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29 * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
33 * \author Francesco Sacchi <batt@develer.com>
35 * \brief Low-level timer module for NXP LPC2xxx (interface).
38 #ifndef DRV_LPC2_TIMER_H
39 #define DRV_LPC2_TIMER_H
41 #include <hw/hw_cpufreq.h> /* CPU_FREQ */
43 #include "cfg/cfg_timer.h" /* CONFIG_TIMER */
44 #include <cfg/compiler.h> /* uint8_t */
45 #include <cfg/macros.h> /* BV */
47 #include <io/lpc23xx.h>
50 * \name Values for CONFIG_TIMER.
52 * Select which hardware timer interrupt to use for system clock and softtimers.
54 * $WIZ$ timer_select = "TIMER0_COMPARE0", "TIMER_DEFAULT"
56 #define TIMER0_COMPARE0 0 ///< System timer on Timer0 Compare match0
58 #define TIMER_DEFAULT TIMER0_COMPARE0 ///< Default system timer
61 * Hardware dependent timer initialization.
63 #if (CONFIG_TIMER == TIMER0_COMPARE0)
64 ISR_PROTO_CONTEXT_SWITCH(timer_handler);
65 #define DEFINE_TIMER_ISR DECLARE_ISR_CONTEXT_SWITCH(timer_handler)
67 #define TIMER_TICKS_PER_SEC 1000
68 #define TIMER_HW_CNT (CPU_FREQ / TIMER_TICKS_PER_SEC - 1)
70 /** Frequency of the hardware high-precision timer. */
71 #define TIMER_HW_HPTICKS_PER_SEC (CPU_FREQ)
73 /** Type of time expressed in ticks of the hardware high-precision timer */
74 typedef uint32_t hptime_t;
75 #define SIZEOF_HPTIME_T 4
77 INLINE void timer_hw_irq(void)
79 /* Reset The match0 irq flag */
81 /* Signal the VIC we have completed the ISR */
85 INLINE bool timer_hw_triggered(void)
90 INLINE hptime_t timer_hw_hpread(void)
97 #error Unimplemented value for CONFIG_TIMER
98 #endif /* CONFIG_TIMER */
100 void timer_hw_init(void);
103 #endif /* DRV_LPC2_TIMER_H */