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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file LPC214x/hal_lld.c
* @brief LPC214x HAL subsystem low level driver source.
*
* @addtogroup HAL
* @{
*/
#include "ch.h"
#include "hal.h"
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*
* Non-vectored IRQs handler, the default action can be overridden by
* redefining the @p LPC214x_NON_VECTORED_IRQ_HOOK() hook macro.
*/
static CH_IRQ_HANDLER(irq_handler) {
CH_IRQ_PROLOGUE();
LPC214x_NON_VECTORED_IRQ_HOOK();
VICVectAddr = 0;
CH_IRQ_EPILOGUE();
}
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level HAL driver initialization.
*
* @notapi
*/
void hal_lld_init(void) {
vic_init();
VICDefVectAddr = (IOREG32)irq_handler;
}
/**
* @brief LPC214x clocks and PLL initialization.
* @note All the involved constants come from the file @p board.h.
* @note This function must be invoked only after the system reset.
*
* @special
*/
void lpc214x_clock_init(void) {
/*
* All peripherals clock disabled by default in order to save power.
*/
PCONP = PCRTC | PCTIM0;
/*
* MAM setup.
*/
MAMTIM = 0x3; /* 3 cycles for flash accesses. */
MAMCR = 0x2; /* MAM fully enabled. */
/*
* PLL setup for Fosc=12MHz and CCLK=48MHz.
* P=2 M=3.
*/
PLL *pll = PLL0Base;
pll->PLL_CFG = 0x23; /* P and M values. */
pll->PLL_CON = 0x1; /* Enables the PLL 0. */
pll->PLL_FEED = 0xAA;
pll->PLL_FEED = 0x55;
while (!(pll->PLL_STAT & 0x400))
; /* Wait for PLL lock. */
pll->PLL_CON = 0x3; /* Connects the PLL. */
pll->PLL_FEED = 0xAA;
pll->PLL_FEED = 0x55;
/*
* VPB setup.
* PCLK = CCLK / 4.
*/
VPBDIV = VPD_D4;
}
/** @} */
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