MSP430FR2433: MSP430FR2433

vadim piskun

Expert 2230 points

Part Number: MSP430FR2433

Hi,

The user guide for FR2433 says that input interrupt can happen only on positive or negative edge,

0b = PxIFG flag is set with a low-to-high transition
1b = PxIFG flag is set with a high-to-low transition

is there a way to trigger interrupt on both positive and negative edges?

thanks vadim

over 5 years ago

0 Cash Hao11 over 5 years ago

TI__Mastermind 39295 points

Hi Vadim,

It is not possible to do that.

Best regards,

Cash Hao

0 Bruce McKenney over 5 years ago

Guru 95715 points

As Cash Hao says, there's no setting that provides this function.

Two alternative methods: (1) reverse the IES on each interrupt (2) adopt a timer capture pin and use CM=3.

0 vadim piskun over 5 years ago in reply to Bruce McKenney

Expert 2230 points

Hi Bruce,

Thank you verymuch for your help! I was able to utilize your suggestion with this line

reverse = reverse^(0x1);
GPIO_selectInterruptEdge(
GPIO_PORT_P2,
GPIO_PIN4,
reverse
);

I tried to do the same by writing only to

P2IES = reverse;

but nothing happened

thanks vadim

0 Bruce McKenney over 5 years ago in reply to vadim piskun

Guru 95715 points

>reverse = reverse^(0x1);

Try:

> reverse = reverse ^ GPIO_PIN4;

Also be sure "reverse" is initialized appropriately.

[Edit: Wrong. See below.]

0 Bruce McKenney over 5 years ago in reply to Bruce McKenney

Guru 95715 points

Sorry, I should have looked more closely at the library source code. Your original code should have worked, given an appropriate initial value for "reverse".

I personally would have used:

> P2IES ^= BIT4; // Reverse P2.4 interrupt sense

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MSP430FR2433: MSP430FR2433