export const CHIP = {
  // The consifuration byte is ['NULL','INTPOL','ODR','HAEN','DISSLW','SEQOP','MIRROR','BANK']
  // see page 18 of 23017 datasheet for 8 setting details
  // MUST send '10000000' to 0x0B first to be sure you are in BANK=1 separate bank mode
  // IOCON.BANK=0 (msb) at powerup so need to use 0x0A, if set to 1 then us
  default: {
    val: '10100010', // Split Banks port A + 0x10 = Port B,(ignored by 23008), Sequential operation disabled, active high=pulldown
    fmt: 'STR'
  },
  oneInt: {
    val: '11100100', // same as default execpt interupt pins of port A and B are connected
    fmt: 'STR'
  },
  intPullup: {
    val: '10100000', // same as default execpt interupt pins active=low means pullup (high and go low on trip)
    fmt: 'STR'
  },
  intPullupOneInt: {
    val: '10100000', // same as intPullup and oneInt combined
    fmt: 'STR'
  }
}

export const PIN = {
  setting: {  // these are the mcp registers = command for each setting
    dir: 0,  // IODIR  0=output 1=input
    ivrt: 1, // IPOL will report the opposite state if set
    intr: 2,  //GPITEN  1= pin will throw interrupt  (following registers are for interrupt)
    pullup: 6, // GPPU  1=internal pullup  0=none
    usedef: 4,  // INTCON - 0= interrupt on any change, 1= interrupt on change of value from defval
    defval: 3, // DEFVAL default value for interrupt comparison - usedef must be set
  },
  cfgset:{
    output: {
      dir: 0, // 0 output,1 input
      ivrt: 0,
      pullup: 0,
      intr: 0, // if intr = 0 usedef,deval not used
      usedef: 0, // if usedef = 0 defval not used
      defval: 0
    },
    input: {
      dir: 1, // 0 output,1 input
      ivrt: 0,
      pullup: 0,
      intr: 0, // if intr = 0 usedef,deval not used
      usedef: 0, // if usedef = 0 defval not used
      defval: 0
    },
    input_interrupt: { // includes pullup by default
      dir: 1, // 0 output,1 input
      ivrt: 1, // for reading let 1 be zero and vice versa
      pullup: 1,
      intr: 1, // if intr = 0 usedef,deval not used
      usedef: 0, // if usedef = 0 defval not used
      defval: 0
    },
    input_interrupt_ext_up: {
      dir: 1, // 0 output,1 input
      ivrt: 1, // for reading let 1 be zero and vice versa
      pullup: 0, // use external pullup 5V with external resister!
      intr: 1, // if intr = 0 usedef,deval not used
      usedef: 0, // if usedef = 0 defval not used
      defval: 0
    },
    input_interrupt_ext_down: {
      dir: 1, // 0 output,1 input
      ivrt: 0, // for reading let 1 be zero and vice versa
      pullup: 0, // use external pulldown
      intr: 1, // if intr = 0 usedef,deval not used
      usedef: 0, // if usedef = 0 defval not used
      defval: 0
    },
    momentary_interrupt: {
      dir: 1, // 0 output,1 input
      ivrt: 1, // for reading let 1 be zero and vice versa
      pullup: 1,
      intr: 1, // if intr = 0 usedef,deval not used
      usedef: 1, // if usedef = 0 defval not used
      defval: 1  // only throw interrupt when switch closes (1 becasue ivrt is 1)
    }
  },
  cmd: {
    intf: 7, // readonly
    intcap: 8, // readonly
    gpio: 9, // read/write
    olat: 10 // read only
  }
}