irq main.c

at91sam7 use PIO interrupt to finish PS2 protocl

// ----------------------------------------------------------------------------
//         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           : main.c
// Object              : main application written in C
// Creation            : JPP   08-Sep-2005
// ----------------------------------------------------------------------------

// Include Standard LIB  files
#include "project.h"

//*   Waiting time between AT91B_LED1 and AT91B_LED2
#define     WAIT_TIME       AT91B_MCK
#define KEY_CLK 1<<20//board PA22
#define KEY_DATA 1<<22 //board PA24
#define PIO_INTERRUPT_LEVEL     6
#define SOFT_INTERRUPT_LEVEL	2
#define FIQ_INTERRUPT_LEVEL     7  // Always high

//* Global variable
int count_timer0_interrupt;
int count_timer1_interrupt;

// Use the Library Handler defined in file periph/pio/pio_irq/irq_pio.s

extern void FIQ_init_handler(void);

// External Function Prototype
extern void timer_init (void );
extern void Usart_init (void);

extern void AT91F_DBGU_Init (void);
extern void AT91F_DBGU_Printk(char *buffer) ;
char strprint[30] = {0};
int i_data_number = 0;
//*----------------------------------------------------------------------------
//* Function Name       : key_interrupt_handle
//* Object              : Software interrupt function
//* CLK 
//*----------------------------------------------------------------------------
void f6_delay(int num){
int i= 0;
 for ( i = 0 ;i < num;i++ ) ;
}
//*----------------------------------------------------------------------------
//* Function Name       : aic_software_interrupt
//* Object              : Software interrupt function
//*----------------------------------------------------------------------------
void aic_software_interrupt(void)
{
    //* Read the output state
    if ( (AT91F_PIO_GetInput(AT91D_BASE_PIO_LED) & AT91B_LED2 ) == AT91B_LED2 )
    {
        AT91F_PIO_ClearOutput( AT91D_BASE_PIO_LED, AT91B_LED2 );
    }
}

//*----------------------------------------------------------------------------
//* Function Name       : pio_c_irq_handler
//* Object              : Irq Handler calAT91B_LED by the irq_pio.s
//*----------------------------------------------------------------------------
void pio_c_irq_handler ( void )
{
int dummy;
    //* Read the output state
    if ( (AT91F_PIO_GetInput(AT91D_BASE_PIO_LED) & AT91B_LED1 ) == AT91B_LED1 )
    {
       AT91F_PIO_ClearOutput( AT91D_BASE_PIO_LED, AT91B_LED1);
    }  else     {
       AT91F_PIO_SetOutput( AT91D_BASE_PIO_LED, AT91B_LED1);
    }
    //* enable the next PIO IRQ
    dummy =AT91D_BASE_PIO_SW->PIO_ISR;
    //* suppress the compilation warning
    dummy =dummy;
    //* while SW3 is push wait
    while ( (AT91F_PIO_GetInput(AT91D_BASE_PIO_SW) & AT91B_BP2 ) != AT91B_BP2 );
}
void key_interrupt_handle(void){
//	int i_data_number = 0;
	int j_parity = 0;
	int i_num =0;
	int over_time = 0;
	unsigned char over_time_mask = 0;
	int read_data = 0;
	int key_data = 0;
	unsigned char be_wrong = 0;
	int dummy;
	AT91F_DBGU_Printk("\r\n\r\nMASK:");
	AT91F_DBGU_Printk("key_interrupt_handle\r\n");
//	AT91F_PIO_InterruptDisable(AT91C_BASE_PIOA,KEY_CLK);
/*	while(1){
		//等待时钟端口为高电平
		while((AT91F_PIO_GetInput(AT91C_BASE_PIOA) & KEY_CLK)==0){
			//时间控制，避免死循环
			over_time++;
			if(over_time>CONTROL_TIME)break;	
		}
		//时间控制，避免死循环
		if(over_time>CONTROL_TIME){over_time_mask = 1;break;}
		over_time=0;

*/
		
		//读数据端口
		read_data = (AT91F_PIO_GetInput(AT91D_BASE_PIO_SW) & KEY_DATA)>>22;
		i_data_number++;
		sprintf(strprint,"read_data is %x.\r\n",read_data);
		AT91F_DBGU_Printk(strprint);
		sprintf(strprint,"i_data_number is %x.\r\n",i_data_number);
		AT91F_DBGU_Printk(strprint);

		
		//等待时钟端口为高电平
		while((AT91F_PIO_GetInput(AT91D_BASE_PIO_SW) & KEY_CLK)==0){
		//时间控制，避免死循环
			over_time++;
			if(over_time>CONTROL_TIME)break;
		}
		//时间控制，避免死循环
//		if(over_time>CONTROL_TIME){over_time_mask = 2;break;}
//		over_time=0;

//	}
	
//	f6_delay(500);
	//* enable the next PIO IRQ
 // 	dummy =AT91D_BASE_PIO_SW->PIO_ISR;
      //* suppress the compilation warning
 //     dummy =dummy;
      if(over_time>CONTROL_TIME){
      	sprintf(strprint,"over_time_mask is %x.\r\n",over_time_mask);
      	AT91F_DBGU_Printk(strprint);
      	}
 //     AT91F_PIO_InterruptEnable(AT91C_BASE_PIOA,KEY_CLK);
      AT91F_DBGU_Printk("end key_interrupt_handle\r\n");
}
//*----------------------------------------------------------------------------
//* Function Name       : delay
//* Object              : Wait
//*----------------------------------------------------------------------------
void delay ( void )
{
//* Set in Volatile for Optimisation
    volatile unsigned int    i ;
//* loop delay
    for ( i = 0 ;(i < WAIT_TIME/100 );i++ ) ;
}

//*----------------------------------------------------------------------------
//* Function Name       : main
//* Object              : Main interrupt function
//*----------------------------------------------------------------------------
int main( void )
//* Begin
{
    unsigned int   loop_count ;
    AT91PS_AIC     pAic;
    //* Load System pAic Base address
        pAic = AT91C_BASE_AIC;

    //* Enable User Reset and set its minimal assertion to 960 us
        AT91C_BASE_RSTC->RSTC_RMR = AT91C_RSTC_URSTEN | (0x4<<8) | (unsigned int)(0xA5<<24);
	//add by suminhua 2007-5-29 for debug
	AT91F_DBGU_Init();
	 AT91F_DBGU_Printk("START:\r\n");
     	loop_count = 0 ;
    // First, enable the clock of the PIO for led and PIO for Switch
        AT91F_PMC_EnablePeriphClock ( AT91C_BASE_PMC, 1 << AT91D_ID_PIO_LED ) ;

        AT91F_PIO_CfgInput(AT91D_BASE_PIO_SW, KEY_DATA );


        AT91F_AIC_ConfigureIt ( pAic, AT91C_ID_IRQ0,
	                              FIQ_INTERRUPT_LEVEL,
	                              AT91C_AIC_SRCTYPE_EXT_LOW_LEVEL,
	                              key_interrupt_handle);
       AT91F_AIC_EnableIt (pAic, AT91C_ID_IRQ0);
	while(1);
}