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 867

Go to most recent revision | 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.