2 FreeRTOS.org V5.0.2 - Copyright (C) 2003-2008 Richard Barry.
\r
4 This file is part of the FreeRTOS.org distribution.
\r
6 FreeRTOS.org is free software; you can redistribute it and/or modify
\r
7 it under the terms of the GNU General Public License as published by
\r
8 the Free Software Foundation; either version 2 of the License, or
\r
9 (at your option) any later version.
\r
11 FreeRTOS.org is distributed in the hope that it will be useful,
\r
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
\r
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\r
14 GNU General Public License for more details.
\r
16 You should have received a copy of the GNU General Public License
\r
17 along with FreeRTOS.org; if not, write to the Free Software
\r
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
\r
20 A special exception to the GPL can be applied should you wish to distribute
\r
21 a combined work that includes FreeRTOS.org, without being obliged to provide
\r
22 the source code for any proprietary components. See the licensing section
\r
23 of http://www.FreeRTOS.org for full details of how and when the exception
\r
26 ***************************************************************************
\r
27 ***************************************************************************
\r
29 * SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *
\r
30 * and even write all or part of your application on your behalf. *
\r
31 * See http://www.OpenRTOS.com for details of the services we provide to *
\r
32 * expedite your project. *
\r
34 ***************************************************************************
\r
35 ***************************************************************************
\r
37 Please ensure to read the configuration and relevant port sections of the
\r
38 online documentation.
\r
40 http://www.FreeRTOS.org - Documentation, latest information, license and
\r
43 http://www.SafeRTOS.com - A version that is certified for use in safety
\r
46 http://www.OpenRTOS.com - Commercial support, development, porting,
\r
47 licensing and training services.
\r
52 + ISRcode is pulled inline and portTICKisr() is therefore
\r
53 deleted from this file.
\r
55 + Prescaler logic for Timer1 added to allow for a wider
\r
61 #include <FreeRTOS.h>
\r
64 /* IO port constants. */
\r
65 #define portBIT_SET (1)
\r
66 #define portBIT_CLEAR (0)
\r
69 * Hardware setup for the tick.
\r
70 * We use a compare match on timer1. Depending on MPU-frequency
\r
71 * and requested tickrate, a prescaled value with a matching
\r
72 * prescaler are determined.
\r
74 #define portTIMER_COMPARE_BASE ((APROCFREQ/4)/configTICK_RATE_HZ)
\r
76 #if portTIMER_COMPARE_BASE < 0x10000
\r
77 #define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE)
\r
78 #define portTIMER_COMPARE_PS1 (portBIT_CLEAR)
\r
79 #define portTIMER_COMPARE_PS0 (portBIT_CLEAR)
\r
80 #elif portTIMER_COMPARE_BASE < 0x20000
\r
81 #define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 2)
\r
82 #define portTIMER_COMPARE_PS1 (portBIT_CLEAR)
\r
83 #define portTIMER_COMPARE_PS0 (portBIT_SET)
\r
84 #elif portTIMER_COMPARE_BASE < 0x40000
\r
85 #define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 4)
\r
86 #define portTIMER_COMPARE_PS1 (portBIT_SET)
\r
87 #define portTIMER_COMPARE_PS0 (portBIT_CLEAR)
\r
88 #elif portTIMER_COMPARE_BASE < 0x80000
\r
89 #define portTIMER_COMPARE_VALUE (portTIMER_COMPARE_BASE / 8)
\r
90 #define portTIMER_COMPARE_PS1 (portBIT_SET)
\r
91 #define portTIMER_COMPARE_PS0 (portBIT_SET)
\r
93 #error "TickRate out of range"
\r
96 /*-----------------------------------------------------------*/
\r
99 * Setup a timer for a regular tick.
\r
101 void portSetupTick( void )
\r
104 * Interrupts are disabled when this function is called.
\r
109 * Provide the tick interrupt using a compare match on timer1.
\r
113 * Set the compare match value.
\r
115 CCPR1H = ( unsigned portCHAR ) ( ( portTIMER_COMPARE_VALUE >> 8 ) & 0xff );
\r
116 CCPR1L = ( unsigned portCHAR ) ( portTIMER_COMPARE_VALUE & 0xff );
\r
119 * Set Compare Special Event Trigger Mode
\r
121 bCCP1M3 = portBIT_SET;
\r
122 bCCP1M2 = portBIT_CLEAR;
\r
123 bCCP1M1 = portBIT_SET;
\r
124 bCCP1M0 = portBIT_SET;
\r
127 * Enable CCP1 interrupt
\r
129 bCCP1IE = portBIT_SET;
\r
132 * We are only going to use the global interrupt bit, so disable
\r
133 * interruptpriorities and enable peripheral interrupts.
\r
135 bIPEN = portBIT_CLEAR;
\r
136 bPEIE = portBIT_SET;
\r
140 * It will produce the system tick.
\r
144 * Clear the time count
\r
146 TMR1H = ( unsigned portCHAR ) 0x00;
\r
147 TMR1L = ( unsigned portCHAR ) 0x00;
\r
152 bRD16 = portBIT_SET; // 16-bit
\r
153 bT1CKPS1 = portTIMER_COMPARE_PS1; // prescaler
\r
154 bT1CKPS0 = portTIMER_COMPARE_PS0; // prescaler
\r
155 bT1OSCEN = portBIT_SET; // Oscillator enable
\r
156 bT1SYNC = portBIT_SET; // No external clock sync
\r
157 bTMR1CS = portBIT_CLEAR; // Internal clock
\r
159 bTMR1ON = portBIT_SET; // Start timer1
\r