116 lines
4.4 KiB
C
116 lines
4.4 KiB
C
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/*
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* @brief LPC8xx 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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#define _CHIP_COMMON_
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#include "board_lpc.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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#define CONFIG_MAIN_FREQ 60000000
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#define CONFIG_SYS_FREQ MAX_CLOCK_FREQ
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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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/* EXT oscillator < 15MHz */
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Chip_Clock_SetPLLBypass(false, false);
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/* Turn on the SYSOSC by clearing the power down bit */
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Chip_SYSCTL_PowerUp(SYSCTL_SLPWAKE_SYSOSC_PD);
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/* Select the PLL input to the external oscillator */
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Chip_Clock_SetSystemPLLSource(SYSCTL_PLLCLKSRC_SYSOSC);
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/* Setup FLASH access to 2 clocks (up to 30MHz) */
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Chip_FMC_SetFLASHAccess(FLASHTIM_30MHZ_CPU);
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/* Power down PLL to change the PLL divider ratio */
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Chip_SYSCTL_PowerDown(SYSCTL_SLPWAKE_SYSPLL_PD);
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/* Configure the PLL M and P dividers */
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/* Setup PLL for main oscillator rate ((FCLKIN = 12MHz) * 5)/2 = 30MHz */
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Chip_Clock_SetupSystemPLL(4, 1);
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/* Turn on the PLL by clearing the power down bit */
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Chip_SYSCTL_PowerUp(SYSCTL_SLPWAKE_SYSPLL_PD);
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/* Enable the clock to the Switch Matrix */
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_SWM);
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/* Wait for PLL to lock */
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while (!Chip_Clock_IsSystemPLLLocked()) {}
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Chip_Clock_SetSysClockDiv(2);
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/* Set main clock source to the system PLL. This will drive 24MHz
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for the main clock and 24MHz 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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Chip_IRC_SetFreq(CONFIG_MAIN_FREQ, CONFIG_SYS_FREQ);
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}
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/* Set up and initialize hardware prior to call to main */
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/* <20><>main()<29><><EFBFBD><EFBFBD>֮ǰ<D6AE><C7B0><EFBFBD>ô˺<C3B4><CBBA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
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void SystemInit(void)
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{
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_IOCON);
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#ifdef USE_IRC_AS_ROOT_CLOCK
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/* Use 12MHz IRC as clock source */
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Chip_SetupIrcClocking();
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#else
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/* Use Xtal or external clock_in as clock source*/
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_SWM);
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Chip_SWM_EnableFixedPin(SWM_FIXED_XTALIN);
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Chip_SWM_EnableFixedPin(SWM_FIXED_XTALOUT);
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// Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_SWM);
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Chip_IOCON_PinSetMode(LPC_IOCON, IOCON_PIO8, PIN_MODE_INACTIVE);
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Chip_IOCON_PinSetMode(LPC_IOCON, IOCON_PIO9, PIN_MODE_INACTIVE);
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Chip_SetupXtalClocking();
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#endif
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}
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