clkconfig.c

来自「CortexM0上移植UCOS-II」· C语言 代码 · 共 69 行

/****************************************************************************
 *   $Id:: clkconfig.c 4066 2010-07-30 02:21:56Z usb00423                   $
 *   Project: NXP LPC11xx Clock Configuration example
 *
 *   Description:
 *     This file contains clock configuration code example which include 
 *     watchdog setup and debug clock out setup.
 *
 ****************************************************************************
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * products. This software is supplied "AS IS" without any warranties.
 * NXP Semiconductors assumes no responsibility or liability for the
 * use of the software, conveys no license or title under any patent,
 * copyright, or mask work right to the product. NXP Semiconductors
 * reserves the right to make changes in the software without
 * notification. NXP Semiconductors also make no representation or
 * warranty that such application will be suitable for the specified
 * use without further testing or modification.
****************************************************************************/
#include "LPC11xx.h"
#include "clkconfig.h"
/*****************************************************************************
** Function name:		WDT_CLK_Setup
**
** Descriptions:		Configure WDT clock.
** parameters:			clock source: irc_osc(0), main_clk(1), wdt_osc(2).			 
** 						
** Returned value:		None
** 
*****************************************************************************/
void WDT_CLK_Setup ( uint32_t clksrc )
{
  /* Watchdog configuration. */
  /* Freq = 0.5Mhz, div_sel is 0, divided by 2. WDT_OSC should be 250khz */
  LPC_SYSCON->WDTOSCCTRL = (0x01<<5)|0x00;
  LPC_SYSCON->WDTCLKSEL  = clksrc;        /* Select clock source */
  LPC_SYSCON->WDTCLKUEN  = 0x01;          /* Update clock */
  LPC_SYSCON->WDTCLKUEN  = 0x00;          /* Toggle update register once */
  LPC_SYSCON->WDTCLKUEN  = 0x01;
  while ( !(LPC_SYSCON->WDTCLKUEN & 0x01) );  /* Wait until updated */
  LPC_SYSCON->WDTCLKDIV  = 1;            /* Divided by 1 */  
  LPC_SYSCON->PDRUNCFG &= ~(0x1<<6);    /* Let WDT clock run */
  return;
}

/*****************************************************************************
** Function name:		CLKOUT_Setup
**
** Descriptions:		Configure CLKOUT for reference clock check.
** parameters:			clock source: irc_osc(0), sys_osc(1), wdt_osc(2),
**						main_clk(3).			 
** 						
** Returned value:		None
** 
*****************************************************************************/
void CLKOUT_Setup ( uint32_t clksrc )
{
  /* debug PLL after configuration. */
  LPC_SYSCON->CLKOUTCLKSEL = clksrc;	/* Select Main clock */
  LPC_SYSCON->CLKOUTUEN = 0x01;		/* Update clock */
  LPC_SYSCON->CLKOUTUEN = 0x00;		/* Toggle update register once */
  LPC_SYSCON->CLKOUTUEN = 0x01;
  while ( !(LPC_SYSCON->CLKOUTUEN & 0x01) );		/* Wait until updated */
  LPC_SYSCON->CLKOUTDIV = 1;			/* Divided by 1 */
  return;
}