sysinit_nxp_xpresso_1769.c

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/*
 * @brief NXP LPC1769 Xpresso Sysinit file
 *
 * @note
 * Copyright(C) NXP Semiconductors, 2012
 * All rights reserved.
 *
 * @par
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * LPC products.  This software is supplied "AS IS" without any warranties of
 * any kind, and NXP Semiconductors and its licensor disclaim any and
 * all warranties, express or implied, including all implied warranties of
 * merchantability, fitness for a particular purpose and non-infringement of
 * intellectual property rights.  NXP Semiconductors assumes no responsibility
 * or liability for the use of the software, conveys no license or rights under any
 * patent, copyright, mask work right, or any other intellectual property rights in
 * or to any products. NXP Semiconductors reserves the right to make changes
 * in the software without notification. NXP Semiconductors also makes no
 * representation or warranty that such application will be suitable for the
 * specified use without further testing or modification.
 *
 * @par
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, under NXP Semiconductors' and its
 * licensor's relevant copyrights in the software, without fee, provided that it
 * is used in conjunction with NXP Semiconductors microcontrollers.  This
 * copyright, permission, and disclaimer notice must appear in all copies of
 * this code.
 */

 #include "board.h"
 #include "string.h"

/*****************************************************************************
 * Private types/enumerations/variables
 ****************************************************************************/

/* SCR pin definitions for pin muxing */
typedef struct {
 uint8_t pingrp;  /* Pin group */
 uint8_t pinnum;  /* Pin number */
 uint8_t pincfg;  /* Pin configuration for SCU */
 uint8_t funcnum; /* Function number */
} PINMUX_GRP_T;

/* Pin muxing configuration */
STATIC const PINMUX_GRP_T pinmuxing[] = {
 {0,  0,   IOCON_MODE_INACT,                   IOCON_FUNC2}, /* TXD3 */
 {0,  1,   IOCON_MODE_INACT,                   IOCON_FUNC2}, /* RXD3 */
 {0,  4,   IOCON_MODE_INACT,                   IOCON_FUNC2}, /* CAN-RD2 */
 {0,  5,   IOCON_MODE_INACT,                   IOCON_FUNC2}, /* CAN-TD2 */
 {0,  22,  IOCON_MODE_INACT,                   IOCON_FUNC0}, /* Led 0 */
 {0,  23,  IOCON_MODE_INACT,                   IOCON_FUNC1}, /* ADC 0 */
 {0,  26,  IOCON_MODE_INACT,                   IOCON_FUNC2}, /* DAC */
 /* ENET */
 {0x1, 0,  IOCON_MODE_INACT,                   IOCON_FUNC1}, /* ENET_TXD0 */
 {0x1, 1,  IOCON_MODE_INACT,                   IOCON_FUNC1}, /* ENET_TXD1 */
 {0x1, 4,  IOCON_MODE_INACT,                   IOCON_FUNC1}, /* ENET_TX_EN */
 {0x1, 8,  IOCON_MODE_INACT,                   IOCON_FUNC1}, /* ENET_CRS */
 {0x1, 9,  IOCON_MODE_INACT,                   IOCON_FUNC1}, /* ENET_RXD0 */
 {0x1, 10, IOCON_MODE_INACT,                   IOCON_FUNC1}, /* ENET_RXD1 */
 {0x1, 14, IOCON_MODE_INACT,                   IOCON_FUNC1}, /* ENET_RX_ER */
 {0x1, 15, IOCON_MODE_INACT,                   IOCON_FUNC1}, /* ENET_REF_CLK */
 {0x1, 16, IOCON_MODE_INACT,                   IOCON_FUNC1}, /* ENET_MDC */
 {0x1, 17, IOCON_MODE_INACT,                   IOCON_FUNC1}, /* ENET_MDIO */
};

/*****************************************************************************
 * Public types/enumerations/variables
 ****************************************************************************/

/*****************************************************************************
 * Private functions
 ****************************************************************************/

/* Setup system clocking */
STATIC void SystemSetupClocking(void)
{
 /* CPU clock source starts with IRC */
 Chip_Clock_SetMainPllSource(SYSCTL_PLLCLKSRC_IRC);
 Chip_Clock_SetCPUClockSource(SYSCTL_CCLKSRC_SYSCLK);

 /* Enable main oscillator used for PLLs */
 LPC_SYSCTL->SCS = SYSCTL_OSCEC;
 while ((LPC_SYSCTL->SCS & SYSCTL_OSCSTAT) == 0) {}

