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87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/*
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* Copyright (C) 2011 by Matthias Ringwald
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
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* RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/*
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* hal_tick.c
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*
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* Implementation for MSP430 Experimenter board using 250 ms ticks provided by Timer A1
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*
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*/
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#include <msp430x54x.h>
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#include <stdlib.h>
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#include "hal_compat.h"
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#include <btstack/hal_tick.h>
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static void dummy_handler(void){};
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static void (*tick_handler)(void) = &dummy_handler;
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// Auxillary Clock (ACLK) = 32768 hz
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// 8192 ticks = 1/4 second
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#define TIMER_COUNTDOWN 8192
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void hal_tick_init(void){
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TA1CCTL0 = CCIE; // CCR0 interrupt enabled
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TA1CTL = TASSEL_1 | MC_2 | TACLR; // use ACLK (32768), contmode, clear TAR
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TA1CCR0 = TIMER_COUNTDOWN; // -> 1/4 s
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}
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void hal_tick_set_handler(void (*handler)(void)){
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if (handler == NULL){
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tick_handler = &dummy_handler;
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return;
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}
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tick_handler = handler;
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}
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int hal_tick_get_tick_period_in_ms(void){
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return 250;
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}
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// Timer A1 interrupt service routine
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#ifdef __GNUC__
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__attribute__((interrupt(TIMER1_A0_VECTOR)))
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#endif
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#ifdef __IAR_SYSTEMS_ICC__
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#pragma vector=TIMER1_A0_VECTOR
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__interrupt
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#endif
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void timerA0ISR(void){
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TA1CCR0 += TIMER_COUNTDOWN;
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(*tick_handler)();
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// force exit low power mode
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__bic_SR_register_on_exit(LPM0_bits); // Exit active CPU
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}
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