/* ---------------------------------------------------------------------------- | |
* ATMEL Microcontroller Software Support | |
* ---------------------------------------------------------------------------- | |
* Copyright (c) 2008, Atmel Corporation | |
* | |
* All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions are met: | |
* | |
* - Redistributions of source code must retain the above copyright notice, | |
* this list of conditions and the disclaimer below. | |
* | |
* Atmel's name may not be used to endorse or promote products derived from | |
* this software without specific prior written permission. | |
* | |
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR | |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE | |
* DISCLAIMED. IN NO EVENT SHALL ATMEL 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. | |
* ---------------------------------------------------------------------------- | |
*/ | |
//------------------------------------------------------------------------------ | |
// Headers | |
//------------------------------------------------------------------------------ | |
#include "pit.h" | |
#include <board.h> | |
//------------------------------------------------------------------------------ | |
// Exported functions | |
//------------------------------------------------------------------------------ | |
//------------------------------------------------------------------------------ | |
/// Initialize the System timer for a period in µsecond with a system clock | |
/// freq in MHz | |
/// \param period Period in µsecond. | |
/// \param pit_frequency System clock frequency in MHz. | |
//------------------------------------------------------------------------------ | |
void PIT_Init(unsigned int period, | |
unsigned int pit_frequency) | |
{ | |
AT91C_BASE_PITC->PITC_PIMR = period? (period * pit_frequency + 8) >> 4 : 0; // +8 to avoid %10 and /10 | |
AT91C_BASE_PITC->PITC_PIMR |= AT91C_PITC_PITEN; | |
} | |
//------------------------------------------------------------------------------ | |
/// Set the PIT Periodic Interval Value | |
//------------------------------------------------------------------------------ | |
void PIT_SetPIV(unsigned int piv) | |
{ | |
AT91C_BASE_PITC->PITC_PIMR = piv | (AT91C_BASE_PITC->PITC_PIMR & (AT91C_PITC_PITEN | AT91C_PITC_PITIEN)); | |
} | |
//------------------------------------------------------------------------------ | |
/// Enable the PIT | |
//------------------------------------------------------------------------------ | |
void PIT_Enable(void) | |
{ | |
AT91C_BASE_PITC->PITC_PIMR |= AT91C_PITC_PITEN; | |
} | |
//---------------------------------------------------------------------------- | |
/// Enable PIT periodic interrupt | |
//---------------------------------------------------------------------------- | |
void PIT_EnableIT(void) | |
{ | |
AT91C_BASE_PITC->PITC_PIMR |= AT91C_PITC_PITIEN; | |
} | |
//------------------------------------------------------------------------------ | |
/// Disable PIT periodic interrupt | |
//------------------------------------------------------------------------------ | |
void PIT_DisableIT(void) | |
{ | |
AT91C_BASE_PITC->PITC_PIMR &= ~AT91C_PITC_PITIEN; | |
} | |
//------------------------------------------------------------------------------ | |
/// Read PIT mode register | |
//------------------------------------------------------------------------------ | |
unsigned int PIT_GetMode(void) | |
{ | |
return(AT91C_BASE_PITC->PITC_PIMR); | |
} | |
//------------------------------------------------------------------------------ | |
/// Read PIT status register | |
//------------------------------------------------------------------------------ | |
unsigned int PIT_GetStatus(void) | |
{ | |
return(AT91C_BASE_PITC->PITC_PISR); | |
} | |
//------------------------------------------------------------------------------ | |
/// Read PIT CPIV and PICNT without ressetting the counters | |
//------------------------------------------------------------------------------ | |
unsigned int PIT_GetPIIR(void) | |
{ | |
return(AT91C_BASE_PITC->PITC_PIIR); | |
} | |
//------------------------------------------------------------------------------ | |
/// Read System timer CPIV and PICNT without ressetting the counters | |
//------------------------------------------------------------------------------ | |
unsigned int PIT_GetPIVR(void) | |
{ | |
return(AT91C_BASE_PITC->PITC_PIVR); | |
} |