111 lines
4.3 KiB
Plaintext
111 lines
4.3 KiB
Plaintext
/*
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* @brief LPC17xx/40xx Miscellaneous chip specific functions
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*
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* @note
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* Copyright(C) NXP Semiconductors, 2014
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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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/* Sets up USB PLL, all needed clocks and enables USB PHY on the chip. USB pins which are
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muxed to different pads are not initialized here. This routine assumes that the XTAL
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OSC is enabled and running prior to this call. */
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void Chip_USB_Init(void)
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{
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#if defined(CHIP_LPC175X_6X)
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/* Setup USB PLL1 for a 48MHz clock
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Input clock rate (FIN) is main oscillator = 12MHz
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PLL1 Output = USBCLK = 48MHz = FIN * MSEL, so MSEL = 4.
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FCCO = USBCLK = USBCLK * 2 * P. It must be between 156 MHz to 320 MHz.
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so P = 2 and FCCO = 48MHz * 2 * 2 = 192MHz */
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Chip_Clock_SetupPLL(SYSCTL_USB_PLL, 3, 1); /* Multiply by 4, Divide by 2 */
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/* Use PLL1 output as USB Clock Source */
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/* Enable PLL1 */
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Chip_Clock_EnablePLL(SYSCTL_USB_PLL, SYSCTL_PLL_ENABLE);
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/* Wait for PLL1 to lock */
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while (!Chip_Clock_IsUSBPLLLocked()) {}
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/* Connect PLL1 */
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Chip_Clock_EnablePLL(SYSCTL_USB_PLL, SYSCTL_PLL_ENABLE | SYSCTL_PLL_CONNECT);
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/* Wait for PLL1 to be connected */
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while (!Chip_Clock_IsUSBPLLConnected()) {}
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#else
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/* Select XTAL as clock source for USB block and divider as 1 */
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LPC_SYSCTL->USBCLKSEL = 0x1;
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/* Setup USB PLL1 for a 48MHz clock
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Input clock rate (FIN) is main oscillator = 12MHz
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PLL output = 48MHz = FIN * MSEL, so MSEL = 4
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FCCO must be between 156 MHz to 320 MHz, where FCCO = PLL output * 2 * P,
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so P = 2 and FCCO = 48MHz * 2 * 2 = 192MHz */
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Chip_Clock_SetupPLL(SYSCTL_USB_PLL, 3, 1);
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/* Wait for USB PLL to lock */
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while ((Chip_Clock_GetPLLStatus(SYSCTL_USB_PLL) & SYSCTL_PLLSTS_LOCKED) == 0) {}
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/* Select PLL1/USBPLL as clock source for USB block and divider as 1 */
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LPC_SYSCTL->USBCLKSEL = (SYSCTL_USBCLKSRC_USBPLL << 8) | 0x01;
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#endif /* defined(CHIP_LPC175X_6X) */
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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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}
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