lm3s1968: low-level timer driver (systick).

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@3279 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/bertos/cpu/cortex-m3/drv/timer.c b/bertos/cpu/cortex-m3/drv/timer.c
new file mode 100644 (file)
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--- /dev/null
+++ b/bertos/cpu/cortex-m3/drv/timer.c
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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/)
+ *
+ * -->
+ *
+ * \brief Low-level timer driver for LM3S1968.
+ *
+ * \author Andrea Righi <arighi@develer.com>
+ */
+
+#include <cfg/debug.h>
+#include <cpu/irq.h>
+#include "io/lm3s.h"
+
+#include "irq.h"
+#include "timer.h"
+
+unsigned long ticks;
+
+INLINE void timer_hw_setPeriod(unsigned long period)
+{
+       ASSERT(period < (1 << 24));
+       HWREG(NVIC_ST_RELOAD) = period;
+}
+
+static void timer_hw_handler(void)
+{
+       ticks++;
+}
+
+static void timer_hw_enable(void)
+{
+       HWREG(NVIC_ST_CTRL) |=
+               NVIC_ST_CTRL_CLK_SRC | NVIC_ST_CTRL_ENABLE | NVIC_ST_CTRL_INTEN;
+}
+
+static void timer_hw_disable(void)
+{
+       HWREG(NVIC_ST_CTRL) &= ~(NVIC_ST_CTRL_ENABLE | NVIC_ST_CTRL_INTEN);
+}
+
+void timer_hw_init(void)
+{
+       timer_hw_setPeriod(100000);
+       sysirq_setHandler(FAULT_SYSTICK, timer_hw_handler);
+       timer_hw_enable();
+}
+
+void timer_hw_exit(void)
+{
+       timer_hw_disable();
+       sysirq_freeHandler(FAULT_SYSTICK);
+}

diff --git a/bertos/cpu/cortex-m3/drv/timer.h b/bertos/cpu/cortex-m3/drv/timer.h
new file mode 100644 (file)
index 0000000..53fdd02
--- /dev/null
+++ b/bertos/cpu/cortex-m3/drv/timer.h
@@ -0,0 +1,44 @@
+/**
+ * \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/)
+ *
+ * -->
+ *
+ * \brief Low-level timer driver for LM3S1968.
+ *
+ * \author Andrea Righi <arighi@develer.com>
+ */
+
+#ifndef DRV_CORTEX_M3_TIMER_H
+#define DRV_CORTEX_M3_TIMER_H
+
+void timer_hw_init(void);
+void timer_hw_exit(void);
+
+#endif /* DRV_CORTEX_M3_TIMER_H */