blob: 47be69ee7f2c345aa433928e01a31d970eacf9e0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
/* *****************************************************************************
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Created: 12/18/09 02:37:24
* Copyright (c) 2009 Perry L. Hung. All rights reserved.
*
* ****************************************************************************/
/**
* @file systick.c
*
* @brief System timer interrupt handler and initialization routines
*/
#include "libmaple.h"
#include "systick.h"
#define MILLIS_INC 1
volatile uint32_t systick_timer_millis = 0;
void systick_init(void) {
/* Set the reload counter to tick every 1ms */
REG_SET_MASK(SYSTICK_RELOAD, MAPLE_RELOAD_VAL);
// SYSTICK_RELOAD = MAPLE_RELOAD_VAL;
/* Clock the system timer with the core clock
* and turn it on, interrrupt every 1ms to keep track of millis()*/
REG_SET(SYSTICK_CSR, SYSTICK_SRC_HCLK |
SYSTICK_ENABLE |
SYSTICK_TICKINT);
// SYSTICK_CSR = SYSTICK_SRC_HCLK |
// SYSTICK_ENABLE |
// SYSTICK_TICKINT;
}
void SysTickHandler(void) {
systick_timer_millis++;
}
|
