Contiki port for the Atmel AVR Raven board

2008-10-14 09:40:30 +00:00 · 2008-10-14 09:40:30 +00:00 · 0a961b2ada
commit 0a961b2ada
parent 3f394fe927
42 changed files with 5646 additions and 0 deletions
--- a/platform/avr-ravenlcd/timer.c
+++ b/platform/avr-ravenlcd/timer.c
@ -0,0 +1,113 @@
+/*
+ *  Copyright (c) 2008  Swedish Institute of Computer Science
+ *  All rights reserved.
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name of the copyright holders nor the names of
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * \file
+ *
+ * \brief
+ *      This file will configure the timer during LCD operation.
+ *
+ * \author
+ *      Mike Vidales mavida404@gmail.com
+ *
+ */
+
+#include "lcd.h"
+#include "timer.h"
+
+/**
+ *  \addtogroup lcd
+ *  \{
+*/
+
+bool timer_flag;
+
+/*---------------------------------------------------------------------------*/
+
+/**
+ *   \brief TIMER1 init for timer used by LCD.
+ *
+ *   The FPU of 8MHz with a prescaler of 1024 equals 7812.5 timer ticks creating a
+ *   resolution of 128us per tick.
+ *
+ *   NOTE: The TIMER1 interrupt is not enabled in this routine
+*/
+void
+timer_init(void)
+{
+    /*
+     * Set TIMER1 output compare mode to clear on compare match for OC1A. Also
+     * set the pre-scaler to 1024.
+     */
+    TCCR1B = (1 << WGM12)|(1 << CS12)|(1 << CS10);
+
+    /* Set TIMER1 output compare register approx. 1 sec resolution. */
+    OCR1A = _1_SEC;
+}
+
+/*---------------------------------------------------------------------------*/
+
+/**
+ *   \brief Start the timer.
+*/
+void
+timer_start(void)
+{
+    /* Clear TIMER1 timer counter value. */
+    TCNT1 = 0;
+
+    /* Enable TIMER1 output compare interrupt. */
+    TIMSK1 = (1 << OCIE1A);
+}
+
+/*---------------------------------------------------------------------------*/
+
+/**
+ *   \brief Stop the timer.
+*/
+void
+timer_stop(void)
+{
+    /* Disable TIMER1 output compare interrupt. */
+    TIMSK1 &= ~(1 << OCIE1A);
+}
+
+/*---------------------------------------------------------------------------*/
+
+/**
+ *   \brief This is the interrupt subroutine for the TIMER1 output match comparison.
+*/
+ISR
+(TIMER1_COMPA_vect)
+{
+    /* Set the irq flag. */
+    timer_flag = true;
+}
+
+/** \}   */