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/*********************************************************************
 *
 *                  Ticker service
 *
 *********************************************************************
 * FileName:        Tick.c
 *
 * Author               Date    Comment
 *~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Johan Böhlin     21-10-06    Original        (Rev 1.0)
 ********************************************************************/
 
#define TICK_INCLUDE
 
#include <Tick.h>
#include <Compiler.h>
 
#define TICK_TEMP_VALUE_1 ((INSTR_FREQ) / (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; // 10ms/unit
 
 
 
/*
*   Function: TickInit
*
*   Input:  none
*   Output: Tick manager is initialized.
*   Pre-conditions: TickInit
*   Affects: none
*   Depends: none
*/
#define PERIOD (INSTR_FREQ/256/1000)*TICK_PERIOD_MS
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.
    T0CONbits.TMR0ON = 1;
 
    INTCONbits.TMR0IF = 1;
    INTCONbits.TMR0IE = 1;
}
 
/*
*   Function: TickGet
*
*   Input:  none
*   Output: Current tick value is given, 1 tick represents approximately 10ms
*   Pre-conditions: TickInit
*   Affects: none
*   Depends: none
*/
TICK tickGet(void)
{
    return TickCount;
}
 
 
/*
*   Function: tickUpdate
*
*   Input:  none
*   Output: none
*   Pre-conditions: TickInit
*   Affects: none
*   Depends: none
*/
void tickUpdate(void)
{
    if(INTCONbits.TMR0IF)
    {
        TMR0H = TICK_COUNTER_HIGH;
        TMR0L = TICK_COUNTER_LOW;
 
        TickCount++;
 
