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Atmel provided hardware specifics.

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Richard Barry 2008-11-28 15:39:53 +00:00
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115
Demo/Common/drivers/Atmel/at91lib/peripherals/pit/pit.c Normal file
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/* ----------------------------------------------------------------------------
* 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);
}

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Demo/Common/drivers/Atmel/at91lib/peripherals/pit/pit.h Normal file
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/* ----------------------------------------------------------------------------
* 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.
* ----------------------------------------------------------------------------
*/
//------------------------------------------------------------------------------
/// \unit
/// !Purpose
///
/// Configuration and handling of PIT.
///
/// !Usage
///
/// -# Initialize System timer for a period in µsecond with
/// PIT_Init
/// -# Set the PIT Periodic Interval Value with PIT_SetPIV
/// -# Enable the PIT with PIT_Enable
/// -# Enable & disable PIT interrupts using PIT_EnableInt and
/// PIT_DisableInt
/// -# Read PIT mode register
/// PIT_GetMode
/// -# Read PIT status register
/// PIT_GetStatus
/// -# Read PIT CPIV and PICNT without ressetting the counters
/// PIT_GetPIIR
/// -# Read System timer CPIV and PICNT without ressetting the counters
/// PIT_GetPIVR
//------------------------------------------------------------------------------
#ifndef PIT_H
#define PIT_H
//------------------------------------------------------------------------------
// Headers
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
// Exported functions
//------------------------------------------------------------------------------
extern void PIT_Init(unsigned int period, unsigned int pit_frequency);
extern void PIT_SetPIV(unsigned int piv);
extern void PIT_Enable(void);
extern void PIT_EnableIT(void);
extern void PIT_DisableIT(void);
extern unsigned int PIT_GetMode(void);
extern unsigned int PIT_GetStatus(void);
extern unsigned int PIT_GetPIIR(void);
extern unsigned int PIT_GetPIVR(void);
#endif //#ifndef PIT_H