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Post: There are two functions for setting the direction of pins. io_set_pin_direction can be used to set the direction of an individual pin. [b]io_set_pin_direction(unsigned char pin, unsigned char direction)[/b] takes two parameters. [b]pin [/b]- 1 to 16 [b]direction [/b]- 1 = input, 0 = output The IO bus is split into two ports, port 0 controls pins 1 to 8 and port 1 controls pins 9 to 16. You can set the direction of a port using the io_set_port_direction function. [b]io_set_port_direction(unsigned char port, unsigned char direction)[/b] takes two parameters. [b]port [/b]- 0 = pins 1 to 8, port 1 = pins 9 to 16 [b]direction [/b]- an 8-bit value of 0 to 255, or 0x00 to 0xFF in hex. Each of the 8 bits represents a pin on the port with pin 1 being the lowest or rightmost bit. So to set pins 1 to 4 as inputs and 5 to 8 as outputs you would use a value of 0b00001111 or 15 in decimal, 0x0F in hex.