170 lines
6.1 KiB
C
170 lines
6.1 KiB
C
/*
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* @brief LPC5410X Chip specific SystemInit
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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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/*****************************************************************************
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* Private functions
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****************************************************************************/
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/* Sets the best FLASH clock arte for the passed frequency */
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static void setupFlashClocks(uint32_t freq)
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{
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/* v17.0 ROM support only - coarse FLASH clocking timing.
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FLASH access is setup based on voltage for v17.1 and later ROMs
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as part of the power library. */
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if (Chip_POWER_GetROMVersion() == LPC5410X_ROMVER_0) {
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if (freq < 20000000) {
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Chip_SYSCON_SetFLASHAccess(SYSCON_FLASH_1CYCLE);
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}
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else if (freq < 48000000) {
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Chip_SYSCON_SetFLASHAccess(SYSCON_FLASH_2CYCLE);
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}
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else if (freq < 72000000) {
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Chip_SYSCON_SetFLASHAccess(SYSCON_FLASH_3CYCLE);
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}
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else {
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Chip_SYSCON_SetFLASHAccess(SYSCON_FLASH_4CYCLE);
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}
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}
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}
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/*****************************************************************************
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* Public functions
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****************************************************************************/
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/* Clock and PLL initialization based on the internal oscillator */
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void Chip_SetupIrcClocking(uint32_t iFreq)
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{
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PLL_CONFIG_T pllConfig;
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PLL_SETUP_T pllSetup;
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PLL_ERROR_T pllError;
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/* Turn on the IRC by clearing the power down bit */
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Chip_SYSCON_PowerUp(SYSCON_PDRUNCFG_PD_IRC_OSC | SYSCON_PDRUNCFG_PD_IRC);
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/* Select the PLL input to the IRC */
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Chip_Clock_SetSystemPLLSource(SYSCON_PLLCLKSRC_IRC);
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/* Setup FLASH access û<><C3BB>ȥ??*/
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setupFlashClocks(iFreq);
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/* Power down PLL to change the PLL divider ratio */
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Chip_SYSCON_PowerDown(SYSCON_PDRUNCFG_PD_SYS_PLL);
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/* Setup PLL configuration */
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pllConfig.desiredRate = iFreq;
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pllConfig.InputRate = 0;
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pllConfig.flags = PLL_CONFIGFLAG_FORCENOFRACT;
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pllError = Chip_Clock_SetupPLLData(&pllConfig, &pllSetup);
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if (pllError == PLL_ERROR_SUCCESS) {
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pllSetup.flags = PLL_SETUPFLAG_WAITLOCK | PLL_SETUPFLAG_ADGVOLT;
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pllError = Chip_Clock_SetupSystemPLLPrec(&pllSetup);
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}
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/* Set system clock divider to 1 */
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Chip_Clock_SetSysClockDiv(1);
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/* Set main clock source to the system PLL. This will drive 24MHz
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for the main clock and 24MHz for the system clock */
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Chip_Clock_SetMainClockSource(SYSCON_MAINCLKSRC_PLLOUT);
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/* ASYSNC SYSCON needs to be on or all serial peripheral won't work.
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Be careful if PLL is used or not, ASYNC_SYSCON source needs to be
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selected carefully. */
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Chip_SYSCON_Enable_ASYNC_Syscon(true);
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Chip_Clock_SetAsyncSysconClockDiv(1);
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Chip_Clock_SetAsyncSysconClockSource(SYSCON_ASYNC_IRC);
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}
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/* Clock and PLL initialization based on the external clock input */
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void Chip_SetupExtInClocking(uint32_t iFreq)
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{
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PLL_CONFIG_T pllConfig;
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PLL_SETUP_T pllSetup;
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PLL_ERROR_T pllError;
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/* IOCON clock left on, this is needed is CLKIN is used. */
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Chip_Clock_EnablePeriphClock(SYSCON_CLOCK_IOCON);
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/* Select external clock input pin */
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Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 22, (IOCON_MODE_PULLUP |
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IOCON_FUNC1 | IOCON_DIGITAL_EN | IOCON_INPFILT_OFF));
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/* Select the PLL input to the EXT clock input */
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Chip_Clock_SetSystemPLLSource(SYSCON_PLLCLKSRC_CLKIN);
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/* Setup FLASH access */
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setupFlashClocks(iFreq);
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/* Power down PLL to change the PLL divider ratio */
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Chip_SYSCON_PowerDown(SYSCON_PDRUNCFG_PD_SYS_PLL);
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/* Setup PLL configuration */
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pllConfig.desiredRate = iFreq;
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pllConfig.InputRate = 0;
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pllConfig.flags = PLL_CONFIGFLAG_FORCENOFRACT;
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pllError = Chip_Clock_SetupPLLData(&pllConfig, &pllSetup);
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if (pllError == PLL_ERROR_SUCCESS) {
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pllSetup.flags = PLL_SETUPFLAG_WAITLOCK | PLL_SETUPFLAG_ADGVOLT;
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pllError = Chip_Clock_SetupSystemPLLPrec(&pllSetup);
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}
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/* Set system clock divider to 1 */
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Chip_Clock_SetSysClockDiv(1);
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/* Set main clock source to the system PLL. This will drive 24MHz
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for the main clock and 24MHz for the system clock */
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Chip_Clock_SetMainClockSource(SYSCON_MAINCLKSRC_PLLOUT);
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/* ASYSNC SYSCON needs to be on or all serial peripheral won't work.
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Be careful if PLL is used or not, ASYNC_SYSCON source needs to be
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selected carefully. */
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Chip_SYSCON_Enable_ASYNC_Syscon(true);
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Chip_Clock_SetAsyncSysconClockDiv(1);
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Chip_Clock_SetAsyncSysconClockSource(SYSCON_ASYNC_IRC);
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}
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/* Set up and initialize hardware prior to call to main */
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void Chip_SystemInit(void)
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{
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/* Initial internal clocking @100MHz */
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Chip_SetupIrcClocking(100000000);
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}
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