        INTCONbits.TMR0IF = 0;
    }
}
 

Rev 56	Rev 73
1	/*********************************************************************	1	/*********************************************************************
2	*	2	*
3	* Ticker service	3	* Ticker service
4	*	4	*
5	*********************************************************************	5	*********************************************************************
6	* FileName: Tick.c	6	* FileName: Tick.c
7	*	7	*
8	* Author Date Comment	8	* Author Date Comment
9	*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~	9	*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10	* Johan Böhlin 21-10-06 Original (Rev 1.0)	10	* Johan Böhlin 21-10-06 Original (Rev 1.0)
11	********************************************************************/	11	********************************************************************/
12		12
13	#define TICK_INCLUDE	13	#define TICK_INCLUDE
14		14
15	#include <Tick.h>	15	#include <Tick.h>
16	#include <Compiler.h>	16	#include <Compiler.h>
17		17
18	#define TICK_TEMP_VALUE_1 ((INSTR_FREQ) / (TICKS_PER_SECOND * TICK_PRESCALE_VALUE))	18	#define TICK_TEMP_VALUE_1 ((INSTR_FREQ) / (TICKS_PER_SECOND * TICK_PRESCALE_VALUE))
19		19
20	#if TICK_TEMP_VALUE_1 > 60000	20	#if TICK_TEMP_VALUE_1 > 60000
21	#error TICK_PER_SECOND value cannot be programmed with current CLOCK_FREQ	21	#error TICK_PER_SECOND value cannot be programmed with current CLOCK_FREQ
22	#error Either lower TICK_PER_SECOND or manually configure the Timer	22	#error Either lower TICK_PER_SECOND or manually configure the Timer
23	#endif	23	#endif
24		24
25	#define TICK_TEMP_VALUE (65535 - TICK_TEMP_VALUE_1)	25	#define TICK_TEMP_VALUE (65535 - TICK_TEMP_VALUE_1)
26		26
27	#define TICK_COUNTER_HIGH ((TICK_TEMP_VALUE >> 8) & 0xff)	27	#define TICK_COUNTER_HIGH ((TICK_TEMP_VALUE >> 8) & 0xff)
28	#define TICK_COUNTER_LOW (TICK_TEMP_VALUE & 0xff)	28	#define TICK_COUNTER_LOW (TICK_TEMP_VALUE & 0xff)
29		29
30	#if (TICK_PRESCALE_VALUE == 2)	30	#if (TICK_PRESCALE_VALUE == 2)
31	#define TIMER_PRESCALE (0)	31	#define TIMER_PRESCALE (0)
32	#elif ( TICK_PRESCALE_VALUE == 4 )	32	#elif ( TICK_PRESCALE_VALUE == 4 )
33	#define TIMER_PRESCALE (1)	33	#define TIMER_PRESCALE (1)
34	#elif ( TICK_PRESCALE_VALUE == 8 )	34	#elif ( TICK_PRESCALE_VALUE == 8 )
35	#define TIMER_PRESCALE (2)	35	#define TIMER_PRESCALE (2)
36	#elif ( TICK_PRESCALE_VALUE == 16 )	36	#elif ( TICK_PRESCALE_VALUE == 16 )
37	#define TIMER_PRESCALE (3)	37	#define TIMER_PRESCALE (3)
38	#elif ( TICK_PRESCALE_VALUE == 32 )	38	#elif ( TICK_PRESCALE_VALUE == 32 )
39	#define TIMER_PRESCALE (4)	39	#define TIMER_PRESCALE (4)
40	#elif ( TICK_PRESCALE_VALUE == 64 )	40	#elif ( TICK_PRESCALE_VALUE == 64 )
41	#define TIMER_PRESCALE (5)	41	#define TIMER_PRESCALE (5)
42	#elif ( TICK_PRESCALE_VALUE == 128 )	42	#elif ( TICK_PRESCALE_VALUE == 128 )
43	#define TIMER_PRESCALE (6)	43	#define TIMER_PRESCALE (6)
44	#elif ( TICK_PRESCALE_VALUE == 256 )	44	#elif ( TICK_PRESCALE_VALUE == 256 )
45	#define TIMER_PRESCALE (7)	45	#define TIMER_PRESCALE (7)
46	#else	46	#else
47	#error Invalid TICK_PRESCALE_VALUE specified.	47	#error Invalid TICK_PRESCALE_VALUE specified.
48	#endif	48	#endif
49		49
50		50
51	TICK TickCount = 0; // 10ms/unit	51	TICK TickCount = 0; // 10ms/unit
52		52
53		53
54		54
55	/*	55	/*
56	* Function: TickInit	56	* Function: TickInit
57	*	57	*
58	* Input: none	58	* Input: none
59	* Output: Tick manager is initialized.	59	* Output: Tick manager is initialized.
60	* Pre-conditions: TickInit	60	* Pre-conditions: TickInit
61	* Affects: none	61	* Affects: none
62	* Depends: none	62	* Depends: none
63	*/	63	*/
64	#define PERIOD (INSTR_FREQ/256/1000)*TICK_PERIOD_MS	64	#define PERIOD (INSTR_FREQ/256/1000)*TICK_PERIOD_MS
65	void tickInit(void)	65	void tickInit(void)
66	{	66	{
67	// Start the timer.	67	// Start the timer.
68	TMR0L = TICK_COUNTER_LOW;	68	TMR0L = TICK_COUNTER_LOW;
69	TMR0H = TICK_COUNTER_HIGH;	69	TMR0H = TICK_COUNTER_HIGH;
70		70
71	// 16-BIT, internal timer, PSA set to 1:256	71	// 16-BIT, internal timer, PSA set to 1:256
72	T0CON = 0b00000000 \| TIMER_PRESCALE;	72	T0CON = 0b00000000 \| TIMER_PRESCALE;
73		73
74	// Start the timer.	74	// Start the timer.
75	T0CONbits.TMR0ON = 1;	75	T0CONbits.TMR0ON = 1;
76		76
77	INTCONbits.TMR0IF = 1;	77	INTCONbits.TMR0IF = 1;
78	INTCONbits.TMR0IE = 1;	78	INTCONbits.TMR0IE = 1;
79	}	79	}
80		80
81	/*	81	/*
82	* Function: TickGet	82	* Function: TickGet
83	*	83	*
84	* Input: none	84	* Input: none
85	* Output: Current tick value is given, 1 tick represents approximately 10ms	85	* Output: Current tick value is given, 1 tick represents approximately 10ms
86	* Pre-conditions: TickInit	86	* Pre-conditions: TickInit
87	* Affects: none	87	* Affects: none
88	* Depends: none	88	* Depends: none
89	*/	89	*/
90	TICK tickGet(void)	90	TICK tickGet(void)
91	{	91	{
92	return TickCount;	92	return TickCount;
93	}	93	}
94		94
95		95
96	/*	96	/*
97	* Function: tickUpdate	97	* Function: tickUpdate
98	*	98	*
99	* Input: none	99	* Input: none
100	* Output: none	100	* Output: none
101	* Pre-conditions: TickInit	101	* Pre-conditions: TickInit
102	* Affects: none	102	* Affects: none
103	* Depends: none	103	* Depends: none
104	*/	104	*/
105	void tickUpdate(void)	105	void tickUpdate(void)
106	{	106	{
107	if(INTCONbits.TMR0IF)	107	if(INTCONbits.TMR0IF)
108	{	108	{
109	TMR0H = TICK_COUNTER_HIGH;	109	TMR0H = TICK_COUNTER_HIGH;
110	TMR0L = TICK_COUNTER_LOW;	110	TMR0L = TICK_COUNTER_LOW;
111		111
112	TickCount++;	112	TickCount++;
113		113
114	INTCONbits.TMR0IF = 0;	114	INTCONbits.TMR0IF = 0;
115	}	115	}
116	}	116	}
117		117

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(root)/trunk/EmbeddedSoftware/PIC/canToSerial/Source/Tick.c @ 73 – Rev 56 → 73