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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
/****************************************************************************
* arch/arm/src/lpc214x/lpc214x_timerisr.c
*
* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <arch/board/board.h>
#include "clock_internal.h"
#include "up_internal.h"
#include "up_arch.h"
#include "lpc214x_timer.h"
#include "lpc214x_vic.h"
/****************************************************************************
* Definitions
****************************************************************************/
/* The timers count at the rate of PCLK which is determined by PLL_M and
* and APBDIV:
*/
#define LPC214X_CCLKFREQ (LPC214X_FOSC*LPC214X_PLL_M)
#define LPC214X_PCLKFREQ (LPC214X_CCLKFREQ/LPC214X_APBDIV)
#define tmr_getreg8(o) getreg8(LPC214X_TMR0_BASE+(o))
#define tmr_getreg16(o) getreg16(LPC214X_TMR0_BASE+(o))
#define tmr_getreg32(o) getreg32(LPC214X_TMR0_BASE+(o))
#define tmr_putreg8(v,o) putreg8((v), LPC214X_TMR0_BASE+(o))
#define tmr_putreg16(v,o) putreg16((v), LPC214X_TMR0_BASE+(o))
#define tmr_putreg32(v,o) putreg32((v), LPC214X_TMR0_BASE+(o))
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Global Functions
****************************************************************************/
/****************************************************************************
* Function: up_timerisr
*
* Description:
* The timer ISR will perform a variety of services for
* various portions of the systems.
*
****************************************************************************/
#ifdef CONFIG_VECTORED_INTERRUPTS
int up_timerisr(uint32 *regs)
#else
int up_timerisr(int irq, uint32 *regs)
#endif
{
/* Process timer interrupt */
sched_process_timer();
/* Clear the MR0 match interrupt */
tmr_putreg8(LPC214X_TMR_IR_MR0I, LPC214X_TMR_IR_OFFSET);
/* Reset the VIC as well */
#ifdef CONFIG_VECTORED_INTERRUPTS
vic_putreg(0, LPC214X_VIC_VECTADDR_OFFSET);
#endif
return 0;
}
/****************************************************************************
* Function: up_timerinit
*
* Description:
* This function is called during start-up to initialize
* the timer interrupt.
*
****************************************************************************/
void up_timerinit(void)
{
uint16 mcr;
/* Clear all match and capture event interrupts */
tmr_putreg8(LPC214X_TMR_IR_ALLI, LPC214X_TMR_IR_OFFSET);
/* Clear the timer counter */
tmr_putreg32(0, LPC214X_TMR_TC_OFFSET);
/* No pre-scaler */
tmr_putreg32(0, LPC214X_TMR_PR_OFFSET);
/* Set timer match registger to get a TICK_PER_SEC rate
* See arch/board.h and sched/os_internal.h
*/
tmr_putreg32(LPC214X_PCLKFREQ/TICK_PER_SEC, LPC214X_TMR_MR0_OFFSET);
/* Reset timer counter regiser and interrupt on match */
mcr = tmr_getreg16(LPC214X_TMR_MCR_OFFSET);
mcr &= ~LPC214X_TMR_MCR_MR1I;
mcr |= (LPC214X_TMR_MCR_MR0I | LPC214X_TMR_MCR_MR0R);
tmr_putreg16(mcr, LPC214X_TMR_MCR_OFFSET);
/* Enable counting */
tmr_putreg8(LPC214X_TMR_CR_ENABLE, LPC214X_TMR_TCR_OFFSET);
/* Attach the timer interrupt vector */
#ifdef CONFIG_VECTORED_INTERRUPTS
up_attach_vector(LPC214X_IRQ_SYSTIMER, LPC214X_SYSTIMER_VEC, (vic_vector_t)up_timerisr);
#else
(void)irq_attach(LPC214X_IRQ_SYSTIMER, (xcpt_t)up_timerisr);
#endif
/* And enable the timer interrupt */
up_enable_irq(LPC214X_IRQ_SYSTIMER);
}
|
