osd-contiki/cpu/msp430/f5xxx/msp430.c

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/*
* Copyright (c) 2011, 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.
*/
#include "contiki.h"
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#include "dev/watchdog.h"
/* dco_required set to 1 will cause the CPU not to go into
sleep modes where the DCO clock stopped */
int msp430_dco_required;
#if defined(__MSP430__) && defined(__GNUC__)
#define asmv(arg) __asm__ __volatile__(arg)
#endif
/*---------------------------------------------------------------------------*/
void
msp430_init_dco(void)
{
#ifdef __IAR_SYSTEMS_ICC__
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__bis_SR_register(SCG0);
#else
asmv("bis %0, r2" : : "i" (SCG0));
#endif
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UCSCTL0 = 0x0000;
UCSCTL1 = DCORSEL_4;
UCSCTL2 = MSP430_CPU_SPEED / 32768;
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UCSCTL4 = 0x33; /* instead of 0x44 that is DCO/2 */
#ifdef __IAR_SYSTEMS_ICC__
__bic_SR_register(SCG0);
#else
asmv("bic %0, r2" : : "i" (SCG0));
#endif
}
/*---------------------------------------------------------------------------*/
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
#ifdef P7DIR
P7DIR = 0;
P7OUT = 0;
#endif
#ifdef P8DIR
P8DIR = 0;
P8OUT = 0;
#endif
P1IE = 0;
P2IE = 0;
}
/*---------------------------------------------------------------------------*/
/* msp430-ld may align _end incorrectly. Workaround in cpu_init. */
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#if defined(__MSP430__) && defined(__GNUC__)
extern int _end; /* Not in sys/unistd.h */
static char *cur_break = (char *)&_end;
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#endif
/*---------------------------------------------------------------------------*/
/* add/remove_lpm_req - for requiring a specific LPM mode. currently Contiki */
/* jumps to LPM3 to save power, but DMA will not work if DCO is not clocked */
/* so some modules might need to enter their LPM requirements */
/* NOTE: currently only works with LPM1 (e.g. DCO) requirements. */
/*---------------------------------------------------------------------------*/
void
msp430_add_lpm_req(int req)
{
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if(req <= MSP430_REQUIRE_LPM1) {
msp430_dco_required++;
}
}
void
msp430_remove_lpm_req(int req)
{
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if(req <= MSP430_REQUIRE_LPM1) {
msp430_dco_required--;
}
}
void
msp430_cpu_init(void)
{
dint();
watchdog_init();
init_ports();
msp430_init_dco();
eint();
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#if defined(__MSP430__) && defined(__GNUC__)
if((uintptr_t)cur_break & 1) { /* Workaround for msp430-ld bug! */
cur_break++;
}
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#endif
msp430_dco_required = 0;
}
/*---------------------------------------------------------------------------*/
#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.
*/
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#if defined(__MSP430__) && defined(__GNUC__)
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;
}
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#endif
/*---------------------------------------------------------------------------*/
/*
* Mask all interrupts that can be masked.
*/
int
splhigh_(void)
{
int sr;
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/* Clear the GIE (General Interrupt Enable) flag. */
#ifdef __IAR_SYSTEMS_ICC__
sr = __get_SR_register();
__bic_SR_register(GIE);
#else
asmv("mov r2, %0" : "=r" (sr));
asmv("bic %0, r2" : : "i" (GIE));
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#endif
return sr & GIE; /* Ignore other sr bits. */
}
/*---------------------------------------------------------------------------*/
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#ifdef __IAR_SYSTEMS_ICC__
int __low_level_init(void)
{
/* turn off watchdog so that C-init will run */
WDTCTL = WDTPW + WDTHOLD;
/*
* Return value:
*
* 1 - Perform data segment initialization.
* 0 - Skip data segment initialization.
*/
return 1;
}
#endif
/*---------------------------------------------------------------------------*/