tinySA/demos/LPC214x-GCC/chcore.c

/*
    ChibiOS/RT - Copyright (C) 2006-2007 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/>.
*/

#include <ch.h>

#include "lpc214x.h"
#include "lpc214x_serial.h"
#include "buzzer.h"

extern void IrqHandler(void);
extern void T0IrqHandler(void);

#define VAL_TC0_PRESCALER 0

/*
 * Pins configuration for Olimex LPC-P2148.
 *
 * PINSEL0
 *  P0  P0  P0  P0  P0  P0  RXD TXD SSE MOS MIS SCK SDA SCL RXD TXD
 *  15  14  13  12  11  10  1   1   L0  I0  O0  0   0   0   0   0
 *  00  00  00  00  00  00  01  01  01  01  01  01  01  01  01  01
 *  IN  IN  OUT OUT OUT OUT --  --  --  --  --  --  --  --  --  --
 *  0   0   1   1   1   1   0   0   0   0   0   0   0   0   0   0
 *
 * PINSEL1
 *  P0  AD  P0  P0  --  --  AO  --  VB  P0  P0  SSE MOS MIS SCK P0
 *  31  03  29  28  --  --  UT  --  US  22  21  L1  I1  O1  1   16
 *  00  01  00  00  00  00  10  00  01  00  00  10  10  10  10  00
 *  OUT --  OUT OUT --  --  --  --  --  OUT OUT --  --  --  --  IN
 *  1   0   1   1   0   0   0   0   0   1   1   0   0   0   0   0
 *
 * PINSEL2
 *  --  --  --  --  --  --  --  --  --  --  --  --  --  --  GP  DBG --
 *  --  --  --  --  --  --  --  --  --  --  --  --  --  --  IO      --
 *  00  00  00  00  00  00  00  00  00  00  00  00  00  00  0   1   00
 *  --  --  --  --  --  --  --  --  --  --  --  --  --  --  IN  --  --
 */
#define VAL_PINSEL0 0x00055555
#define VAL_PINSEL1 0x100842A8
#define VAL_PINSEL2 0x00000004
#define VAL_FIO0DIR 0xB0603C00
#define VAL_FIO1DIR 0x00000000

/*
 * Hardware initialization goes here.
 * NOTE: Interrupts are still disabled.
 */
void hwinit(void) {
  int i;

  /*
   * 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 = PLLBase;
  pll->PLL0_CFG  = 0x23;        /* P and M values. */
  pll->PLL0_CON  = 0x1;         /* Enalbles the PLL 0. */
  pll->PLL0_FEED = 0xAA;
  pll->PLL0_FEED = 0x55;
  while (!(pll->PLL0_STAT & 0x400))
    ;                           /* Wait for PLL lock. */

  pll->PLL0_CON  = 0x3;         /* Connects the PLL. */
  pll->PLL0_FEED = 0xAA;
  pll->PLL0_FEED = 0x55;

  /*
   * VPB setup.
   * PCLK = CCLK / 4.
   */
  VPBDIV = VPD_D4;

  /*
   * I/O pins configuration.
   */
  PINSEL0 = VAL_PINSEL0;
  PINSEL1 = VAL_PINSEL1;
  PINSEL2 = VAL_PINSEL2;
  IO0DIR = VAL_FIO0DIR;
  IO0SET = 0xFFFFFFFF;
  IO1DIR = VAL_FIO1DIR;
  IO1SET = 0xFFFFFFFF;

  /*
   * Interrupt vectors assignment.
   * NOTE: Better reset everything in the VIC, it is a HUGE source of trouble.
   */
  VIC *vic = VICBase;
  vic->VIC_IntSelect = 0;
  vic->VIC_IntEnable = 0;
  vic->VIC_VectAddr = 0;
  for (i = 0; i < 16; i++) {
    vic->VIC_VectCntls[i] = 0;
    vic->VIC_VectAddrs[i] = 0;
  }
  vic->VIC_DefVectAddr = (IOREG32)IrqHandler;
  SetVICVector(T0IrqHandler, 0, SOURCE_Timer0);
  SetVICVector(UART0IrqHandler, 1, SOURCE_UART0);
  SetVICVector(UART1IrqHandler, 2, SOURCE_UART1);

  /*
   * System Timer initialization, 1ms intervals.
   */
  vic->VIC_IntEnable |= INTMASK(SOURCE_Timer0);
  TC *timer = T0Base;
  timer->TC_PR = VAL_TC0_PRESCALER;
  timer->TC_MR0 = (PCLK / CH_FREQUENCY) / (VAL_TC0_PRESCALER + 1);
  timer->TC_MCR = 3;    /* Interrupt and clear TC on match MR0. */
  timer->TC_TCR = 2;    /* Reset counter and prescaler. */
  timer->TC_TCR = 1;    /* Timer enabled. */

  /*
   * Other subsystems.
   */
  InitSerial();
  InitBuzzer();
}

void chSysPause(void) {

  while (TRUE) {
// Note, it is disabled because it causes trouble with the JTAG probe.
// Enable it in the final code only.
//    PCON = 1;   /* Stops CPU clock until next interrupt. */
  }
}

/*
 * System halt.
 * Yellow LED only.
 */
void chSysHalt(void) {

  chSysLock();
  IO0SET = 0x80000C00;
  IO0CLR = 0x80000000;
  while (TRUE)
    ;
}

/*
 * Set a vector for an interrupt source, the vector is enabled too.
 */
void SetVICVector(void *handler, int vector, int source) {

  VIC *vicp = VICBase;
  vicp->VIC_VectAddrs[vector] = (IOREG32)handler;
  vicp->VIC_VectCntls[vector] = (IOREG32)(source | 0x20);
}

/*
 * Undefined Instruction exception handler.
 * Yellow LED + RED LED 2.
 */
void UndHandler(void) {
  IO0SET = 0x80000C00;
  IO0CLR = 0x80000800;
  while(TRUE)
    ;
}

/*
 * Prefetch exception handler.
 * Yellow LED + RED LED 1.
 */
void PrefetchHandler(void) {
  IO0SET = 0x80000C00;
  IO0CLR = 0x80000400;
  while(TRUE)
    ;
}

/*
 * Abort exception handler.
 * Yellow LED + both RED LEDs.
 */
void AbortHandler(void) {
  IO0SET = 0x80000C00;
  IO0CLR = 0x80000C00;
  while(TRUE)
    ;
}

/*
 * Non-vectored IRQs handling here.
 */
void NonVectoredIrq(void) {
  VICVectAddr = 0;
}

/*
 * Timer 0 IRQ handling here.
 */
void Timer0Irq(void) {
  chSchTimerHandlerI();
  T0IR = 1;             /* Clear interrupt on match MR0. */
  VICVectAddr = 0;
}