MSP430F5529: Reading 4 specific pins and interfacing gsm module

Nir Bar

Part Number: MSP430F5529
Other Parts Discussed in Thread: ENERGIA

Hello
Im doing my first MSP430 project for Uni and Im using P1.2 , P1.3, P1,4 and P1,5 as interrupt pins such that when their value is changing im doing some kind of operation on the current input string.

The pins are physically connected to an external 4-bit string generator.

How should I read the specific above pins (parallel of course)?

I configured them as interrupt pins . In order to isolate the specific pins from port 1 I used the AND operation like - P1 & 0x3C but it doesn't work.

Any suggestions?

How can I debug this proccess and see P1 pins values on any given time?

Thank you,

Nir.

over 9 years ago

0 Clemens Ladisch over 9 years ago

Guru 325730 points

According to your description, "P1IN & 0x3C" should be correct.

What do you mean with "doesn't work"? What did you expect, and what actually happened?

0 Nir Bar over 9 years ago in reply to Clemens Ladisch

Prodigy 95 points

Is P1IN a 8 bit register that holds the 8 pins of P1?
I just wrote P1in my code.

Moreover, should I use detachinterrupt() when I finished my operation on the current 4 bit string and want to keep waiting to the next string?
Or it will generally disable the interrupt capabilty for that specific pin?
(Im coding with Energia)

Thanks,

Nir.

0 Clemens Ladisch over 9 years ago in reply to Nir Bar

Guru 325730 points

Yes, P1IN is an eight-bit register for all eight input.

detachInterrupt() will disabled all further interrupts.

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MSP430F5529: Reading 4 specific pins and interfacing gsm module