Reads DIO channel
state = mdaqDIORead(dio) state = mdaqDIORead(linkID, dio)
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). DIO Bank containing selected DIO channel should be configured as an output with mdaq_dio_dir function. 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.
linkID: Valid connection link ID (optional)
dio:DIO channel number
state: DIO channel state