85 lines
3.4 KiB
C
85 lines
3.4 KiB
C
/*
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* @brief LPC11u6x Miscellaneous chip specific functions
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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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/* System Clock Frequency (Core Clock) */
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uint32_t SystemCoreClock;
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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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/* Update system core clock rate, should be called if the system has
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a clock rate change */
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void SystemCoreClockUpdate(void)
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{
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/* CPU core speed */
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SystemCoreClock = Chip_Clock_GetSystemClockRate();
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}
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void Chip_USB_Init(void)
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{
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/* Set USB PLL input to main oscillator */
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Chip_Clock_SetUSBPLLSource(SYSCTL_USBPLLCLKSRC_MAINOSC);
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/* Setup USB PLL (FCLKIN = 12MHz) * 4 = 48MHz
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MSEL = 3 (this is pre-decremented), PSEL = 1 (for P = 2)
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FCLKOUT = FCLKIN * (MSEL + 1) = 12MHz * 4 = 48MHz
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FCCO = FCLKOUT * 2 * P = 48MHz * 2 * 2 = 192MHz (within FCCO range) */
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Chip_Clock_SetupUSBPLL(3, 1);
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/* Powerup USB PLL */
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Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_USBPLL_PD);
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/* Wait for PLL to lock */
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while (!Chip_Clock_IsUSBPLLLocked()) {}
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/* enable USB main clock */
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Chip_Clock_SetUSBClockSource(SYSCTL_USBCLKSRC_PLLOUT, 1);
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/* Enable AHB clock to the USB block and USB RAM. */
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_USB);
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Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_USBRAM);
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/* power UP USB Phy */
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Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_USBPAD_PD);
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}
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