nes-proj/cpu/pic32/pic32.c
2012-12-17 09:14:23 +01:00

138 lines
4.3 KiB
C

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