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// ----------------------------------------------------------------------------

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//         ATMEL Microcontroller Software Support  -  ROUSSET  -

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// ----------------------------------------------------------------------------

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// DISCLAIMER:  THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR

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// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE

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// DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,

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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,

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// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

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// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

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// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,

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// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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// ----------------------------------------------------------------------------

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// File Name           : interrupt_timer.c

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// Object              : Timer interrupt management

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//                     : Use AT91B_LED7 & AT91B_LED8 for status interrupt

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// Creation            : JPP   08-Sep-2005

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// ----------------------------------------------------------------------------

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// Include Standard LIB  files

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#include "config.h"

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//* Global variable

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int timer0_interrupt = 0;

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#define TIMER0_INTERRUPT_LEVEL		1

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/*-----------------*/

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/* Clock Selection */

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/*-----------------*/

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#define TC_CLKS                  0x7

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#define TC_CLKS_MCK2             0x0

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#define TC_CLKS_MCK8             0x1

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#define TC_CLKS_MCK32            0x2

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#define TC_CLKS_MCK128           0x3

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#define TC_CLKS_MCK1024          0x4

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//*------------------------- Internal Function --------------------------------

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//*----------------------------------------------------------------------------

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//* Function Name       : AT91F_TC_Open

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//* Object              : Initialize Timer Counter Channel and enable is clock

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//* Input Parameters    : <tc_pt> = TC Channel Descriptor Pointer

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//*                       <mode> = Timer Counter Mode

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//*                     : <TimerId> = Timer peripheral ID definitions

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//* Output Parameters   : None

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//*----------------------------------------------------------------------------

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void AT91F_TC_Open ( AT91PS_TC TC_pt, unsigned int Mode, unsigned int TimerId)

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{

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  unsigned int dummy;

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  //* First, enable the clock of the TIMER

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  AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1<< TimerId ) ;

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  //* Disable the clock and the interrupts

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  TC_pt->TC_CCR = AT91C_TC_CLKDIS ;

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  TC_pt->TC_IDR = 0xFFFFFFFF ;

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  //* Clear status bit

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  dummy = TC_pt->TC_SR;

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  //* Suppress warning variable "dummy" was set but never used

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  dummy = dummy;

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  //* Set the Mode of the Timer Counter

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  TC_pt->TC_CMR = Mode ;

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  //* Enable the clock

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  TC_pt->TC_CCR = AT91C_TC_CLKEN ;

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}

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//*------------------------- Interrupt Function -------------------------------

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//*----------------------------------------------------------------------------

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//* Function Name       : timer0_c_irq_handler

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//* Object              : C handler interrupt function calAT91B_LED by the interrupts

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//*                       assembling routine

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//* Output Parameters   : increment count_timer0_interrupt

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//*----------------------------------------------------------------------------

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void timer0_c_irq_handler(void)

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{

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  AT91PS_TC TC_pt = AT91C_BASE_TC0;

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  unsigned int dummy;

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  //* AcknowAT91B_LEDge interrupt status

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  dummy = TC_pt->TC_SR;

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  //* Suppress warning variable "dummy" was set but never used

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  dummy = dummy;

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  timer0_interrupt = TRUE;

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}

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//*-------------------------- External Function -------------------------------

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//*----------------------------------------------------------------------------

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//* Function Name       : timer_init

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//* Object              : Init timer counter

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//* Input Parameters    : none

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//* Output Parameters   : TRUE

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//*----------------------------------------------------------------------------

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void timer_init (unsigned int time)

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{

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  //* Open timer0

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  AT91F_TC_Open(AT91C_BASE_TC0,TC_CLKS_MCK8 | AT91C_TC_WAVESEL_UP_AUTO,AT91C_ID_TC0);

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  //* Open Timer 0 interrupt

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  AT91F_AIC_ConfigureIt ( AT91C_BASE_AIC, AT91C_ID_TC0, TIMER0_INTERRUPT_LEVEL,AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, timer0_c_irq_handler);

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  AT91C_BASE_TC0->TC_IER = AT91C_TC_CPCS;  //  IRQ enable CPC

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  AT91F_AIC_EnableIt (AT91C_BASE_AIC, AT91C_ID_TC0);

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  AT91C_BASE_TC0->TC_RC = (unsigned int)(AT91C_MASTER_CLOCK / 8 * time / 1000);

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  //* Start timer0

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  AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG ;

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}