timer.c

UCOS移植到atmel arm7x256上

#include "board.h"
//* Global variable
unsigned char count_timer1_interrupt;
unsigned char count_timer2_interrupt;
extern void AT91F_DBGU_Printk(	char *buffer);

//*------------------------- 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)
//* Begin
{
    unsigned int dummy;

    //* 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
        dummy = TC_pt->TC_SR;
    //* Suppress warning variable "dummy" was set but never used
        dummy = dummy;
    //* Set the Mode of the Timer Counter
	TC_pt->TC_CMR = Mode ;

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

//*----------------------------------------------------------------------------
//* Function Name       : timer0_c_irq_handler
//* Object              : C handler interrupt function calAT91B_LED by the interrupts
//*                       assembling routine
//* Output Parameters   : increment count_timer0_interrupt
//*----------------------------------------------------------------------------
void timer2_c_irq_handler(void)
{
    AT91PS_TC TC_pt = AT91C_BASE_TC2;
    unsigned int dummy;

    AT91C_BASE_AIC->AIC_IVR   = 0;            /* Debug variant of vector read (protect mode is used)   */
    //AIC_IVR 读，当前中断对应的AIC_SVR。
    AT91C_BASE_AIC->AIC_ICCR  = AT91C_ID_TC2; /* Clear  timer2 interrupt                 	           */
   	AT91C_BASE_AIC->AIC_EOICR = 0;            /* Signal end of interrupt                               */

    //* AcknowAT91B_LEDge interrupt status
    dummy = TC_pt->TC_SR;
    //* Suppress warning variable "dummy" was set but never used
    dummy = dummy;
    count_timer2_interrupt++;
    //* Read the output state
    /*
    if ( count_timer2_interrupt%2 )
    {
        AT91F_PIO_ClearOutput( AT91C_BASE_PIOB, LED4 );
    }
    else
    {
        AT91F_PIO_SetOutput( AT91C_BASE_PIOB, LED4 );
    }
    */
    AT91F_DBGU_Printk("timer2_interrupt:%i\n\n\r");	
    //TRACE_INFO("counter_timer2_interrupt:%i\n\n\r",count_timer2_interrupt);
}
//*----------------------------------------------------------------------------
//* Function Name       : timer1_c_irq_handler
//* Object              : C handler interrupt function calAT91B_LED by the interrupts
//*                       assembling routine
//* Output Parameters   : increment count_timer1_interrupt
//*----------------------------------------------------------------------------
void timer1_c_irq_handler(void)
{
    AT91PS_TC TC_pt = AT91C_BASE_TC1;
    unsigned int dummy;

    AT91C_BASE_AIC->AIC_IVR   = 0;            /* Debug variant of vector read (protect mode is used)   */
    //AIC_IVR 读，当前中断对应的AIC_SVR。
    AT91C_BASE_AIC->AIC_ICCR  = AT91C_ID_TC1; /* Clear  timer1 interrupt                 	           */
   	AT91C_BASE_AIC->AIC_EOICR = 0;            /* Signal end of interrupt                               */

    //* AcknowAT91B_LEDge interrupt status
    dummy = TC_pt->TC_SR;
    //* Suppress warning variable "dummy" was set but never used
    dummy = dummy;
    count_timer1_interrupt++;

    //* Read the output state
    /*
    if ( count_timer1_interrupt%2 )
    {
        AT91F_PIO_ClearOutput( AT91C_BASE_PIOB, LED3 );
    }
    else
    {
        AT91F_PIO_SetOutput( AT91C_BASE_PIOB, LED3 );
    }
    */
    AT91F_DBGU_Printk("timer1_interrupt:%i\n\n\r");
    //TRACE_INFO("counter_timer1_interrupt:%i\n\n\r",count_timer1_interrupt);
}
//*-------------------------- External Function -------------------------------

//*----------------------------------------------------------------------------
//* Function Name       : timer_init
//* Object              : Init timer counter
//* Input Parameters    : none
//* Output Parameters   : TRUE
//*----------------------------------------------------------------------------

void timer2_init ( void )
//* Begin
{
    //init the timer interrupt counter
	count_timer2_interrupt = 0;
	
    //* Open timer2
	AT91F_TC_Open(AT91C_BASE_TC2,AT91C_TC_CLKS_TIMER_DIV5_CLOCK | AT91C_TC_CPCTRG,AT91C_ID_TC2);

    //* Open Timer 2 interrupt
	AT91F_AIC_ConfigureIt ( AT91C_BASE_AIC, AT91C_ID_TC2, TIMER2_INTERRUPT_LEVEL,AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, timer2_c_irq_handler);
	AT91C_BASE_TC2->TC_IER = AT91C_TC_CPCS;  //  IRQ enable CPC
	AT91F_AIC_EnableIt (AT91C_BASE_AIC, AT91C_ID_TC2);
//        AT91C_BASE_TC2->TC_RC = 0xb764;//for 1s
        AT91C_BASE_TC2->TC_RC = 0xFFF8;

     //* Start timer0
        AT91C_BASE_TC2->TC_CCR = AT91C_TC_SWTRG ;

//* End
}

void timer1_init ( void )
//* Begin
{
    //init the timer interrupt counter
    count_timer1_interrupt=0;

    //* Open timer1
	AT91F_TC_Open(AT91C_BASE_TC1,AT91C_TC_CLKS_TIMER_DIV4_CLOCK | AT91C_TC_CPCTRG,AT91C_ID_TC1);

    //* Open Timer 1 interrupt
	AT91F_AIC_ConfigureIt ( AT91C_BASE_AIC, AT91C_ID_TC1, TIMER1_INTERRUPT_LEVEL,AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, timer1_c_irq_handler);
	AT91C_BASE_TC1->TC_IER  = AT91C_TC_CPCS;  //  IRQ enable CPC
	AT91F_AIC_EnableIt (AT91C_BASE_AIC, AT91C_ID_TC1);
//        AT91C_BASE_TC1->TC_RC = 0x3fff;
        AT91C_BASE_TC2->TC_RC = 0xf764;
    //* Start timer1
        AT91C_BASE_TC1->TC_CCR = AT91C_TC_SWTRG ;

//* End
}