Diff: KEIL_LPC11U_COMMON_LIB/clkconfig.c

Revision:

1:0f1be4e75668

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/KEIL_LPC11U_COMMON_LIB/clkconfig.c	Mon May 28 00:13:23 2012 +0000
@@ -0,0 +1,76 @@
+/****************************************************************************
+ *   $Id:: clkconfig.c 9190 2012-02-16 20:59:45Z nxp41306                   $
+ *   Project: NXP LPC11Uxx 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.
+
+* Permission to use, copy, modify, and distribute this software and its 
+* documentation is hereby granted, under NXP Semiconductors' 
+* relevant copyright in the software, without fee, provided that it 
+* is used in conjunction with NXP Semiconductors microcontrollers.  This 
+* copyright, permission, and disclaimer notice must appear in all copies of 
+* this code.
+
+****************************************************************************/
+
+#include "LPC11Uxx.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 )
+{
+  /* Freq = 0.5Mhz, div_sel is 0x1F, divided by 64. WDT_OSC should be 7.8125khz */
+  LPC_SYSCON->WDTOSCCTRL = (0x1<<5)|0x1F;
+  LPC_SYSCON->PDRUNCFG &= ~(0x1<<6);    /* Let WDT clock run */
+
+  /* Enables clock for WDT */
+  LPC_SYSCON->SYSAHBCLKCTRL |= (1<<15);
+  LPC_WWDT->CLKSEL = clksrc;        /* Select clock source */
+  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->CLKOUTSEL = 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;
+}
+