PIC/TCP-IP%20stack/Tick.c

/*********************************************************************
 *
 *                  Tick Manager for PIC18
 *
 *********************************************************************
 * FileName:        Tick.c
 * Dependencies:    stackTSK.h
 *                  Tick.h
 * Processor:       PIC18
 * Complier:        MCC18 v1.00.50 or higher
 *                  HITECH PICC-18 V8.10PL1 or higher
 * Company:         Microchip Technology, Inc.
 *
 * Software License Agreement
 *
 * The software supplied herewith by Microchip Technology Incorporated
 * (the “Company”) for its PICmicro® Microcontroller is intended and
 * supplied to you, the Company’s customer, for use solely and
 * exclusively on Microchip PICmicro Microcontroller products. The
 * software is owned by the Company and/or its supplier, and is
 * protected under applicable copyright laws. All rights are reserved.
 * Any use in violation of the foregoing restrictions may subject the
 * user to criminal sanctions under applicable laws, as well as to
 * civil liability for the breach of the terms and conditions of this
 * license.
 *
 * THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES,
 * WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED
 * TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT,
 * IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
 * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
 *
 * HiTech PICC18 Compiler Options excluding device selection:
 *                  -FAKELOCAL -G -O -Zg -E -C
 *
 *
 *
 *
 * Author               Date        Comment
 *~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Nilesh Rajbharti     6/28/01     Original        (Rev 1.0)
 * Nilesh Rajbharti     2/9/02      Cleanup
 * Nilesh Rajbharti     5/22/02     Rev 2.0 (See version.log for detail)
********************************************************************/

#define TICK_INCLUDE

#include "stacktsk.h"
#include "tick.h"

#define TICK_TEMP_VALUE_1       \
        ((CLOCK_FREQ / 4) / (TICKS_PER_SECOND * TICK_PRESCALE_VALUE))

#if TICK_TEMP_VALUE_1 > 60000
#error TICK_PER_SECOND value cannot be programmed with current CLOCK_FREQ
#error Either lower TICK_PER_SECOND or manually configure the Timer
#endif

#define TICK_TEMP_VALUE         (65535 - TICK_TEMP_VALUE_1)

#define TICK_COUNTER_HIGH       ((TICK_TEMP_VALUE >> 8) & 0xff)
#define TICK_COUNTER_LOW        (TICK_TEMP_VALUE & 0xff)

#if (TICK_PRESCALE_VALUE == 2)
    #define TIMER_PRESCALE  (0)
#elif ( TICK_PRESCALE_VALUE == 4 )
    #define TIMER_PRESCALE  (1)
#elif ( TICK_PRESCALE_VALUE == 8 )
    #define TIMER_PRESCALE  (2)
#elif ( TICK_PRESCALE_VALUE == 16 )
    #define TIMER_PRESCALE  (3)
#elif ( TICK_PRESCALE_VALUE == 32 )
    #define TIMER_PRESCALE  (4)
#elif ( TICK_PRESCALE_VALUE == 64 )
    #define TIMER_PRESCALE  (5)
#elif ( TICK_PRESCALE_VALUE == 128 )
    #define TIMER_PRESCALE  (6)
#elif ( TICK_PRESCALE_VALUE == 256 )
    #define TIMER_PRESCALE  (7)
#else
    #error Invalid TICK_PRESCALE_VALUE specified.
#endif


TICK TickCount = 0;


/*********************************************************************
 * Function:        void TickInit(void)
 *
 * PreCondition:    None
 *
 * Input:           None
 *
 * Output:          Tick manager is initialized.
 *
 * Side Effects:    None
 *
 * Overview:        Initializes Timer0 as a tick counter.
 *
 * Note:            None
 ********************************************************************/
void TickInit(void)
{
    // Start the timer.
    TMR0L = TICK_COUNTER_LOW;
    TMR0H = TICK_COUNTER_HIGH;

    // 16-BIT, internal timer, PSA set to 1:256
    T0CON = 0b00000000 | TIMER_PRESCALE;


    // Start the timer.
    T0CON_TMR0ON = 1;

    INTCON_TMR0IF = 1;
    INTCON_TMR0IE = 1;

}


/*********************************************************************
 * Function:        TICK TickGet(void)
 *
 * PreCondition:    None
 *
 * Input:           None
 *
 * Output:          Current second value is given
 *
 * Side Effects:    None
 *
 * Overview:        None
 *
 * Note:            None
 ********************************************************************/
TICK TickGet(void)
{
    return TickCount;
}


/*********************************************************************
 * Function:        void TickUpdate(void)
 *
 * PreCondition:    None
 *
 * Input:           None
 *
 * Output:          None
 *
 * Side Effects:    None
 *
 * Overview:        Internal Tick and Seconds count are updated.
 *
 * Note:            None
 ********************************************************************/
void TickUpdate(void)
{
    if ( INTCON_TMR0IF )
    {
        TMR0H = TICK_COUNTER_HIGH;
        TMR0L = TICK_COUNTER_LOW;

        TickCount++;

        // Remove this if not needed.
        // LATA4 ^= 1;

        INTCON_TMR0IF = 0;
    }
}


1	hedin	54	/*********************************************************************
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
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