clock.c

/*
 * clock.c
 *
 * Created on: May 31, 2014
 *     Author: Ekawahyu Susilo
 *
 * Copyright (c) 2014, Chongqing Aisenke Electronic Technology Co., Ltd.
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER 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 HOLDER 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.
 *
 * The views and conclusions contained in the software and documentation are
 * those of the authors and should not be interpreted as representing official
 * policies, either expressed or implied, of the copyright holder.
 *
 */

#include "compiler.h"
#include "cc253x.h"
#include "sfr-bits.h"
#include "clock.h"

void clock_init(void)
{
  /* Make sure we know where we stand */
  CLKCONCMD = CLKCONCMD_OSC32K | CLKCONCMD_OSC;
  while(!(CLKCONSTA & CLKCONCMD_OSC));

  /* Stay with 32 KHz RC OSC, change system clock to 32 MHz */
  CLKCONCMD &= ~CLKCONCMD_OSC;
  while(CLKCONSTA & CLKCONCMD_OSC);
}

void clock_delay_usec(uint16_t len)
{
  while(len--) {
    __asm_begin
      ASM(nop)
    __asm_end;
  }
}