4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
33 * \author Andrea Righi <arighi@develer.com>
35 * \brief Low-level timer driver (SysTick) for Cortex-M3.
41 #include "cfg/cfg_timer.h" /* CONFIG_TIMER */
47 /*#elif Add other families here */
53 * \name Values for CONFIG_TIMER.
55 * Select which hardware timer interrupt to use for system clock and softtimers.
57 * $WIZ$ timer_select = "TIMER_DEFAULT", "TIMER_ON_GPTM"
59 #define TIMER_ON_GPTM 1
61 #define TIMER_DEFAULT TIMER_ON_GPTM ///< Default system timer
63 #if (CONFIG_TIMER == TIMER_ON_GPTM)
64 /* Ticks frequency (HZ) */
65 #define TIMER_TICKS_PER_SEC 1000
67 /* Frequency of the hardware high-precision timer. */
68 #define TIMER_HW_HPTICKS_PER_SEC (CPU_FREQ)
70 /* Maximum value of the high-precision hardware counter register */
71 #define TIMER_HW_CNT (CPU_FREQ / TIMER_TICKS_PER_SEC)
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 /* Timer ISR prototype */
78 ISR_PROTO_CONTEXT_SWITCH(timer_handler);
79 #define DEFINE_TIMER_ISR DECLARE_ISR_CONTEXT_SWITCH(timer_handler)
81 INLINE void timer_hw_irq(void)
86 INLINE bool timer_hw_triggered(void)
91 INLINE hptime_t timer_hw_hpread(void)
93 return (TIMER_HW_CNT - NVIC_ST_CURRENT_R);
98 #error Unimplemented value for CONFIG_TIMER
99 #endif /* CONFIG_TIMER */
101 void timer_hw_init(void);
102 void timer_hw_exit(void);
104 #endif /* TIMER_CM3_H */