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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [drivers/] [Atmel/] [at91lib/] [peripherals/] [pit/] [pit.c] - Rev 867
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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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