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sysinit_nxp_xpresso_1347.c
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1 /*
2 * @brief Xpresso 1347 Sysinit file
3 *
4 * @note
5 * Copyright(C) NXP Semiconductors, 2012
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 "board.h"
33 #include "string.h"
34
52 /*****************************************************************************
53 * Private types/enumerations/variables
54 ****************************************************************************/
55
56 /* IOCON pin definitions for pin muxing */
57 typedef struct {
58 uint32_t port:8; /* Pin port */
59 uint32_t pin:8; /* Pin number */
60 uint32_t modefunc:16; /* Pin mode */
61 } PINMUX_GRP_T;
62
63 /*****************************************************************************
64 * Public types/enumerations/variables
65 ****************************************************************************/
66
67 /* Pin muxing table, only items that need changing from their default pin
68 state are in this table. */
69 STATIC const PINMUX_GRP_T pinmuxing[] = {
70 {0, 1, (IOCON_FUNC1 | IOCON_MODE_INACT)}, /* PIO0_1 used for CLKOUT */
71 {0, 2, (IOCON_FUNC1 | IOCON_MODE_PULLUP)}, /* PIO0_2 used for SSEL */
72 {0, 3, (IOCON_FUNC1 | IOCON_MODE_INACT)}, /* PIO0_3 used for USB_VBUS */
73 {0, 4, (IOCON_FUNC1 | IOCON_SFI2C_EN)}, /* PIO0_4 used for SCL */
74 {0, 5, (IOCON_FUNC1 | IOCON_SFI2C_EN)}, /* PIO0_5 used for SDA */
75 {0, 6, (IOCON_FUNC1 | IOCON_MODE_INACT)}, /* PIO0_6 used for USB_CONNECT */
76 {0, 8, (IOCON_FUNC1 | IOCON_MODE_INACT)}, /* PIO0_8 used for MISO0 */
77 {0, 9, (IOCON_FUNC1 | IOCON_MODE_INACT)}, /* PIO0_9 used for MOSI0 */
78 {0, 11, (IOCON_FUNC1 | IOCON_ADMODE_EN | IOCON_FILT_DIS)},/* PIO0_11 used for AD0 */
79 {0, 18, (IOCON_FUNC1 | IOCON_MODE_INACT)}, /* PIO0_18 used for RXD */
80 {0, 19, (IOCON_FUNC1 | IOCON_MODE_INACT)}, /* PIO0_19 used for TXD */
81 {1, 29, (IOCON_FUNC1 | IOCON_MODE_INACT)}, /* PIO1_29 used for SCK0 */
82 };
83
84 /*****************************************************************************
85 * Private functions
86 ****************************************************************************/
87
88 /* Setup system clocking */
89 STATIC void SystemSetupClocking(void)
90 {
91 int i;
92
93 /* Powerup main oscillator */
94 Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_SYSOSC_PD);
95
96 /* Wait an estimated 200us for OSC to be stablized, no status
97 indication, dummy wait */
98 for (i = 0; i < 0x100; i++) {}
99
100 /* Set system PLL input to main oscillator */
101 Chip_Clock_SetSystemPllSource(SYSCTL_PLLCLKSRC_SYSOSC);
102
103 /* Powerup system PLL */
104 Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_SYSPLL_PD);
105
106 /* Setup PLL for main oscillator rate (FCLKIN = 12MHz) * 6 = 72MHz
107 MSEL = 5 (this is pre-decremented), PSEL = 1 (for P = 2)
108 FCLKOUT = FCLKIN * (MSEL + 1) = 12MHz * 6 = 72MHz
109 FCCO = FCLKOUT * 2 * P = 72MHz * 2 * 2 = 288MHz (within FCCO range) */
110 Chip_Clock_SetupSystemPLL(5, 1);
111
112 /* Wait for PLL to lock */
113 while (!Chip_Clock_IsSystemPLLLocked()) {}
114
115 /* Set system clock divider to 1 */
116 Chip_Clock_SetSysClockDiv(1);
117
118 /* Setup FLASH access to 3 clocks (72MHz clock) */
119 Chip_FMC_SetFLASHAccess(FLASHTIM_72MHZ_CPU);
120
121 /* Set main clock source to the system PLL. This will drive 72MHz
122 for the main clock and 72MHz for the system clock */
123 Chip_Clock_SetMainClockSource(SYSCTL_MAINCLKSRC_PLLOUT);
124
125 /* Enable IOCON clock */
126 Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_IOCON);
127 }
128
129 /* Sets up system pin muxing */
130 STATIC void SystemSetupMuxing(void)
131 {
132 int i;
133
134 for (i = 0; i < (sizeof(pinmuxing) / sizeof(PINMUX_GRP_T)); i++) {
135 Chip_IOCON_PinMuxSet(LPC_IOCON, pinmuxing[i].port, pinmuxing[i].pin,
136 pinmuxing[i].modefunc);
137 }
138 }
139
140 /*****************************************************************************
141 * Public functions
142 ****************************************************************************/
143
151 void SystemInit(void)
152 {
153 /* Booting from FLASH, so remap vector table to FLASH */
154 Chip_SYSCTL_Map(REMAP_USER_FLASH_MODE);
155
156 /* Setup system clocking and muxing */
157 SystemSetupClocking();
158 SystemSetupMuxing();
159 }