133 lines
4.8 KiB
C
133 lines
4.8 KiB
C
/*
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* @brief LPC13xx Chip specific SystemInit
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2013
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* All rights reserved.
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*
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* @par
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* LPC products. This software is supplied "AS IS" without any warranties of
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* any kind, and NXP Semiconductors and its licensor disclaim any and
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* all warranties, express or implied, including all implied warranties of
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* merchantability, fitness for a particular purpose and non-infringement of
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* intellectual property rights. NXP Semiconductors assumes no responsibility
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* or liability for the use of the software, conveys no license or rights under any
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* patent, copyright, mask work right, or any other intellectual property rights in
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* or to any products. NXP Semiconductors reserves the right to make changes
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* in the software without notification. NXP Semiconductors also makes no
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* representation or warranty that such application will be suitable for the
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* specified use without further testing or modification.
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*
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* @par
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors' and its
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* licensor's relevant copyrights in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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*/
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#include "chip.h"
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/*****************************************************************************
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* Private types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Public types/enumerations/variables
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****************************************************************************/
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/*****************************************************************************
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* Private functions
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****************************************************************************/
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/*****************************************************************************
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* Public functions
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****************************************************************************/
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/* Setup system clocking */
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void Chip_SetupXtalClocking(void)
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{
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volatile int i;
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/* Powerup main oscillator */
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Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_SYSOSC_PD);
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/* Wait an estimated 200us for OSC to be stablized, no status
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indication, dummy wait */
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for (i = 0; i < 0x200; i++) {}
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/* Set system PLL input to main oscillator */
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Chip_Clock_SetSystemPLLSource(SYSCTL_PLLCLKSRC_SYSOSC);
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/* Power down PLL to change the PLL divider ratio */
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Chip_SYSCTL_PowerDown(SYSCTL_POWERDOWN_SYSPLL_PD);
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/* Setup PLL for main oscillator rate (FCLKIN = 12MHz) * 6 = 72MHz
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MSEL = 5 (this is pre-decremented), PSEL = 1 (for P = 2)
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FCLKOUT = FCLKIN * (MSEL + 1) = 12MHz * 6 = 72MHz
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FCCO = FCLKOUT * 2 * P = 72MHz * 2 * 2 = 288MHz (within FCCO range) */
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Chip_Clock_SetupSystemPLL(5, 1);
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/* Powerup system PLL */
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Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_SYSPLL_PD);
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/* Wait for PLL to lock */
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while (!Chip_Clock_IsSystemPLLLocked()) {}
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/* Set system clock divider to 1 */
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Chip_Clock_SetSysClockDiv(1);
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/* Setup FLASH access to 3 clocks (72MHz clock) */
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Chip_FMC_SetFLASHAccess(FLASHTIM_72MHZ_CPU);
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/* Set main clock source to the system PLL. This will drive 72MHz
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for the main clock and 72MHz for the system clock */
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Chip_Clock_SetMainClockSource(SYSCTL_MAINCLKSRC_PLLOUT);
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}
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/* Set up and initialize hardware prior to call to main */
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void Chip_SetupIrcClocking(void)
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{
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/* IRC should be powered up */
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Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_IRC_PD);
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Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_IRCOUT_PD);
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/* Set system PLL input to main oscillator */
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Chip_Clock_SetSystemPLLSource(SYSCTL_PLLCLKSRC_IRC);
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/* Power down PLL to change the PLL divider ratio */
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Chip_SYSCTL_PowerDown(SYSCTL_POWERDOWN_SYSPLL_PD);
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/* Setup PLL for main oscillator rate (FCLKIN = 12MHz) * 6 = 72MHz
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MSEL = 5 (this is pre-decremented), PSEL = 1 (for P = 2)
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FCLKOUT = FCLKIN * (MSEL + 1) = 12MHz * 6 = 72MHz
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FCCO = FCLKOUT * 2 * P = 72MHz * 2 * 2 = 288MHz (within FCCO range) */
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Chip_Clock_SetupSystemPLL(5, 1);
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/* Powerup system PLL */
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Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_SYSPLL_PD);
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/* Wait for PLL to lock */
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while (!Chip_Clock_IsSystemPLLLocked()) {}
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/* Set system clock divider to 1 */
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Chip_Clock_SetSysClockDiv(1);
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/* Setup FLASH access to 3 clocks */
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Chip_FMC_SetFLASHAccess(FLASHTIM_72MHZ_CPU);
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/* Set main clock source to the system PLL. This will drive 48MHz
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for the main clock and 48MHz for the system clock */
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Chip_Clock_SetMainClockSource(SYSCTL_MAINCLKSRC_PLLOUT);
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}
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/* Set up and initialize hardware prior to call to main */
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void Chip_SystemInit(void)
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{
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/* Initial internal clocking */
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Chip_SetupIrcClocking();
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}
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