376 lines
11 KiB
C
376 lines
11 KiB
C
/*
|
|
* Copyright (c) 2005, 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: msp430.c,v 1.1 2010/08/24 16:26:38 joxe Exp $
|
|
*/
|
|
#include <io.h>
|
|
#include <signal.h>
|
|
#include <sys/unistd.h>
|
|
#include "msp430.h"
|
|
#include "dev/watchdog.h"
|
|
#include "net/uip.h"
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
#if defined(__MSP430__) && defined(__GNUC__) && MSP430_MEMCPY_WORKAROUND
|
|
void *
|
|
w_memcpy(void *out, const void *in, size_t n)
|
|
{
|
|
uint8_t *src, *dest;
|
|
src = (uint8_t *) in;
|
|
dest = (uint8_t *) out;
|
|
while(n-- > 0) {
|
|
*dest++ = *src++;
|
|
}
|
|
return out;
|
|
}
|
|
#endif /* __GNUC__ && __MSP430__ && MSP430_MEMCPY_WORKAROUND */
|
|
/*---------------------------------------------------------------------------*/
|
|
#if defined(__MSP430__) && defined(__GNUC__) && MSP430_MEMCPY_WORKAROUND
|
|
void *
|
|
w_memset(void *out, int value, size_t n)
|
|
{
|
|
uint8_t *dest;
|
|
dest = (uint8_t *) out;
|
|
while(n-- > 0) {
|
|
*dest++ = value & 0xff;
|
|
}
|
|
return out;
|
|
}
|
|
#endif /* __GNUC__ && __MSP430__ && MSP430_MEMCPY_WORKAROUND */
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
msp430_init_dco(void)
|
|
{
|
|
if(CALBC1_8MHZ != 0xFF) {
|
|
DCOCTL = 0x00;
|
|
BCSCTL1 = CALBC1_8MHZ; /*Set DCO to 8MHz */
|
|
DCOCTL = CALDCO_8MHZ;
|
|
} else { /*start using reasonable values at 8 Mhz */
|
|
DCOCTL = 0x00;
|
|
BCSCTL1 = 0x8D;
|
|
DCOCTL = 0x88;
|
|
}
|
|
|
|
/*BCSCTL1 |= XT2OFF; // Make sure XT2 is off */
|
|
/* BCSCTL2 = 0x00; // MCLK = DCOCLK/1 */
|
|
/* SMCLK = DCOCLK/1 */
|
|
/* DCO Internal Resistor */
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/*---------------------------------------------------------------------------*/
|
|
/* Start CPU with full speed (? good or bad?) and go downwards */
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
msp430_quick_synch_dco(void) {
|
|
uint16_t last;
|
|
uint16_t diff;
|
|
uint16_t dco_reg = 0x0fff;
|
|
uint8_t current_bit = 12;
|
|
uint16_t i;
|
|
/* DELTA_2 assumes an ACLK of 32768 Hz */
|
|
#define DELTA_2 ((MSP430_CPU_SPEED) / 32768)
|
|
|
|
/* Select SMCLK clock, and capture on ACLK for TBCCR6 */
|
|
TBCTL = TBSSEL1 | TBCLR;
|
|
TBCCTL6 = CCIS0 + CM0 + CAP;
|
|
/* start the timer */
|
|
TBCTL |= MC1;
|
|
|
|
BCSCTL1 = 0x8D | 7;
|
|
DCOCTL = 0xff; /* MAX SPEED ?? */
|
|
|
|
/* IDEA: do binary search - check MSB first, etc... */
|
|
/* 1 set current bit to zero - if to slow, put back to 1 */
|
|
while(current_bit--) {
|
|
/* first set the current bit to zero and check - we know that it is
|
|
set from start so ^ works (first bit = bit 11) */
|
|
dco_reg = dco_reg ^ (1 << current_bit); /* clear bit 11..10..9.. */
|
|
|
|
/* set dco registers */
|
|
DCOCTL = dco_reg & 0xff;
|
|
BCSCTL1 = (BCSCTL1 & 0xf8) | (dco_reg >> 8);
|
|
|
|
/* some delay to make clock stable - could possibly be made using
|
|
captures too ... */
|
|
for(i=0; i < 1000; i++) {
|
|
i = i | 1;
|
|
}
|
|
|
|
|
|
/* do capture... */
|
|
while(!(TBCCTL6 & CCIFG));
|
|
last = TBCCR6;
|
|
|
|
TBCCTL6 &= ~CCIFG;
|
|
/* wait for next Capture - and calculate difference */
|
|
while(!(TBCCTL6 & CCIFG));
|
|
diff = TBCCR6 - last;
|
|
|
|
/* /\* store what was run during the specific test *\/ */
|
|
/* dcos[current_bit] = dco_reg; */
|
|
/* vals[current_bit] = diff; */
|
|
|
|
/* should we keep the bit cleared or not ? */
|
|
if (diff < DELTA_2) { /* DCO is too slow - fewer ticks than desired */
|
