int_test.c

arm7 s3c44b0的的键盘驱动 无操作系统可用

/*********************************************************************************************
* File：	int_test.c
* Author:	embest
* Desc：	the extern interrupt source test
* History:	
*********************************************************************************************/

#include	"44blib.h"
#include	"44b.h"
#include	"def.h"

/*------------------------------------------------------------------------------------------*/
/*                                     function declare                                     */
/*------------------------------------------------------------------------------------------*/
void init_int(void);
void int_test(void);
void int4567_isr(void);// __attribute__ ((interrupt ("IRQ")));

/*------------------------------------------------------------------------------------------*/
/*                                     global variables                                     */
/*------------------------------------------------------------------------------------------*/
unsigned char f_ucIntNesting = 0;			// Interrupt nesting count
unsigned char f_ucWhichInt   = 0;			// interrupt source symbol

/*********************************************************************************************
* name:		init_int
* func:		initialize the extern interrupt control
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void init_int(void)
{
	// interrupt settings
	rI_ISPC    = 0x3ffffff;					// clear interrupt pending register
	rEXTINTPND = 0xf;						// clear EXTINTPND register
	rINTMOD    = 0x0;						// all for IRQ mode
	rINTCON    = 0x5;						// nonVectored mode, IRQ disable, FIQ disable    
	rINTMSK    = ~(BIT_GLOBAL|BIT_EINT4567);
		
	// set EINT interrupt handler
	pISR_EINT4567 = (int)int4567_isr;
    
	// PORT G configuration
	rPCONG  = 0xffff;						// EINT7~0
	rPUPG   = 0x0;							// pull up enable	    
	rEXTINT = rEXTINT | 0x22220020;			// EINT4567 falling edge mode	
	rI_ISPC |=  BIT_EINT4567;
	rEXTINTPND = 0xf;						// clear EXTINTPND reg
}

/*********************************************************************************************
* name:		int_test
* func:	
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void int_test(void)
{
	unsigned int unSaveG,unSavePG,key_flag;
 
	init_int();
	key_flag = 0;
	rINTMSK = rINTMSK | BIT_EINT4567;		// disable EINT2 int
	// user interface
	uart_printf("\n\r External Interrupt Test\n");   
	uart_printf(" Please Select the trigger:\n"
				"  1 - Falling trigger\n"
				"  2 - Rising trigger\n"
				"  3 - Both Edge trigger\n" 
				"  4 - Low level trigger\n"
				"  5 - High level trigger\n"
				"  any key to exit...\n");				
    
	// save the current settings of Port G controler
	unSaveG = rPCONG;
	unSavePG= rPUPG;
	rPCONG  = 0xf5ff;						// EINT7~0
	rPUPG   = 0x0;							// pull up enable
    
    rEXTINT = 0x22222222;			// Falling edge mode 
    
	uart_printf(" Press the buttons \n");
	uart_printf(" push buttons may have glitch noise problem \n");
	rINTMSK = ~(BIT_GLOBAL | BIT_EINT4567);
while(1)
{    	  
	while(!f_ucWhichInt)
	     {
	     	if(key_flag==0)
	     	led_test();
	     	else if(key_flag==1)
	     	leds_off();
	     }					// waiting for the interrupt
	f_ucIntNesting = 1;						// Allow to Nesting.

	switch(f_ucWhichInt)
	 {
		case 1:
			uart_printf(" EINT4 had been occured... \n");
			break;
		    
		case 2:
			uart_printf(" EINT5 had been occured...\n");
			break;
		    
		case 4:								// SB2 --- flash LED1
			uart_printf(" EINT6 had been occured... LED1 (D1204) on\n");
			
			// flesh LED1
//			leds_off();
//			led1_on();
//			delay(10000);					// 10000 x 100 us
//			led1_off();
            if(key_flag == 0)
            key_flag = 1;
            else if(key_flag == 1)
            key_flag = 0;
            uart_printf(" key_flag = %d\n",key_flag); 
			break;
		    
		case 8:								// SB3 --- flash LED2
			uart_printf(" EINT7 had been occured... LED2 (D1205) on\n");
			leds_off();
			// flesh LED2
//			led4_on();
//			delay(10000);					// 10000 x 100 us
//			led4_off();
			break;
		    
		case 9:
			uart_printf(" The extern interrupt had been occured (1 level mode)\n");
		    break;
		    
		default :
			uart_printf(" Error!\n");
			break;
	  }
	
	// reset the global variables
	f_ucWhichInt = 0;						// interrupt source symbol
	f_ucIntNesting = 0;
	
	// restore the Port G controler value
	rPCONG = unSaveG;
	rPUPG  = unSavePG;
}
}

/*********************************************************************************************
* name:		int4567_isr
* func:	
* para:		none
* ret:		none
* modify:
* comment:		
*********************************************************************************************/
void int4567_isr(void)
{
	delay(10);
	f_ucWhichInt  = rEXTINTPND;
	uart_printf(" EINT.. \n");
	if(f_ucIntNesting)
	{
	f_ucIntNesting++;					// an extern intrrupt had been occur before dealing with one.
        delay(100);
        uart_printf(" f_ucIntNesting = %d\n",f_ucIntNesting);
	}

	rEXTINTPND = 0xf;						// clear EXTINTPND reg.		
	rI_ISPC   |=  BIT_EINT4567;				// clear pending_bit

}