1 /*
2 * @brief LPC15xx Miscellaneous chip specific functions
3 *
4 * @note
5 * Copyright(C) NXP Semiconductors, 2013
6 * All rights reserved.
7 *
8 * @par
9 * Software that is described herein is for illustrative purposes only
10 * which provides customers with programming information regarding the
11 * LPC products. This software is supplied "AS IS" without any warranties of
12 * any kind, and NXP Semiconductors and its licensor disclaim any and
13 * all warranties, express or implied, including all implied warranties of
14 * merchantability, fitness for a particular purpose and non-infringement of
15 * intellectual property rights. NXP Semiconductors assumes no responsibility
16 * or liability for the use of the software, conveys no license or rights under any
17 * patent, copyright, mask work right, or any other intellectual property rights in
18 * or to any products. NXP Semiconductors reserves the right to make changes
19 * in the software without notification. NXP Semiconductors also makes no
20 * representation or warranty that such application will be suitable for the
21 * specified use without further testing or modification.
22 *
23 * @par
24 * Permission to use, copy, modify, and distribute this software and its
25 * documentation is hereby granted, under NXP Semiconductors' and its
26 * licensor's relevant copyrights in the software, without fee, provided that it
27 * is used in conjunction with NXP Semiconductors microcontrollers. This
28 * copyright, permission, and disclaimer notice must appear in all copies of
29 * this code.
30 */
31
32 #include "chip.h"
33
34 /*****************************************************************************
35 * Private types/enumerations/variables
36 ****************************************************************************/
37
38 /*****************************************************************************
39 * Public types/enumerations/variables
40 ****************************************************************************/
41
42 /* System Clock Frequency (Core Clock) */
43 uint32_t SystemCoreClock;
44
45 /*****************************************************************************
46 * Private functions
47 ****************************************************************************/
48
49 /*****************************************************************************
50 * Public functions
51 ****************************************************************************/
52
53 /* Update system core clock rate, should be called if the system has
54 a clock rate change */
SystemCoreClockUpdate(void)55 void SystemCoreClockUpdate(void)
56 {
57 /* CPU core speed */
58 SystemCoreClock = Chip_Clock_GetSystemClockRate();
59 }
60
Chip_USB_Init(void)61 void Chip_USB_Init(void)
62 {
63 /* Set USB PLL input to main oscillator */
64 Chip_Clock_SetUSBPLLSource(SYSCTL_PLLCLKSRC_MAINOSC);
65 /* Setup USB PLL (FCLKIN = 12MHz) * 4 = 48MHz
66 MSEL = 3 (this is pre-decremented), PSEL = 1 (for P = 2)
67 FCLKOUT = FCLKIN * (MSEL + 1) = 12MHz * 4 = 48MHz
68 FCCO = FCLKOUT * 2 * P = 48MHz * 2 * 2 = 192MHz (within FCCO range) */
69 Chip_Clock_SetupUSBPLL(3, 1);
70
71 /* Powerup USB PLL */
72 Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_USBPLL_PD);
73
74 /* Wait for PLL to lock */
75 while (!Chip_Clock_IsUSBPLLLocked()) {}
76
77 /* enable USB main clock */
78 Chip_Clock_SetUSBClockSource(SYSCTL_USBCLKSRC_PLLOUT, 1);
79 /* Enable AHB clock to the USB block. */
80 Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_USB);
81 /* power UP USB Phy */
82 Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_USBPHY_PD);
83 /* Reset USB block */
84 Chip_SYSCTL_PeriphReset(RESET_USB);
85 }
86