|
/* toggle bit again to get it back to one */
|
|
dco_reg = dco_reg ^ (1 << current_bit);
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
msp430_init_dco_old(void) /*Enric NOT IN USE, RIGHT NOW */
|
|
{
|
|
/* This code taken from the FU Berlin sources and reformatted. */
|
|
#define DELTA ((MSP430_CPU_SPEED) / (32768 / 8))
|
|
|
|
unsigned int compare, oldcapture = 0;
|
|
unsigned int i;
|
|
|
|
|
|
BCSCTL1 = 0xa4; /* ACLK is devided by 4. RSEL=6 no division for MCLK
|
|
and SSMCLK. XT2 is off. */
|
|
|
|
BCSCTL2 = 0x00; /* Init FLL to desired frequency using the 32762Hz
|
|
crystal DCO frquenzy = 2,4576 MHz */
|
|
|
|
BCSCTL1 |= DIVA1 + DIVA0; /* ACLK = LFXT1CLK/8 */
|
|
for(i = 0xffff; i > 0; i--) { /* Delay for XTAL to settle */
|
|
asm("nop");
|
|
}
|
|
|
|
CCTL2 = CCIS0 + CM0 + CAP; /* Define CCR2, CAP, ACLK */
|
|
TACTL = TASSEL1 + TACLR + MC1; // SMCLK, continous mode
|
|
|
|
|
|
while(1) {
|
|
|
|
while((CCTL2 & CCIFG) != CCIFG); /* Wait until capture occured! */
|
|
CCTL2 &= ~CCIFG; /* Capture occured, clear flag */
|
|
compare = CCR2; /* Get current captured SMCLK */
|
|
compare = compare - oldcapture; /* SMCLK difference */
|
|
oldcapture = CCR2; /* Save current captured SMCLK */
|
|
|
|
if(DELTA == compare) {
|
|
break; /* if equal, leave "while(1)" */
|
|
} else if(DELTA < compare) { /* DCO is too fast, slow it down */
|
|
DCOCTL--;
|
|
if(DCOCTL == 0xFF) { /* Did DCO role under? */
|
|
BCSCTL1--;
|
|
}
|
|
} else { /* -> Select next lower RSEL */
|
|
DCOCTL++;
|
|
if(DCOCTL == 0x00) { /* Did DCO role over? */
|
|
BCSCTL1++;
|
|
}
|
|
/* -> Select next higher RSEL */
|
|
}
|
|
}
|
|
|
|
CCTL2 = 0; /* Stop CCR2 function */
|
|
TACTL = 0; /* Stop Timer_A */
|
|
|
|
BCSCTL1 &= ~(DIVA1 + DIVA0); /* remove /8 divisor from ACLK again */
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
|
|
static void
|
|
init_ports(void)
|
|
{
|
|
/* Turn everything off, device drivers enable what is needed. */
|
|
|
|
/* All configured for digital I/O */
|
|
#ifdef P1SEL
|
|
P1SEL = 0;
|
|
#endif
|
|
#ifdef P2SEL
|
|
P2SEL = 0;
|
|
#endif
|
|
#ifdef P3SEL
|
|
P3SEL = 0;
|
|
#endif
|
|
#ifdef P4SEL
|
|
P4SEL = 0;
|
|
#endif
|
|
#ifdef P5SEL
|
|
P5SEL = 0;
|
|
#endif
|
|
#ifdef P6SEL
|
|
P6SEL = 0;
|
|
#endif
|
|
|
|
/* All available inputs */
|
|
#ifdef P1DIR
|
|
P1DIR = 0;
|
|
P1OUT = 0;
|
|
#endif
|
|
#ifdef P2DIR
|
|
P2DIR = 0;
|
|
P2OUT = 0;
|
|
#endif
|
|
#ifdef P3DIR
|
|
P3DIR = 0;
|
|
P3OUT = 0;
|
|
#endif
|
|
#ifdef P4DIR
|
|
P4DIR = 0;
|
|
P4OUT = 0;
|
|
#endif
|
|
|
|
#ifdef P5DIR
|
|
P5DIR = 0;
|
|
P5OUT = 0;
|
|
#endif
|
|
|
|
#ifdef P6DIR
|
|
P6DIR = 0;
|
|
P6OUT = 0;
|
|
#endif
|
|
|
|
P1IE = 0;
|
|
P2IE = 0;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/* msp430-ld may align _end incorrectly. Workaround in cpu_init. */
|
|
extern int _end; /* Not in sys/unistd.h */
|
|
static char *cur_break = (char *)&_end;
|
|
|
|
void
|
|
msp430_cpu_init(void)
|
|
{
|
|
dint();
|
|
watchdog_init();
|
|
init_ports();
|
|
msp430_quick_synch_dco();
|
|
eint();
|
|
if((uintptr_t)cur_break & 1) { /* Workaround for msp430-ld bug! */
|
|
cur_break++;
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
#define asmv(arg) __asm__ __volatile__(arg)
|
|
|
|
#define STACK_EXTRA 32
|
|
|
|
/*
|
|
* Allocate memory from the heap. Check that we don't collide with the
|
|
* stack right now (some other routine might later). A watchdog might
|
|
* be used to check if cur_break and the stack pointer meet during
|
|
* runtime.
