From: arighi <arighi@38d2e660-2303-0410-9eaa-f027e97ec537>
Date: Fri, 26 Mar 2010 16:12:44 +0000 (+0000)
Subject: lm3s1968: low-level timer driver (systick).
X-Git-Tag: 2.5.0~624
X-Git-Url: https://codewiz.org/gitweb?a=commitdiff_plain;h=bd4c9a2c047db476ac34649ccf16970ad34343ce;p=bertos.git

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
index 00000000..70135694
--- /dev/null
+++ b/bertos/cpu/cortex-m3/drv/timer.c
@@ -0,0 +1,80 @@
+/**
+ * \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
index 00000000..53fdd02f
--- /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 */