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