62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
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/******************************************************************************
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* clkconfig.c: clock configuration C file for NXP LPC13xx Family
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* Microprocessors
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*
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* Copyright(C) 2009, NXP Semiconductor
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* All rights reserved.
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*
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* History
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* 2009.08.20 ver 1.00 Preliminary version, first Release
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*
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******************************************************************************/
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#include "LPC13xx.h"
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#include "clkconfig.h"
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/*****************************************************************************
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** Function name: WDT_CLK_Setup
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**
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** Descriptions: Configure WDT clock.
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** parameters: clock source: irc_osc(0), main_clk(1), wdt_osc(2).
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**
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** Returned value: None
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**
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*****************************************************************************/
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void
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WDT_CLK_Setup (uint32_t clksrc)
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{
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/* Watchdog configuration. */
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/* Freq = 0.5Mhz, div_sel is 0, divided by 2. WDT_OSC should be 250khz */
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LPC_SYSCON->WDTOSCCTRL = (0x1 << 5) | 0x00;
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LPC_SYSCON->WDTCLKSEL = clksrc; /* Select clock source */
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LPC_SYSCON->WDTCLKUEN = 0x01; /* Update clock */
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LPC_SYSCON->WDTCLKUEN = 0x00; /* Toggle update register once */
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LPC_SYSCON->WDTCLKUEN = 0x01;
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while (!(LPC_SYSCON->WDTCLKUEN & 0x01)); /* Wait until updated */
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LPC_SYSCON->WDTCLKDIV = 1; /* Divided by 1 */
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LPC_SYSCON->PDRUNCFG &= ~(0x1 << 6); /* Let WDT clock run */
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return;
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}
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/*****************************************************************************
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** Function name: CLKOUT_Setup
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**
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** Descriptions: Configure CLKOUT for reference clock check.
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** parameters: clock source: irc_osc(0), sys_osc(1), wdt_osc(2),
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** main_clk(3).
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**
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** Returned value: None
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**
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*****************************************************************************/
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void
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CLKOUT_Setup (uint32_t clksrc)
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{
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/* debug PLL after configuration. */
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LPC_SYSCON->CLKOUTCLKSEL = clksrc; /* Select Main clock */
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LPC_SYSCON->CLKOUTUEN = 0x01; /* Update clock */
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LPC_SYSCON->CLKOUTUEN = 0x00; /* Toggle update register once */
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LPC_SYSCON->CLKOUTUEN = 0x01;
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while (!(LPC_SYSCON->CLKOUTUEN & 0x01)); /* Wait until updated */
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LPC_SYSCON->CLKOUTDIV = 1; /* Divided by 1 */
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return;
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}
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