_IAR/LowLevelInit/LowLevelInit.c

/*
 * FreeRTOS Kernel V10.3.0
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * http://www.FreeRTOS.org
 * http://aws.amazon.com/freertos
 *
 * 1 tab == 4 spaces!
 */

#include "FreeRTOS.h"

/*-----------------------------------------------------------*/

/* Called by the startup code to initialise the run time system. */
unsigned char __low_level_init(void);

/*-----------------------------------------------------------*/

unsigned char __low_level_init(void)
{
unsigned char resetflag = RESF;
unsigned char psval = 0;
unsigned portBASE_TYPE i = 0;        

	/* Setup provided by NEC. */

	portDISABLE_INTERRUPTS();         /* disable global interrupts */                      

	PRCMD = 0x00;                     /* On-chip debug mode */
	OCDM = 0x00;
	VSWC = 0x00;                      /* set system wait control register */
	WDTM2 = 0x00;                     /* WDT2 setting */
	PLLON = 0;                        /* PLL stop mode */
	psval = 0x0A | 0x00;
	PRCMD = psval;                    /* set Command Register */
	CKC = psval;                      /* set Clock Control Register */
	PLLS = 0x03;
	psval = 0x80;                     /* Set fXX and fCPU */
	PRCMD = psval;
	PCC = psval;
	PLLON = 1;                        /* activate PLL */
	for( i = 0; i <= 2000; i++ )      /* Wait for stabilisation */
	{
	portNOP();
	}
	while( LOCK )                     /* Wait for PLL frequency stabiliasation */
	{
	;
	}
	SELPLL = 1;                       /* Set PLL mode active */
	RSTOP = 0;                        /* Set fR (enable) */
	BGCE0 = 0;                        /* Set fBRG(disable) */
	psval = 0x00;                     /* Stand-by setting */
	PRCMD = psval;                    /* set Command Register */
	PSC = psval;                      /* set Power Save Control Register */

	return pdTRUE;
}
/*-----------------------------------------------------------*/