117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
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/*
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ChibiOS - Copyright (C) 2006-2014 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 LPC214x/hal_lld.c
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* @brief LPC214x 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 "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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* Non-vectored IRQs handler, the default action can be overridden by
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* redefining the @p LPC214x_NON_VECTORED_IRQ_HOOK() hook macro.
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*/
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static CH_IRQ_HANDLER(irq_handler) {
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CH_IRQ_PROLOGUE();
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LPC214x_NON_VECTORED_IRQ_HOOK();
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VICVectAddr = 0;
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CH_IRQ_EPILOGUE();
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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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vic_init();
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VICDefVectAddr = (IOREG32)irq_handler;
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}
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/**
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* @brief LPC214x 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 lpc214x_clock_init(void) {
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/*
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* All peripherals clock disabled by default in order to save power.
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*/
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PCONP = PCRTC | PCTIM0;
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/*
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* MAM setup.
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*/
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MAMTIM = 0x3; /* 3 cycles for flash accesses. */
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MAMCR = 0x2; /* MAM fully enabled. */
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/*
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* PLL setup for Fosc=12MHz and CCLK=48MHz.
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* P=2 M=3.
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*/
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PLL *pll = PLL0Base;
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pll->PLL_CFG = 0x23; /* P and M values. */
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pll->PLL_CON = 0x1; /* Enables the PLL 0. */
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pll->PLL_FEED = 0xAA;
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pll->PLL_FEED = 0x55;
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while (!(pll->PLL_STAT & 0x400))
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; /* Wait for PLL lock. */
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pll->PLL_CON = 0x3; /* Connects the PLL. */
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pll->PLL_FEED = 0xAA;
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pll->PLL_FEED = 0x55;
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/*
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* VPB setup.
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* PCLK = CCLK / 4.
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*/
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VPBDIV = VPD_D4;
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}
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/** @} */
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