| 1 |
/*********************************************************************
|
| 2 |
*
|
| 3 |
* Tick Manager for PIC18
|
| 4 |
*
|
| 5 |
*********************************************************************
|
| 6 |
* FileName: Tick.c
|
| 7 |
* Dependencies: stackTSK.h
|
| 8 |
* Tick.h
|
| 9 |
* Processor: PIC18
|
| 10 |
* Complier: MCC18 v1.00.50 or higher
|
| 11 |
* HITECH PICC-18 V8.10PL1 or higher
|
| 12 |
* Company: Microchip Technology, Inc.
|
| 13 |
*
|
| 14 |
* Software License Agreement
|
| 15 |
*
|
| 16 |
* The software supplied herewith by Microchip Technology Incorporated
|
| 17 |
* (the “Company”) for its PICmicro® Microcontroller is intended and
|
| 18 |
* supplied to you, the Company’s customer, for use solely and
|
| 19 |
* exclusively on Microchip PICmicro Microcontroller products. The
|
| 20 |
* software is owned by the Company and/or its supplier, and is
|
| 21 |
* protected under applicable copyright laws. All rights are reserved.
|
| 22 |
* Any use in violation of the foregoing restrictions may subject the
|
| 23 |
* user to criminal sanctions under applicable laws, as well as to
|
| 24 |
* civil liability for the breach of the terms and conditions of this
|
| 25 |
* license.
|
| 26 |
*
|
| 27 |
* THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES,
|
| 28 |
* WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED
|
| 29 |
* TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
|
| 30 |
* PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT,
|
| 31 |
* IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
|
| 32 |
* CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
|
| 33 |
*
|
| 34 |
* HiTech PICC18 Compiler Options excluding device selection:
|
| 35 |
* -FAKELOCAL -G -O -Zg -E -C
|
| 36 |
*
|
| 37 |
*
|
| 38 |
*
|
| 39 |
*
|
| 40 |
* Author Date Comment
|
| 41 |
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
| 42 |
* Nilesh Rajbharti 6/28/01 Original (Rev 1.0)
|
| 43 |
* Nilesh Rajbharti 2/9/02 Cleanup
|
| 44 |
* Nilesh Rajbharti 5/22/02 Rev 2.0 (See version.log for detail)
|
| 45 |
********************************************************************/
|
| 46 |
|
| 47 |
#define TICK_INCLUDE
|
| 48 |
|
| 49 |
#include "stacktsk.h"
|
| 50 |
#include "tick.h"
|
| 51 |
|
| 52 |
#define TICK_TEMP_VALUE_1 \
|
| 53 |
((CLOCK_FREQ / 4) / (TICKS_PER_SECOND * TICK_PRESCALE_VALUE))
|
| 54 |
|
| 55 |
#if TICK_TEMP_VALUE_1 > 60000
|
| 56 |
#error TICK_PER_SECOND value cannot be programmed with current CLOCK_FREQ
|
| 57 |
#error Either lower TICK_PER_SECOND or manually configure the Timer
|
| 58 |
#endif
|
| 59 |
|
| 60 |
#define TICK_TEMP_VALUE (65535 - TICK_TEMP_VALUE_1)
|
| 61 |
|
| 62 |
#define TICK_COUNTER_HIGH ((TICK_TEMP_VALUE >> 8) & 0xff)
|
| 63 |
#define TICK_COUNTER_LOW (TICK_TEMP_VALUE & 0xff)
|
| 64 |
|
| 65 |
#if (TICK_PRESCALE_VALUE == 2)
|
| 66 |
#define TIMER_PRESCALE (0)
|
| 67 |
#elif ( TICK_PRESCALE_VALUE == 4 )
|
| 68 |
#define TIMER_PRESCALE (1)
|
| 69 |
#elif ( TICK_PRESCALE_VALUE == 8 )
|
| 70 |
#define TIMER_PRESCALE (2)
|
| 71 |
#elif ( TICK_PRESCALE_VALUE == 16 )
|
| 72 |
#define TIMER_PRESCALE (3)
|
| 73 |
#elif ( TICK_PRESCALE_VALUE == 32 )
|
| 74 |
#define TIMER_PRESCALE (4)
|
| 75 |
#elif ( TICK_PRESCALE_VALUE == 64 )
|
| 76 |
#define TIMER_PRESCALE (5)
|
| 77 |
#elif ( TICK_PRESCALE_VALUE == 128 )
|
| 78 |
#define TIMER_PRESCALE (6)
|
| 79 |
#elif ( TICK_PRESCALE_VALUE == 256 )
|
| 80 |
#define TIMER_PRESCALE (7)
|
| 81 |
#else
|
| 82 |
#error Invalid TICK_PRESCALE_VALUE specified.
