124 lines
4.8 KiB
C
124 lines
4.8 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file LPC122x/hal_lld.c
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* @brief LPC122x HAL subsystem low level driver source.
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*
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* @addtogroup HAL
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level HAL driver initialization.
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*
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* @notapi
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*/
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void hal_lld_init(void) {
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/* SysTick initialization using the system clock.*/
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nvicSetSystemHandlerPriority(HANDLER_SYSTICK, CORTEX_PRIORITY_SYSTICK);
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SysTick->LOAD = LPC122x_SYSCLK / CH_CFG_FREQUENCY - 1;
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SysTick->VAL = 0;
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SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |
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SysTick_CTRL_ENABLE_Msk |
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SysTick_CTRL_TICKINT_Msk;
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}
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/**
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* @brief LPC122x clocks and PLL initialization.
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* @note All the involved constants come from the file @p board.h.
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* @note This function must be invoked only after the system reset.
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*
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* @special
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*/
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void lpc122x_clock_init(void) {
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unsigned i;
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LPC_WWDT->MOD = 0; /* Disable Watchdog */
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LPC_WWDT->FEED = 0xAA;
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LPC_WWDT->FEED = 0x55;
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#if LPC122x_FLASHCFG_FLASHTIM == 0
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LPC_SYSCON->PRESETCTRL |= (1 << 15); /* Flash 1-cycle read mode */
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#else
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LPC_FLASHCTRL->FLASHCFG = 0; /* 2 system clock cycles flash access time */
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LPC_SYSCON->PRESETCTRL &= ~(1 << 15); /* Flash multi-cycle read mode */
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#endif
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/* System oscillator initialization if required.*/
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#if LPC122x_MAINCLK_SOURCE == SYSMAINCLKSEL_PLLOUT
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#if LPC122x_PLLCLK_SOURCE == SYSPLLCLKSEL_SYSOSC
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LPC_SYSCON->SYSOSCCTRL = LPC122x_SYSOSCCTRL;
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LPC_SYSCON->PDRUNCFG &= ~(1 << 5); /* System oscillator ON. */
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for (i = 0; i < 200; i++)
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__NOP(); /* Stabilization delay. */
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#endif /* LPC122x_PLLCLK_SOURCE == SYSPLLCLKSEL_SYSOSC */
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/* PLL initialization if required.*/
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LPC_SYSCON->SYSPLLCLKSEL = LPC122x_PLLCLK_SOURCE;
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LPC_SYSCON->SYSPLLCLKUEN = 1; /* Really required? */
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LPC_SYSCON->SYSPLLCLKUEN = 0;
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LPC_SYSCON->SYSPLLCLKUEN = 1;
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LPC_SYSCON->SYSPLLCTRL = LPC122x_SYSPLLCTRL_MSEL | LPC122x_SYSPLLCTRL_PSEL;
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LPC_SYSCON->PDRUNCFG &= ~(1 << 7); /* System PLL ON. */
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while ((LPC_SYSCON->SYSPLLSTAT & 1) == 0) /* Wait PLL lock. */
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;
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#endif /* LPC122x_MAINCLK_SOURCE == SYSMAINCLKSEL_PLLOUT */
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/* Main clock source selection.*/
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LPC_SYSCON->MAINCLKSEL = LPC122x_MAINCLK_SOURCE;
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LPC_SYSCON->MAINCLKUEN = 1; /* Really required? */
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LPC_SYSCON->MAINCLKUEN = 0;
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LPC_SYSCON->MAINCLKUEN = 1;
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while ((LPC_SYSCON->MAINCLKUEN & 1) == 0) /* Wait switch completion. */
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;
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/* ABH divider initialization, peripheral clocks are initially disabled,
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the various device drivers will handle their own setup except GPIO and
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IOCON that are left enabled.*/
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LPC_SYSCON->SYSAHBCLKDIV = LPC122x_SYSABHCLK_DIV;
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LPC_SYSCON->SYSAHBCLKCTRL = 0xE009001F;
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/* Memory remapping, vectors always in ROM.*/
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LPC_SYSCON->SYSMEMREMAP = 2;
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}
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/** @} */
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