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pc8 problem on stm32f4

Question asked by delos_reyes.kristian on Feb 14, 2013

i failed in portc0 as input... as it has a output voltage of 2++ so i dont want to play tug of war with that voltage as I don't want to cause any damage so instead of pc0-pc7 i have used pc1-pc8

anyweyz instead i tried pc8 now heres another trivia

my code is

Data = 255 - (GPIOC ->IDR>>1 & 0x00FF) ;
so in my portc.1-portc.8 heres my input ->00111111

I expect my data to be 3 but what comes out is 131 so there's an excess 128

when i try portc.1-portc.8 heres my input ->00111110
I expect my data to be 131 but what comes out is 3 so there's a missing 128

when i try portc.1-portc.8 heres my input ->11111111
I expect my data to be 0 but what comes out is 128 so there's an excess 128

my portc.8 is being inverted in nature.. is there something wrong with what i did?

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