tinySA/os/hal/platforms/LPC214x/hal_lld.c

/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012 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;
}

/** @} */