 /* PLL0 clock source is 12MHz oscillator, PLL1 can only be the
    main oscillator */
 Chip_Clock_SetMainPllSource(SYSCTL_PLLCLKSRC_MAINOSC);

 /* Setup PLL0 for a 480MHz clock. It is divided by CPU Clock Divider to create CPU Clock.
    Input clock rate (FIN) is main oscillator = 12MHz
    FCCO is selected for PLL Output and it must be between 275 MHz to 550 MHz.
    FCCO = (2 * M * FIN) / N = integer multiplier of CPU Clock (120MHz) = 480MHz
    N = 1, M = 480 * 1/(2*12) = 20 */
 Chip_Clock_SetupPLL(SYSCTL_MAIN_PLL, 19, 0);/* Multiply by 20, Divide by 1 */

 /* Enable PLL0 */
 Chip_Clock_EnablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_ENABLE);

 /* Change the CPU Clock Divider setting for the operation with PLL0.
    Divide value = (480/120) = 4 */
 Chip_Clock_SetCPUClockDiv(3); /* pre-minus 1 */

 /* Change the USB Clock Divider setting for the operation with PLL0.
    Divide value = (480/48) = 10 */
 Chip_Clock_SetUSBClockDiv(9); /* pre-minus 1 */

 /* Wait for PLL0 to lock */
 while (!Chip_Clock_IsMainPLLLocked()) {}

 /* Connect PLL0 */
 Chip_Clock_EnablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_ENABLE | SYSCTL_PLL_CONNECT);

 /* Wait for PLL0 to be connected */
 while (!Chip_Clock_IsMainPLLConnected()) {}

 /* Setup USB PLL1 for a 48MHz clock
    Input clock rate (FIN) is main oscillator = 12MHz
    PLL1 Output = USBCLK = 48MHz = FIN * MSEL, so MSEL = 4.
    FCCO = USBCLK = USBCLK * 2 * P. It must be between 156 MHz to 320 MHz.
    so P = 2 and FCCO = 48MHz * 2 * 2 = 192MHz */
 Chip_Clock_SetupPLL(SYSCTL_USB_PLL, 3, 1); /* Multiply by 4, Divide by 2 */

#if 0 /* Use PLL1 output as USB Clock Source */
  /* Enable PLL1 */
 Chip_Clock_EnablePLL(SYSCTL_USB_PLL, SYSCTL_PLL_ENABLE);

 /* Wait for PLL1 to lock */
 while (!Chip_Clock_IsUSBPLLLocked()) {}

 /* Connect PLL1 */
 Chip_Clock_EnablePLL(SYSCTL_USB_PLL, SYSCTL_PLL_ENABLE | SYSCTL_PLL_CONNECT);

 /* Wait for PLL1 to be connected */
 while (!Chip_Clock_IsUSBPLLConnected()) {}
#endif

 /* Setup FLASH access to 5 clocks (120MHz clock) */
 Chip_FMC_SetFLASHAccess(FLASHTIM_120MHZ_CPU);
}

/* Sets up system pin muxing */
STATIC void SystemSetupMuxing(void)
{
 int i;

 /* Setup system level pin muxing */
 for (i = 0; i < (sizeof(pinmuxing) / sizeof(pinmuxing[0])); i++) {
  Chip_IOCON_PinMux(LPC_IOCON, pinmuxing[i].pingrp, pinmuxing[i].pinnum,
        pinmuxing[i].pincfg, pinmuxing[i].funcnum);
 }
}

/*****************************************************************************
 * Public functions
 ****************************************************************************/

void SystemInit(void)
{
 unsigned int *pSCB_VTOR = (unsigned int *) 0xE000ED08;

#if defined(__IAR_SYSTEMS_ICC__)
 extern void *__vector_table;

 *pSCB_VTOR = (unsigned int) &__vector_table;
#elif defined(__CODE_RED)
 extern void *g_pfnVectors;

 *pSCB_VTOR = (unsigned int) &g_pfnVectors;
#elif defined(__ARMCC_VERSION)
 extern void *__Vectors;

 *pSCB_VTOR = (unsigned int) &__Vectors;
#endif

 /* Setup system clocking and memory. This is done early to allow the
    application and tools to clear memory and use scatter loading to
    external memory. */
 SystemSetupClocking();
 SystemSetupMuxing();
}