|
|
*/
|
|
void *
|
|
sbrk(int incr)
|
|
{
|
|
char *stack_pointer;
|
|
|
|
asmv("mov r1, %0" : "=r" (stack_pointer));
|
|
stack_pointer -= STACK_EXTRA;
|
|
if(incr > (stack_pointer - cur_break))
|
|
return (void *)-1; /* ENOMEM */
|
|
|
|
void *old_break = cur_break;
|
|
cur_break += incr;
|
|
/*
|
|
* If the stack was never here then [old_break .. cur_break] should
|
|
* be filled with zeros.
|
|
*/
|
|
return old_break;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/*
|
|
* Mask all interrupts that can be masked.
|
|
*/
|
|
int
|
|
splhigh_(void)
|
|
{
|
|
/* Clear the GIE (General Interrupt Enable) flag. */
|
|
int sr;
|
|
asmv("mov r2, %0" : "=r" (sr));
|
|
asmv("bic %0, r2" : : "i" (GIE));
|
|
return sr & GIE; /* Ignore other sr bits. */
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/*
|
|
* Restore previous interrupt mask.
|
|
*/
|
|
void
|
|
splx_(int sr)
|
|
{
|
|
/* If GIE was set, restore it. */
|
|
asmv("bis %0, r2" : : "r" (sr));
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/* this code will always start the TimerB if not already started */
|
|
void
|
|
msp430_sync_dco(void) {
|
|
uint16_t last;
|
|
uint16_t diff;
|
|
/* uint32_t speed; */
|
|
/* DELTA_2 assumes an ACLK of 32768 Hz */
|
|
#define DELTA_2 ((MSP430_CPU_SPEED) / 32768)
|
|
|
|
/* Select SMCLK clock, and capture on ACLK for TBCCR6 */
|
|
TBCTL = TBSSEL1 | TBCLR;
|
|
TBCCTL6 = CCIS0 + CM0 + CAP;
|
|
/* start the timer */
|
|
TBCTL |= MC1;
|
|
|
|
/* wait for next Capture */
|
|
TBCCTL6 &= ~CCIFG;
|
|
while(!(TBCCTL6 & CCIFG));
|
|
last = TBCCR6;
|
|
|
|
TBCCTL6 &= ~CCIFG;
|
|
/* wait for next Capture - and calculate difference */
|
|
while(!(TBCCTL6 & CCIFG));
|
|
diff = TBCCR6 - last;
|
|
|
|
/* Stop timer - conserves energy according to user guide */
|
|
TBCTL = 0;
|
|
|
|
/* speed = diff; */
|
|
/* speed = speed * 32768; */
|
|
/* printf("Last TAR diff:%d target: %ld ", diff, DELTA_2); */
|
|
/* printf("CPU Speed: %lu DCOCTL: %d\n", speed, DCOCTL); */
|
|
|
|
/* resynchronize the DCO speed if not at target */
|
|
if(DELTA_2 < diff) { /* DCO is too fast, slow it down */
|
|
DCOCTL--;
|
|
if(DCOCTL == 0xFF) { /* Did DCO role under? */
|
|
BCSCTL1--;
|
|
}
|
|
} else if (DELTA_2 > diff) {
|
|
DCOCTL++;
|
|
if(DCOCTL == 0x00) { /* Did DCO role over? */
|
|
BCSCTL1++;
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|