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// set GPN0 as Ext.Interrupt[0]
v_pIOPregs->GPNCON &= ~(0x3<<0);
v_pIOPregs->GPNCON |= (0x2<<0);
// pull up
v_pIOPregs->GPNPUD &= ~(0x3<<0);
v_pIOPregs->GPNPUD |= (0x2<<0);
// EINT1,0 falling edge triggered
v_pIOPregs->EINT0CON0 &= ~(0x7<<0);
v_pIOPregs->EINT0CON0 |= (0x2<<0);
// Enable Interrupt EINT0
v_pIOPregs->EINT0MASK &= ~(0x1<<0);
// EINT0~EINT3 belongs to INT_EINT0(VIC0)
// set INT_EINT0 as FIQ type
//v_pVIC0Pregs->VICINTSELECT |= (0x1<<0);
// set INT_EINT0 as IRQ type
v_pVIC0Pregs->VICINTSELECT &= ~(0x1<<0);
// Enable INT_EINT0 interrupt
v_pVIC0Pregs->VICINTENABLE |= (0x1<<0);
static void InitializeVIC(void)
{
// Disable All Interrupts
g_pVIC0Reg->VICINTENCLEAR = 0xFFFFFFFF;
g_pVIC1Reg->VICINTENCLEAR = 0xFFFFFFFF;
g_pVIC0Reg->VICSOFTINTCLEAR = 0xFFFFFFFF;
g_pVIC1Reg->VICSOFTINTCLEAR = 0xFFFFFFFF;
// Clear Current Active Vector Address
g_pVIC0Reg->VICADDRESS = 0x0;
g_pVIC1Reg->VICADDRESS = 0x0;
// Initialize Vector Address Table
VICTableInit();
// Disable Vectored Interrupt Mode on CP15
System_DisableVIC();
// Enable IRQ Interrupt on CP15
System_EnableIRQ();
// Enable FIQ Interrupt on CP15
System_EnableFIQ();
}