OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [drivers/] [Atmel/] [at91lib/] [peripherals/] [pit/] [pit.c] - Blame information for rev 608

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 608 jeremybenn
/* ----------------------------------------------------------------------------
2
 *         ATMEL Microcontroller Software Support
3
 * ----------------------------------------------------------------------------
4
 * Copyright (c) 2008, Atmel Corporation
5
 *
6
 * All rights reserved.
7
 *
8
 * Redistribution and use in source and binary forms, with or without
9
 * modification, are permitted provided that the following conditions are met:
10
 *
11
 * - Redistributions of source code must retain the above copyright notice,
12
 * this list of conditions and the disclaimer below.
13
 *
14
 * Atmel's name may not be used to endorse or promote products derived from
15
 * this software without specific prior written permission.
16
 *
17
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
20
 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
23
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
24
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
25
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
26
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 * ----------------------------------------------------------------------------
28
 */
29
 
30
//------------------------------------------------------------------------------
31
//         Headers
32
//------------------------------------------------------------------------------
33
 
34
#include "pit.h"
35
#include <board.h>
36
 
37
//------------------------------------------------------------------------------
38
//         Exported functions
39
//------------------------------------------------------------------------------
40
//------------------------------------------------------------------------------
41
/// Initialize the System timer for a period in µsecond with a system clock
42
/// freq in MHz
43
/// \param period  Period in µsecond.
44
/// \param pit_frequency  System clock frequency in MHz.
45
//------------------------------------------------------------------------------
46
void PIT_Init(unsigned int period,
47
                     unsigned int pit_frequency)
48
{
49
    AT91C_BASE_PITC->PITC_PIMR = period? (period * pit_frequency + 8) >> 4 : 0; // +8 to avoid %10 and /10
50
    AT91C_BASE_PITC->PITC_PIMR |= AT91C_PITC_PITEN;
51
}
52
 
53
//------------------------------------------------------------------------------
54
/// Set the PIT Periodic Interval Value
55
//------------------------------------------------------------------------------
56
void PIT_SetPIV(unsigned int piv)
57
{
58
    AT91C_BASE_PITC->PITC_PIMR = piv | (AT91C_BASE_PITC->PITC_PIMR & (AT91C_PITC_PITEN | AT91C_PITC_PITIEN));
59
}
60
 
61
//------------------------------------------------------------------------------
62
/// Enable the PIT
63
//------------------------------------------------------------------------------
64
void PIT_Enable(void)
65
{
66
    AT91C_BASE_PITC->PITC_PIMR |= AT91C_PITC_PITEN;
67
}
68
 
69
//----------------------------------------------------------------------------
70
/// Enable PIT periodic interrupt
71
//----------------------------------------------------------------------------
72
void PIT_EnableIT(void)
73
{
74
    AT91C_BASE_PITC->PITC_PIMR |= AT91C_PITC_PITIEN;
75
}
76
 
77
//------------------------------------------------------------------------------
78
/// Disable PIT periodic interrupt
79
//------------------------------------------------------------------------------
80
void PIT_DisableIT(void)
81
{
82
    AT91C_BASE_PITC->PITC_PIMR &= ~AT91C_PITC_PITIEN;
83
}
84
 
85
//------------------------------------------------------------------------------
86
/// Read PIT mode register
87
//------------------------------------------------------------------------------
88
unsigned int PIT_GetMode(void)
89
{
90
    return(AT91C_BASE_PITC->PITC_PIMR);
91
}
92
 
93
//------------------------------------------------------------------------------
94
/// Read PIT status register
95
//------------------------------------------------------------------------------
96
unsigned int PIT_GetStatus(void)
97
{
98
    return(AT91C_BASE_PITC->PITC_PISR);
99
}
100
 
101
//------------------------------------------------------------------------------
102
/// Read PIT CPIV and PICNT without ressetting the counters
103
//------------------------------------------------------------------------------
104
unsigned int PIT_GetPIIR(void)
105
{
106
    return(AT91C_BASE_PITC->PITC_PIIR);
107
}
108
 
109
//------------------------------------------------------------------------------
110
/// Read System timer CPIV and PICNT without ressetting the counters
111
//------------------------------------------------------------------------------
112
unsigned int PIT_GetPIVR(void)
113
{
114
    return(AT91C_BASE_PITC->PITC_PIVR);
115
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.