I'm working on a project using msp430. How can i read the value received by a specific port and assign it to a variable? Like P1.5 ? I already set P1DIR to input. I did:
data = (P1IN & SDA_TMP); // Where SDA_TMP is a defined prep
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phlogratos
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Cheikh Ahmadou
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What is the value of SDA_TMP? – phlogratos Apr 14 '15 at 09:34
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What do you mean by "a defined prep"? – unwind Apr 14 '15 at 09:44
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SDA_TMP is : #define SDA_TMP (0x0020) – Cheikh Ahmadou Apr 14 '15 at 10:12
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Something like this:
const bool data = (P1IN & (1 << 5)) != 0;
This uses bitwise and (&) to mask out the fifth bit (whose value is 1 << 5), then does a comparison against zero. The result in data will be true if bit 5 is set, false if it isn't.
See also this tutorial for more.
unwind
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Ok thanks . That's what i was looking for... I'm coding in C, so i'll replace const bool by unsigned char – Cheikh Ahmadou Apr 14 '15 at 10:16