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/*
* @brief LPC5410X Chip specific SystemInit
*
* @note
* Copyright(C) NXP Semiconductors, 2014
* 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 "chip.h"
/*****************************************************************************
* Private types/enumerations/variables
****************************************************************************/
/*****************************************************************************
* Public types/enumerations/variables
****************************************************************************/
/*****************************************************************************
* Private functions
****************************************************************************/
/* Sets the best FLASH clock arte for the passed frequency */
static void setupFlashClocks(uint32_t freq)
{
/* v17.0 ROM support only - coarse FLASH clocking timing.
FLASH access is setup based on voltage for v17.1 and later ROMs
as part of the power library. */
if (Chip_POWER_GetROMVersion() == LPC5410X_ROMVER_0) {
if (freq < 20000000) {
Chip_SYSCON_SetFLASHAccess(SYSCON_FLASH_1CYCLE);
}
else if (freq < 48000000) {
Chip_SYSCON_SetFLASHAccess(SYSCON_FLASH_2CYCLE);
}
else if (freq < 72000000) {
Chip_SYSCON_SetFLASHAccess(SYSCON_FLASH_3CYCLE);
}
else {
Chip_SYSCON_SetFLASHAccess(SYSCON_FLASH_4CYCLE);
}
}
}
/*****************************************************************************
* Public functions
****************************************************************************/
/* Clock and PLL initialization based on the internal oscillator */
void Chip_SetupIrcClocking(uint32_t iFreq)
{
PLL_CONFIG_T pllConfig;
PLL_SETUP_T pllSetup;
PLL_ERROR_T pllError;
/* Turn on the IRC by clearing the power down bit */
Chip_SYSCON_PowerUp(SYSCON_PDRUNCFG_PD_IRC_OSC | SYSCON_PDRUNCFG_PD_IRC);
/* Select the PLL input to the IRC */
Chip_Clock_SetSystemPLLSource(SYSCON_PLLCLKSRC_IRC);
/* Setup FLASH access û��ȥ??*/
setupFlashClocks(iFreq);
/* Power down PLL to change the PLL divider ratio */
Chip_SYSCON_PowerDown(SYSCON_PDRUNCFG_PD_SYS_PLL);
/* Setup PLL configuration */
pllConfig.desiredRate = iFreq;
pllConfig.InputRate = 0;
pllConfig.flags = PLL_CONFIGFLAG_FORCENOFRACT;
pllError = Chip_Clock_SetupPLLData(&pllConfig, &pllSetup);
if (pllError == PLL_ERROR_SUCCESS) {
pllSetup.flags = PLL_SETUPFLAG_WAITLOCK | PLL_SETUPFLAG_ADGVOLT;
pllError = Chip_Clock_SetupSystemPLLPrec(&pllSetup);
}
/* Set system clock divider to 1 */
Chip_Clock_SetSysClockDiv(1);
/* Set main clock source to the system PLL. This will drive 24MHz
for the main clock and 24MHz for the system clock */
Chip_Clock_SetMainClockSource(SYSCON_MAINCLKSRC_PLLOUT);
/* ASYSNC SYSCON needs to be on or all serial peripheral won't work.
Be careful if PLL is used or not, ASYNC_SYSCON source needs to be
selected carefully. */
Chip_SYSCON_Enable_ASYNC_Syscon(true);
Chip_Clock_SetAsyncSysconClockDiv(1);
Chip_Clock_SetAsyncSysconClockSource(SYSCON_ASYNC_IRC);
}
/* Clock and PLL initialization based on the external clock input */
void Chip_SetupExtInClocking(uint32_t iFreq)
{
PLL_CONFIG_T pllConfig;
PLL_SETUP_T pllSetup;
PLL_ERROR_T pllError;
/* IOCON clock left on, this is needed is CLKIN is used. */
Chip_Clock_EnablePeriphClock(SYSCON_CLOCK_IOCON);
/* Select external clock input pin */
Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 22, (IOCON_MODE_PULLUP |
IOCON_FUNC1 | IOCON_DIGITAL_EN | IOCON_INPFILT_OFF));
/* Select the PLL input to the EXT clock input */
Chip_Clock_SetSystemPLLSource(SYSCON_PLLCLKSRC_CLKIN);
/* Setup FLASH access */
setupFlashClocks(iFreq);
/* Power down PLL to change the PLL divider ratio */
Chip_SYSCON_PowerDown(SYSCON_PDRUNCFG_PD_SYS_PLL);
/* Setup PLL configuration */
pllConfig.desiredRate = iFreq;
pllConfig.InputRate = 0;
pllConfig.flags = PLL_CONFIGFLAG_FORCENOFRACT;
pllError = Chip_Clock_SetupPLLData(&pllConfig, &pllSetup);
if (pllError == PLL_ERROR_SUCCESS) {
pllSetup.flags = PLL_SETUPFLAG_WAITLOCK | PLL_SETUPFLAG_ADGVOLT;
pllError = Chip_Clock_SetupSystemPLLPrec(&pllSetup);
}
/* Set system clock divider to 1 */
Chip_Clock_SetSysClockDiv(1);
/* Set main clock source to the system PLL. This will drive 24MHz
for the main clock and 24MHz for the system clock */
Chip_Clock_SetMainClockSource(SYSCON_MAINCLKSRC_PLLOUT);
/* ASYSNC SYSCON needs to be on or all serial peripheral won't work.
Be careful if PLL is used or not, ASYNC_SYSCON source needs to be
selected carefully. */
Chip_SYSCON_Enable_ASYNC_Syscon(true);
Chip_Clock_SetAsyncSysconClockDiv(1);
Chip_Clock_SetAsyncSysconClockSource(SYSCON_ASYNC_IRC);
}
/* Set up and initialize hardware prior to call to main */
void Chip_SystemInit(void)
{
/* Initial internal clocking @100MHz */
Chip_SetupIrcClocking(100000000);
}
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