From 00645113e57fdb1ce0f06f4d476004cc110048a7 Mon Sep 17 00:00:00 2001 From: adamdunkels Date: Tue, 3 Apr 2007 19:03:09 +0000 Subject: [PATCH] MSP430 real-time rtimer support using timerb1 --- cpu/msp430/rtimer-arch.c | 99 ++++++++++++++++++++++++++++++++++++++++ cpu/msp430/rtimer-arch.h | 46 +++++++++++++++++++ 2 files changed, 145 insertions(+) create mode 100644 cpu/msp430/rtimer-arch.c create mode 100644 cpu/msp430/rtimer-arch.h diff --git a/cpu/msp430/rtimer-arch.c b/cpu/msp430/rtimer-arch.c new file mode 100644 index 000000000..3b17f800a --- /dev/null +++ b/cpu/msp430/rtimer-arch.c @@ -0,0 +1,99 @@ +/* + * Copyright (c) 2007, 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: rtimer-arch.c,v 1.1 2007/04/03 19:03:09 adamdunkels Exp $ + */ + +/** + * \file + * Native (non-specific) code for the Contiki real-time module rt + * \author + * Adam Dunkels + */ + +#include +#include + +#include "sys/rtimer.h" + +#define DEBUG 0 +#if DEBUG +#include +#define PRINTF(...) printf(__VA_ARGS__) +#else +#define PRINTF(...) +#endif + +/*---------------------------------------------------------------------------*/ +interrupt(TIMERB1_VECTOR) timerb1 (void) { + if(TBIV == 2) { + rtimer_run_next(); + } +} +/*---------------------------------------------------------------------------*/ +void +rtimer_arch_init(void) +{ + dint(); + + /* Select SMCLK (2.4576MHz), clear TAR */ + /* TACTL = TASSEL1 | TACLR | ID_3; */ + /* Select ACLK 32768Hz clock, divide by 8 */ + TBCTL = TBSSEL0 | TBCLR | ID_3; + + /* Initialize ccr1 to create the X ms interval. */ + /* CCR1 interrupt enabled, interrupt occurs when timer equals CCR1. */ + TBCCTL1 = CCIE; + + /* Interrupt after X ms. */ + /* TBCCR1 = INTERVAL;*/ + + /* Start Timer_A in continuous mode. */ + TBCTL |= MC1; + + BCSCTL1 &= ~(DIVA1 + DIVA0); /* remove /8 divisor from ACLK again */ + + /* Enable interrupts. */ + eint(); +} +/*---------------------------------------------------------------------------*/ +void +rtimer_arch_schedule(rtimer_clock_t t) +{ + PRINTF("rtimer_arch_schedule time %u\n", t); + TBCCR1 = t; +} +/*---------------------------------------------------------------------------*/ +rtimer_clock_t +rtimer_arch_now(void) +{ + return TBCCR1; +} +/*---------------------------------------------------------------------------*/ diff --git a/cpu/msp430/rtimer-arch.h b/cpu/msp430/rtimer-arch.h new file mode 100644 index 000000000..2ae8d718d --- /dev/null +++ b/cpu/msp430/rtimer-arch.h @@ -0,0 +1,46 @@ +/* + * Copyright (c) 2007, 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: rtimer-arch.h,v 1.1 2007/04/03 19:03:10 adamdunkels Exp $ + */ + +/** + * \file + * A brief description of what this file is. + * \author + * Adam Dunkels + */ + +#ifndef __RTIMER_ARCH_H__ +#define __RTIMER_ARCH_H__ + +#define RTIMER_ARCH_SECOND 4096 + +#endif /* __RTIMER_ARCH_H__ */