Configure Port2 pin as an interrupt

EINT3 is bound to P2.13. However, you can setup a "GPIO interrupt" for pins on P0 and P2.

Pin

Could u please let me know how to setup "GPIO interrupt" for

From Chapter 10, section 5.6, using P2 bit 7 falling edge as an example, and with the PINSEL and DIR registers already setup:

IO2IntEnF |= 0x00000080; VICIntEnable |= 0x00020000; VICVectAddr17 = ExtInt3Isr; VICVectPriority17 = EINT3_PRIORITY;

Your compiler may have different symbolic names for the registers, and a symbolic name should probably be used for the VIC channel to mitigate typing errors.

Thanks a lot Rich.

Your posting did help me a lot, but didn't work as desired. I wanted to generate an interrupt for the first falling edge of a clock cycle. But now, inspite of absence of a falling edge an interrupt is generated for the corresponding Pin.

Here i have configured P2.7(CLOCK Signal) as a GPIO Pin which generates an interrupt in External

Port2.7

Thanks a lot Rich for your kind and timely response.

Here i have configured P2.7(CLOCK) as a GPIO Pin which is configured to generate an interrupt on External Interrupt3 if a falling edge is detected. Now, when my device is connected, an interrupt is generated inspite of absence of a falling edge.

I have pasted my source code below for your kind reference. Please help me in this regard.

/****************************KBW_CLK[P2.7]********************************************/ PINSEL4 =( (PINSEL4 & 0xFFFF3FFF)|0x00000000); //P2.7 KBW_CLK as GPIO Pin

FIO2DIR =((FIO2DIR & 0xFFFFFF7F) | 0x00000000); //P2.7 KBW_CLK configure as input.

PINMODE4 =( ( PINMODE4 & 0xFFFF3FFF ) | 0x00000000); //p2.7 'pull up' enabled.

/*************************************************************************************/

/****************************KBW_DATA[P2.11]******************************************/ PINSEL4 =( ( PINSEL4 & 0xFF3FFFFF ) | 0x00000000 ); //p2.11 KBW_DATA; Set as GPIO

FIO2DIR =((FIO2DIR & 0xFFFFF7FF) | 0x00000000); //P2.11 KBW_DATA configure as input.

PINMODE4 = ( ( PINMODE4 & 0xFF3FFFFF ) | 0x00000000); //p2.11 KBW_DATA; 'pull up' enabled.

/*************************************************************************************/

EXTMODE = ( ( EXTMODE & 0xF7 ) | 0x08 ); //p2.7 edge Sensitive

EXTPOLAR = ( ( EXTPOLAR & 0xF7 ) | 0x00 ); //P2.7 Active LOW

EXTINT |= EINT3; //Interrupt Flag to be cleared before making any changes in EXTMODE and EXTPOLAR

IO2_INT_CLR = ( ( IO2_INT_CLR & 0x7F) | 0x80); //CLEAR P2.7 GPIO Int Status

IO2_INT_EN_F = ( ( IO2_INT_EN_F & 0x7F) | 0x80 ); //enable Falling Edge on Port2.7

VIC>

Port2.7