What's different PCR[ISF] & ISFR in interrupt usage in GPIO mode ?

rqbh — Mon, 17 Mar 2014 06:34:47 GMT

Now I using 4 GPIOs ( PORTC 1,2,3,4 ) as keypads in a K20DX128VLF5, configuring them enter interrupt with falling edge,

when enter interrupt , we do flow code:

//----------------------------------------

void PORTC_ISR(void)

{

if(PORT_PDD_GetPinInterruptFlag(PORTC_BASE_PTR, PORT_PDD_PIN_1)

|| (PORT_PDD_GetInterruptFlags(PORTC_BASE_PTR)&PORT_PDD_PIN_1)){

PORT_PDD_ClearPinInterruptFlag(PORTC_BASE_PTR, PORT_PDD_PIN_1);

PORT_PDD_ClearInterruptFlags(PORTC_BASE_PTR, PORT_PDD_PIN_1);

KEY_1();

}

if(PORT_PDD_GetPinInterruptFlag(PORTC_BASE_PTR, PORT_PDD_PIN_2)

|| (PORT_PDD_GetInterruptFlags(PORTC_BASE_PTR)&PORT_PDD_PIN_2)){

PORT_PDD_ClearPinInterruptFlag(PORTC_BASE_PTR, PORT_PDD_PIN_2);

PORT_PDD_ClearInterruptFlags(PORTC_BASE_PTR, PORT_PDD_PIN_2);

KEY_2();

}

if(PORT_PDD_GetPinInterruptFlag(PORTC_BASE_PTR, PORT_PDD_PIN_3)

|| (PORT_PDD_GetInterruptFlags(PORTC_BASE_PTR)&PORT_PDD_PIN_3)){

PORT_PDD_ClearPinInterruptFlag(PORTC_BASE_PTR, PORT_PDD_PIN_3);

PORT_PDD_ClearInterruptFlags(PORTC_BASE_PTR, PORT_PDD_PIN_3);

KEY_3();

}

if(PORT_PDD_GetPinInterruptFlag(PORTC_BASE_PTR, PORT_PDD_PIN_4)

|| (PORT_PDD_GetInterruptFlags(PORTC_BASE_PTR)&PORT_PDD_PIN_4)){

PORT_PDD_ClearPinInterruptFlag(PORTC_BASE_PTR, PORT_PDD_PIN_4);

PORT_PDD_ClearInterruptFlags(PORTC_BASE_PTR, PORT_PDD_PIN_4);

KEY_4();

}

//--------------------------------

The problem is :

1 \ KEY_2 and KEY_4 cann't be detected , but the all out circuit are same( 10K pull-up, 0.1uf filter ).

2 \ Are we must to check both ISFR and PCR[ISR] to confirm the interrupt index?

3 \ As bove, are we must to clear both register bit when enter ISR routine ?

Re: What's different PCR[ISF] & ISFR in interrupt usage in GPIO mode ?

Kan_Li — Wed, 19 Mar 2014 02:15:14 GMT

Hi Kevin,

Clearing ISFR by writing one is enough to clear the Port interrupt flags, as well as checking interrupt status. I can not figure out why KEY_2 and KEY_4 can not be detected with the above information, would you please send a snapshot of the schematics for a review, if you can send me the project or more code snippets for POTRC 1,2,3,4 initlization, that would be better.

Thanks for your patience!!

Have a great day,
Kan

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topic What's different PCR[ISF] & ISFR in interrupt usage in GPIO mode ? in Kinetis Microcontrollers

What's different PCR[ISF] & ISFR in interrupt usage in GPIO mode ?

Re: What's different PCR[ISF] & ISFR in interrupt usage in GPIO mode ?