|
| 83 |
#endif
|
| 84 |
|
| 85 |
|
| 86 |
|
| 87 |
|
| 88 |
TICK TickCount = 0;
|
| 89 |
|
| 90 |
|
| 91 |
/*********************************************************************
|
| 92 |
* Function: void TickInit(void)
|
| 93 |
*
|
| 94 |
* PreCondition: None
|
| 95 |
*
|
| 96 |
* Input: None
|
| 97 |
*
|
| 98 |
* Output: Tick manager is initialized.
|
| 99 |
*
|
| 100 |
* Side Effects: None
|
| 101 |
*
|
| 102 |
* Overview: Initializes Timer0 as a tick counter.
|
| 103 |
*
|
| 104 |
* Note: None
|
| 105 |
********************************************************************/
|
| 106 |
void TickInit(void)
|
| 107 |
{
|
| 108 |
// Start the timer.
|
| 109 |
TMR0L = TICK_COUNTER_LOW;
|
| 110 |
TMR0H = TICK_COUNTER_HIGH;
|
| 111 |
|
| 112 |
// 16-BIT, internal timer, PSA set to 1:256
|
| 113 |
T0CON = 0b00000000 | TIMER_PRESCALE;
|
| 114 |
|
| 115 |
|
| 116 |
// Start the timer.
|
| 117 |
T0CON_TMR0ON = 1;
|
| 118 |
|
| 119 |
INTCON_TMR0IF = 1;
|
| 120 |
INTCON_TMR0IE = 1;
|
| 121 |
|
| 122 |
}
|
| 123 |
|
| 124 |
|
| 125 |
/*********************************************************************
|
| 126 |
* Function: TICK TickGet(void)
|
| 127 |
*
|
| 128 |
* PreCondition: None
|
| 129 |
*
|
| 130 |
* Input: None
|
| 131 |
*
|
| 132 |
* Output: Current second value is given
|
| 133 |
*
|
| 134 |
* Side Effects: None
|
| 135 |
*
|
| 136 |
* Overview: None
|
| 137 |
*
|
| 138 |
* Note: None
|
| 139 |
********************************************************************/
|
| 140 |
TICK TickGet(void)
|
| 141 |
{
|
| 142 |
return TickCount;
|
| 143 |
}
|
| 144 |
|
| 145 |
|
| 146 |
/*********************************************************************
|
| 147 |
* Function: void TickUpdate(void)
|
| 148 |
*
|
| 149 |
* PreCondition: None
|
| 150 |
*
|
| 151 |
* Input: None
|
| 152 |
*
|
| 153 |
* Output: None
|
| 154 |
*
|
| 155 |
* Side Effects: None
|
| 156 |
*
|
| 157 |
* Overview: Internal Tick and Seconds count are updated.
|
| 158 |
*
|
| 159 |
* Note: None
|
| 160 |
********************************************************************/
|
| 161 |
void TickUpdate(void)
|
| 162 |
{
|
| 163 |
if ( INTCON_TMR0IF )
|
| 164 |
{
|
| 165 |
TMR0H = TICK_COUNTER_HIGH;
|
| 166 |
TMR0L = TICK_COUNTER_LOW;
|
| 167 |
|
| 168 |
TickCount++;
|
| 169 |
|
| 170 |
// Remove this if not needed.
|
| 171 |
// LATA4 ^= 1;
|
| 172 |
|
| 173 |
INTCON_TMR0IF = 0;
|
| 174 |
}
|
| 175 |
}
|
| 176 |
|
| 177 |
|
| 178 |
|
| 179 |
|
| 180 |
|
| 181 |
|
| 182 |
|
| 183 |
|
| 184 |
|
Parent Directory
| 
Revision Log