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120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
/******************************************************************************
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Copyright (C) 2013, Freie Universitaet Berlin (FUB). All rights reserved.
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These sources were developed at the Freie Universitaet Berlin, Computer Systems
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and Telematics group (http://cst.mi.fu-berlin.de).
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-------------------------------------------------------------------------------
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This file is subject to the terms and conditions of the GNU Lesser
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General Public License v2.1. See the file LICENSE in the top level
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directory for more details.
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*******************************************************************************/
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#include <stdint.h>
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#include "cpu.h"
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#include "hwtimer.h"
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#include "arch/hwtimer_arch.h"
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#define ENABLE_DEBUG (0)
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#include "debug.h"
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void (*int_handler)(int);
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extern void timerA_init(void);
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volatile uint16_t overflow_interrupt[HWTIMER_MAXTIMERS+1];
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volatile uint16_t timer_round;
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#ifdef CC430
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/* CC430 have "TimerA0", "TimerA1" and so on... */
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#define CNT_CTRL_BASE_REG (TA0CCTL0)
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#define CNT_COMP_BASE_REG (TA0CCR0)
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#define TIMER_VAL_REG (TA0R)
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#else
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/* ... while other MSP430 MCUs have "TimerA", "TimerB".
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Cheers for TI and its consistency! */
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#define CNT_CTRL_BASE_REG (TACCTL0)
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#define CNT_COMP_BASE_REG (TACCR0)
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#define TIMER_VAL_REG (TAR)
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#endif
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static void timer_disable_interrupt(short timer)
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{
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volatile unsigned int *ptr = &CNT_CTRL_BASE_REG + (timer);
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*ptr &= ~(CCIFG);
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*ptr &= ~(CCIE);
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}
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static void timer_enable_interrupt(short timer)
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{
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volatile unsigned int *ptr = &CNT_CTRL_BASE_REG + (timer);
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*ptr |= CCIE;
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*ptr &= ~(CCIFG);
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}
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static void timer_set_nostart(uint32_t value, short timer)
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{
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volatile unsigned int *ptr = &CNT_COMP_BASE_REG + (timer);
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/* ensure we won't set the timer to a "past" tick */
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if (value <= hwtimer_arch_now()) {
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value = hwtimer_arch_now() + 2;
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}
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overflow_interrupt[timer] = (uint16_t)(value >> 16);
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*ptr = (value & 0xFFFF);
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}
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static void timer_set(uint32_t value, short timer)
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{
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DEBUG("Setting timer %u to %lu\n", timer, value);
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timer_set_nostart(value, timer);
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timer_enable_interrupt(timer);
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}
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void timer_unset(short timer)
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{
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volatile unsigned int *ptr = &CNT_COMP_BASE_REG + (timer);
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timer_disable_interrupt(timer);
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*ptr = 0;
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}
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unsigned long hwtimer_arch_now(void)
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{
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return ((uint32_t)timer_round << 16) + TIMER_VAL_REG;
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}
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void hwtimer_arch_init(void (*handler)(int), uint32_t fcpu)
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{
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(void) fcpu;
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timerA_init();
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int_handler = handler;
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}
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void hwtimer_arch_enable_interrupt(void)
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{
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for (int i = 0; i < HWTIMER_MAXTIMERS; i++) {
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timer_enable_interrupt(i);
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}
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}
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void hwtimer_arch_disable_interrupt(void)
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{
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for (int i = 0; i < HWTIMER_MAXTIMERS; i++) {
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timer_disable_interrupt(i);
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}
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}
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void hwtimer_arch_set(unsigned long offset, short timer)
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{
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uint32_t value = hwtimer_arch_now() + offset;
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hwtimer_arch_set_absolute(value, timer);
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}
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void hwtimer_arch_set_absolute(unsigned long value, short timer)
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{
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timer_set(value, timer);
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}
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void hwtimer_arch_unset(short timer)
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{
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timer_unset(timer);
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}
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