Reads DIO channel
This function reads DIO channel input state.
Function will return an error if DIO channel is configured as input or has alternative function (ENC1, ENC2, PWM1, PWM2, PWM3, UART). Selected DIO channel should be configured as a DIO function, if ENC1, ENC2, PWM1, PWM2, PWM3 or UART function is enabled on selected DIO channel, mdaqDIOFunc function should be used to disable it.
dio:DIO channel number
state: DIO channel state