max1168_arch.c

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/*
 * Copyright (C) 2008-2009 Antoine Drouin <poinix@gmail.com>
 * Copyright (C) 2012 Gautier Hattenberger
 *
 * This file is part of paparazzi.
 *
 * paparazzi 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 2, or (at your option)
 * any later version.
 *
 * paparazzi 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 paparazzi; see the file COPYING.  If not, write to
 * the Free Software Foundation, 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "peripherals/max1168.h"

#include "LPC21xx.h"
#include "armVIC.h"
#include BOARD_CONFIG

static void EXTINT0_ISR(void) __attribute__((naked));

void max1168_arch_init(void)
{

  /* connect P0.16 to extint0 (EOC) */
  MAX1168_EOC_PINSEL |= MAX1168_EOC_PINSEL_VAL << MAX1168_EOC_PINSEL_BIT;
  /* extint0 is edge trigered */
  SetBit(EXTMODE, MAX1168_EOC_EINT);
  /* extint0 is trigered on falling edge */
  ClearBit(EXTPOLAR, MAX1168_EOC_EINT);
  /* clear pending extint0 before enabling interrupts */
  SetBit(EXTINT, MAX1168_EOC_EINT);

  /* initialize interrupt vector */
  VICIntSelect &= ~VIC_BIT(MAX1168_EOC_VIC_IT);                       // EXTINT0 selected as IRQ
  VICIntEnable = VIC_BIT(MAX1168_EOC_VIC_IT);                         // EXTINT0 interrupt enabled
  _VIC_CNTL(MAX1168_EOC_VIC_SLOT) = VIC_ENABLE | MAX1168_EOC_VIC_IT;
  _VIC_ADDR(MAX1168_EOC_VIC_SLOT) = (uint32_t)EXTINT0_ISR;   // address of the ISR
}


void EXTINT0_ISR(void)
{
  ISR_ENTRY();
  //ASSERT((max1168_status == MAX1168_SENDING_REQ), DEBUG_MAX_1168, MAX1168_ERR_SPURIOUS_EOC);

  max1168_status = MAX1168_GOT_EOC;

  //SetBit(EXTINT, MAX1168_EOC_EINT);   /* clear extint0 */
  EXTINT = (1 << MAX1168_EOC_EINT);
  VICVectAddr = 0x00000000;             /* clear this interrupt from the VIC */

  ISR_EXIT();
}