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//Macros to quickly modify gpio values
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#define GPIOMOD(port, mask, bits) (* (pREG32 (0x50000000+(0x10000*port)+(mask<<2))))=bits
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#define GPIOSET(port, bits) GPIOMOD(port, (1<<bits), (1<<bits));
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#define GPIOCLEAR(port, bits) GPIOMOD(port, (1<<bits), 0);
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