138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
/*
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* Contiki PIC32 Port project
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*
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* Copyright (c) 2012,
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* Scuola Superiore Sant'Anna (http://www.sssup.it) and
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* Consorzio Nazionale Interuniversitario per le Telecomunicazioni
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* (http://www.cnit.it).
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/**
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* \addtogroup pic32 PIC32 Contiki Port
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*
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* @{
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*/
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/**
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* \file cpu/pic32/mtarch.h
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* \brief PIC32MX initialization routines
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* \author Giovanni Pellerano <giovanni.pellerano@evilaliv3.org>
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* \author Daniele Alessandrelli <d.alessandrelli@sssup.it>
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* \date 2012-03-23
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*/
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/*
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* PIC32MX795F512L - Specific Functions
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*
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* All the functions in this part of the file are specific for the
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* pic32mx795f512l that is characterized by registers' name that differ from
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* the 3xx and 4xx families of the pic32mx.
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*/
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#include <pic32_irq.h>
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#include <p32xxxx.h>
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#include <peripheral/system.h>
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#include <stdint.h>
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#include <dev/leds.h>
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/* General Excepiton Handler: overrides the default handler */
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static enum {
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EXCEP_IRQ = 0, /* interrupt */
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EXCEP_AdEL = 4, /* address error exception (load or ifetch) */
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EXCEP_AdES, /* address error exception (store) */
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EXCEP_IBE, /* bus error (ifetch) */
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EXCEP_DBE, /* bus error (load/store) */
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EXCEP_Sys, /* syscall */
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EXCEP_Bp, /* breakpoint */
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EXCEP_RI, /* reserved instruction */
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EXCEP_CpU, /* coprocessor unusable */
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EXCEP_Overflow, /* arithmetic overflow */
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EXCEP_Trap, /* trap (possible divide by zero) */
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EXCEP_IS1 = 16, /* implementation specfic 1 */
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EXCEP_CEU, /* CorExtend unuseable */
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EXCEP_C2E /* coprocessor 2 */
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} cp0_exception_code;
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static unsigned int cp0_exception_cause; /* CP0: CAUSE register */
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static unsigned int cp0_exception_epc; /* CP0: Exception Program Counter */
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/*---------------------------------------------------------------------------*/
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void
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pic32_init(void)
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{
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unsigned long int r;
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ASM_DIS_INT;
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/* Disable JTAG Port */
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DDPCONbits.JTAGEN = 0;
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// set the CP0 cause IV bit high
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asm volatile("mfc0 %0,$13" : "=r"(r));
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r |= 0x00800000;
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asm volatile("mtc0 %0,$13" : "+r"(r));
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INTCONSET = _INTCON_MVEC_MASK;
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SYSKEY = 0;
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SYSKEY = 0xaa996655;
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SYSKEY = 0x556699aa;
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/* Enable Sleep Mode */
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OSCCONCLR = 1 << _OSCCON_SLPEN_POSITION;
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SYSKEY = 0;
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ASM_EN_INT;
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}
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/*---------------------------------------------------------------------------*/
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void
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_general_exception_handler(void)
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{
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asm volatile ("mfc0 %0,$14":"=r" (cp0_exception_epc));
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asm volatile ("mfc0 %0,$13":"=r" (cp0_exception_cause));
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cp0_exception_code = (cp0_exception_cause >> 2) & 0x0000001F;
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leds_on(LEDS_ALL);
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while(1){
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;
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}
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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