Adding MS/TP demo for ATmega168. Not finished yet.

2007-08-15 00:12:19 +00:00
parent 53bc0932ad
commit 1b364d6df1
9 changed files with 531 additions and 0 deletions
@@ -0,0 +1,60 @@
+/**************************************************************************
+*
+* Copyright (C) 2007 Steve Karg <skarg@users.sourceforge.net>
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*
+*********************************************************************/
+
+#include "hardware.h"
+
+/* Prescaling: 1, 8, 64, 256, 1024 */
+#define TIMER_1_PRESCALER 1
+/* Count: Timer counts up to 0xFFFF and then signals overflow */
+#define TIMER_1_TICKS (FREQ_CPU/TIMER_1_PRESCALER/1000)
+#define TIMER_1_COUNT (0xFFFF-TIMER_1_TICKS)
+/* Global variable millisecond timer - used by main.c for timers task */
+volatile uint8_t Timer_Milliseconds = 0;
+
+/* Configure the Timer */
+void timer_initialize(void)
+{
+    /* Normal Operation */
+    TCCR1A = 0;
+    /* CS10 = clkI/O/1 (No prescaling) */
+    TCCR1B = _BV(CS10);
+    /* Clear any TOV1 Flag set when the timer overflowed */
+    BIT_CLEAR(TIFR1,TOV1);
+    /* Initial value */
+    TCNT1 = TIMER_1_COUNT;
+    /* Enable the overflow interrupt */
+    BIT_SET(TIMSK1,TOIE1);
+}
+
+
+/* Timer Overflowed!  Increment the time. */
+ISR(TIMER1_OVF_vect)
+{
+    /* Set the counter for the next interrupt */
+    TCNT1 = TIMER_1_COUNT;
+    /* Overflow Flag is automatically cleared */
+    if (Timer_Milliseconds < 0xFF)
+       Timer_Milliseconds++;
+}