Posted on May 17, 2011 at 09:42Hello,
I'm facing a strange problem:
I configured P3.5 as EXT int.
from inside the irq handler I'm not able to
reset the irq assertion (WIU->PR = WIU_line5) so
the code is in loop in this irq !!!
If I execute the code step by step when I write to WIU->PR
the irq flag is reset.
any idea?
--- my config ---
VIC_ITCmd(EXTIT0_ITLine, DISABLE);
WIU_ClearITPendingBit(WIU_Line5); //P3.5
WIU_InitStructure.WIU_Mode = WIU_Mode_Interrupt ;
WIU_InitStructure.WIU_Line = WIU_Line5 ;
WIU_InitStructure.WIU_TriggerEdge = WIU_FallingEdge ;
WIU_Init(&WIU_InitStructure);
/* Select WIU line 5 as VIC1.10 interrupt source */
SCU_WakeUpLineConfig(5);
USB_Cable_Config( ENABLE );
VIC_Config(EXTIT0_ITLine, VIC_IRQ, 8);
VIC_ITCmd(EXTIT0_ITLine, ENABLE);
-----
irq handler:
void EXTIT0_IRQHandler(void)
{
static int busState = VBUS_CONNECTED;
register int pin_status = GPIO3->DR[GPIO_Pin_5<
if ( !pin_status )
{
/* trigger on rising edge */
WIU->TR |= WIU_Line5;
}
else
{
/* trigger on falling edge */
WIU->TR &= ~WIU_Line5;
}
// WIU->PR = 0xFFFFFFFC;
WIU->PR = WIU_Line5; // clear all pending events on port 3
}
