interrupt_timer.c

ATMEL AT91SAM9260的中段控制程序！

/*-----------------------------------------------------------------------------
 *           ATMEL Microcontroller Software Support  -  ROUSSET  -
 *-----------------------------------------------------------------------------
 * 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.
 *----------------------------------------------------------------------------
 * File Name           : interrupt_timer.c
 * Object              : Timer interrupt management
 *
 * 1.0 06/Sep/06 JPP   : Creation
 *----------------------------------------------------------------------------
*/
// Include Standard LIB  files
#include "project.h"
#include "led.h"

//* Global variable
static int count_timer0_interrupt;

#define TIMER0_INTERRUPT_LEVEL		1

/*-----------------*/
/* Clock Selection */
/*-----------------*/
#define TC_CLKS_MCK2             0x0
#define TC_CLKS_MCK8             0x1
#define TC_CLKS_MCK32            0x2
#define TC_CLKS_MCK128           0x3

//*------------------------- Internal Function --------------------------------
//*----------------------------------------------------------------------------
//* Function Name       : AT91F_TC_Open
//* Object              : Initialize Timer Counter Channel and enable is clock
//* Input Parameters    : <tc_pt> = TC Channel Descriptor Pointer
//*                       <mode> = Timer Counter Mode
//*                     : <TimerId> = Timer peripheral ID definitions
//* Output Parameters   : None
//*----------------------------------------------------------------------------
void AT91F_TC_Open ( AT91PS_TC TC_pt, unsigned int Mode, unsigned int TimerId)
{

    //* First, enable the clock of the TIMER
    	AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1<< TimerId ) ;

    //* Disable the clock and the interrupts
	TC_pt->TC_CCR = AT91C_TC_CLKDIS ;
	TC_pt->TC_IDR = 0xFFFFFFFF ;

    //* Clear status bit
        TC_pt->TC_SR;
    //* Set the Mode of the Timer Counter
	TC_pt->TC_CMR = Mode ;

    //* Enable the clock
	TC_pt->TC_CCR = AT91C_TC_CLKEN ;
}

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

//*----------------------------------------------------------------------------
//* Function Name       : timer0_c_irq_handler
//* Object              : C handler interrupt function called by the interrupts
//*                       assembling routine
//* Output Parameters   : increment count_timer0_interrupt
//*----------------------------------------------------------------------------
void timer0_c_irq_handler(void)
{
    AT91PS_TC TC_pt = AT91C_BASE_TC0;

    //* Acknowledge interrupt status
        TC_pt->TC_SR;

        count_timer0_interrupt++;

        AT91F_PIO_InvertLed(AT91B_LED1);
}
//*-------------------------- External Function -------------------------------

//*----------------------------------------------------------------------------
//* Function Name       : timer_init
//* Object              : Init timer counter
//* Input Parameters    : none
//* Output Parameters   : TRUE
//*----------------------------------------------------------------------------
void timer_init ( void )
//* Begin
{
    //init the timer interrupt counter
    count_timer0_interrupt=0;

    //* Open timer0
	AT91F_TC_Open(AT91C_BASE_TC0,TC_CLKS_MCK128,AT91C_ID_TC0);

    //* Open Timer 0 interrupt
	AT91F_AIC_ConfigureIt ( AT91C_BASE_AIC, AT91C_ID_TC0,
                               TIMER0_INTERRUPT_LEVEL,
                               AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE,
                               timer0_c_irq_handler);

        AT91C_BASE_TC0->TC_IER = AT91C_TC_CPCS;  //  IRQ enable CPC
	AT91F_AIC_EnableIt (AT91C_BASE_AIC, AT91C_ID_TC0);

    //* Start timer0
        AT91C_BASE_TC0->TC_CCR = AT91C_TC_SWTRG ;
}