LPC2xxx: add timer support.

[bertos.git] / bertos / cpu / arm / drv / timer_lpc2.h

diff --git a/bertos/cpu/arm/drv/timer_lpc2.h b/bertos/cpu/arm/drv/timer_lpc2.h
new file mode 100644 (file)
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+++ b/bertos/cpu/arm/drv/timer_lpc2.h
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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \author Francesco Sacchi <batt@develer.com>
+ *
+ * \brief Low-level timer module for NXP LPC2xxx (interface).
+ */
+
+#ifndef DRV_LPC2_TIMER_H
+#define DRV_LPC2_TIMER_H
+
+#include <hw/hw_cpufreq.h>     /* CPU_FREQ */
+
+#include "cfg/cfg_timer.h"     /* CONFIG_TIMER */
+#include <cfg/compiler.h>      /* uint8_t */
+#include <cfg/macros.h>        /* BV */
+
+#include <io/lpc23xx.h>
+
+/**
+ * \name Values for CONFIG_TIMER.
+ *
+ * Select which hardware timer interrupt to use for system clock and softtimers.
+ *
+ * $WIZ$ timer_select = "TIMER0_COMPARE0", "TIMER_DEFAULT"
+ */
+#define TIMER0_COMPARE0 0  ///< System timer on Timer0 Compare match0
+
+#define TIMER_DEFAULT TIMER0_COMPARE0  ///< Default system timer
+
+/*
+ * Hardware dependent timer initialization.
+ */
+#if (CONFIG_TIMER == TIMER0_COMPARE0)
+       ISR_PROTO_CONTEXT_SWITCH(timer_handler);
+       #define DEFINE_TIMER_ISR     DECLARE_ISR_CONTEXT_SWITCH(timer_handler)
+
+       #define TIMER_TICKS_PER_SEC  1000
+       #define TIMER_HW_CNT         (CPU_FREQ / TIMER_TICKS_PER_SEC - 1)
+
+       /** Frequency of the hardware high-precision timer. */
+       #define TIMER_HW_HPTICKS_PER_SEC (CPU_FREQ)
+
+       /** Type of time expressed in ticks of the hardware high-precision timer */
+       typedef uint32_t hptime_t;
+       #define SIZEOF_HPTIME_T 4
+
+       INLINE void timer_hw_irq(void)
+       {
+               /* Reset The match0 irq flag */
+               T0IR = 0x01;
+               /* Signal the VIC we have completed the ISR */
+               VICVectAddr = 0;        
+       }
+
+       INLINE bool timer_hw_triggered(void)
+       {
+               return true;
+       }
+
+       INLINE hptime_t timer_hw_hpread(void)
+       {
+               return T0TC;
+       }
+
+#else
+
+       #error Unimplemented value for CONFIG_TIMER
+#endif /* CONFIG_TIMER */
+
+void timer_hw_init(void);
+
+
+#endif /* DRV_LPC2_TIMER_H */