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29 * Copyright 2007 Develer S.r.l. (http://www.develer.com/)
35 * \author Francesco Sacchi <batt@develer.com>
37 * \brief Low-level timer module for Atmel AT91 (inplementation).
40 #include "timer_at91.h"
42 #include "sysirq_at91.h"
44 #include <cfg/macros.h> // BV()
45 #include <cfg/module.h>
47 #include <cpu/types.h>
50 /** HW dependent timer initialization */
51 #if (CONFIG_TIMER == TIMER_ON_PIT)
52 INLINE void timer_hw_irq(void)
54 /* Reset counters, this is needed to reset timer and interrupt flags */
55 uint32_t dummy = PIVR;
59 INLINE bool timer_hw_triggered(void)
61 return PIT_SR & BV(PITS);
64 INLINE void timer_hw_init(void)
72 IRQ_SAVE_DISABLE(flags);
74 PIT_MR = TIMER_HW_CNT;
75 /* Register system interrupt handler. */
76 sysirq_setHandler(SYSIRQ_PIT, timer_handler);
78 /* Enable interval timer and interval timer interrupts */
80 sysirq_setEnable(SYSIRQ_PIT, true);
82 /* Reset counters, this is needed to start timer and interrupt flags */
83 uint32_t dummy = PIVR;
89 INLINE hptime_t timer_hw_hpread(void)
91 /* In the upper part of PIT_PIIR there is unused data */
92 return PIIR & CPIV_MASK;
96 #error Unimplemented value for CONFIG_TIMER
97 #endif /* CONFIG_TIMER */