nes-proj/cpu/cc2430/dev/bus.c

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/*
* Copyright (c) 2009, Swedish Institute of Computer Science.
* 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.
*
* This file is part of the Contiki operating system.
*
* $Id: bus.c,v 1.2 2010/01/25 23:12:09 anthony-a Exp $
*/
/**
* \file
* Initialization functions for the 8051 bus
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "banked.h"
#include "cc2430_sfr.h"
#include "dev/bus.h"
#include "sys/clock.h"
/*---------------------------------------------------------------------------*/
void
bus_init (void) __banked
{
CLKCON = (0x00 | OSC32K); /* 32k internal */
while(CLKCON != (0x00 | OSC32K));
P1DIR |= 0x0E;
IEN0_EA = 1;
/* Initialize the clock */
clock_init();
}
/*---------------------------------------------------------------------------*/
/**
* Read a block of code memory.
* The code must be placed in the lowest bank of flash.
*
* \param address address to read from flash
* \param buffer buffer to store data
* \param size number of bytes to read
*/
void
flash_read (uint8_t *buf, uint32_t address, uint8_t size) __banked
{
buf; /*dptr0*/
address; /*stack-6*/
size; /*stack-7*/
buf;
DISABLE_INTERRUPTS();
__asm
mov dpl, r2
mov dph, r3
mov a, r0
push acc
mov a, r2
push acc
mov a, _MEMCTR
push acc
mov a, _bp
add a, #0xf9 ;stack - 7 = size
mov r0,a
mov a, @r0 ;r2 = size
mov r2, a ;r2 = size
inc r0
mov a, @r0
mov _DPL1, a ;DPTR1 = address & 0x7FFF | 0x8000
inc r0
mov a, @r0
orl a, #0x80
mov _DPH1, a
inc r0 ;MEMCTR = ((address >> 15 & 3) << 4) | 0x01 (bank select)
mov a, @r0
dec r0
rrc a
mov a, @r0
rrc a
rr a
rr a
anl a, #0x30
orl a, #1
mov _MEMCTR,a
lp1:
mov _DPS, #1 ;active DPTR = 1
clr a
movc a, @a+dptr ;read flash (DPTR1)
inc dptr
mov _DPS, #0 ;active DPTR = 0
movx @dptr,a ;write to DPTR0
inc dptr
djnz r2,lp1 ;while (--size)
pop acc
mov _MEMCTR, a ;restore bank
pop acc
mov r2,a
pop acc
mov r0,a
__endasm;
ENABLE_INTERRUPTS();
DPL1 = *buf++;
}
/*---------------------------------------------------------------------------*/