Exploring DRV3388 2xH-Bridge 2.7..10.8V 1.5A for 3.3V control (2..5.75V)

The whole chip is controlled with a negSleep signal - like a +chipSelect. Each bridge is controlled with two (2) leads: one is for direction and mode, the other is for PWM - very simple. The breakout board was very cheap. It has only minimal pins... the current control is disabled / tied to ground. A negFault is provided as output indicating signal faults, over current, over temperature, and under voltage.

// DRV3388test.js

var ms =        // motors
    [ {}        // motor 0 does not exist
    , { id: 1   // motor 1
      , dr: 0   // direction 2/1/0/-1-2 f/s-forw/stop/rev-s/f
      , sp: 0   // speed / duty 0..1
      , ps:     // pins
        [ B8    // DRV3388 AIN1  (BRD7)
        , B9    // DRV3388 AIN2  (BRD8)
        ]
      }
    , { id: 2   // motor 2
      , dr: 0   // direction 2/1/0/-1-2 f/s-forw/stop/rev-s/f
      , sp: 0   // speed / duty 0..1
      , ps:     // pins
        [ B6    // DRV3388 BIN1  (BRD11)
        , B7    // DRV3388 BIN2  (BRD12)
        ]
      }
    ]
  , slp=B10     // DRV3388 nSleep (BRD1)
  , flt=B1      // DRV3388 nFault (BRD6)
  , fltInd=LED1 // fault indicator
  , fltWId=null // fault watch id
  , onInd=LED2  // on indicator (not sleep)
  , on=false    // false not active
  , frq=1200    //
  , ddf=1.20    // duty delta faster as fraction
  , dds=0.84    // duty delta slower as fraction
//  , ddf=1.11    // duty delta faster as fraction
//  , dds=0.90    // duty delta slower as fraction
  , dmn=0.24    // duty min as fraction
  , dmx=1.00    // duty max as fraction
  , sbt=A10     // slower button (blue)
  , sbtWId=null // slower button watch id
  , fbt=A0      // faster button (red)
  , fbtWId=null // faster button watch id
  , rpt=150     // repeate check interval
  , cmi=1       // current motor id
  ;


function doFlt(e) {
  digitalWrite(fltInd, ! e.state);
}

function setup() {
  if (fltWId) fltWId=clearWatch(fltWId);
  if (sbtWId) sbtWId=clearWatch(sbtWId);
  if (fbtWId) fbtWId=clearWatch(fbtWId);
  pinMode(slp,"output");
  pinMode(flt,"input");
  ms.forEach(function(m,x){ if (x>0) {
    m.dr=0;
    m.sp=0;
    pinMode(m.ps[0],"output");
    pinMode(m.ps[1],"output");
    stp(x); }}); // stop
  on(0);
  fltInd.reset();
  fltWId=setWatch(doFlt,flt
            ,{edge:"both",repeat:true});
  pinMode(sbt,"input_pullup");
  pinMode(fbt,"input_pullup");
  sbtWId=setWatch(slower,sbt
           ,{edge:"falling",repeat:true,debounce:10­});
  fbtWId=setWatch(faster,fbt
           ,{edge:"falling",repeat:true,debounce:10­});
}

function ffd(mid,dty) { // forward fast decay w/ duty
  var m=ms[mid], ps=m.ps;
  if (m.dr!=2) { m.dr=2;
    digitalWrite(ps,0); }
  console.log("f:",Math.round(dty*100));
  analogWrite(ps[0],m.sp=dty,{freq:frq});
}
function fsd(mid,dty) { // forward slow decay w/ duty
  var m=ms[mid], ps=m.ps;
  if (m.dr!=1) { m.dr=1;
    digitalWrite(ps,0); }
  digitalWrite(ps[0],1);
  console.log("f:",Math.round(dty*100));
  analogWrite(ps[1],m.sp=dty,{freq:frq});
}
function rfd(mid,dty) { // reverse fast decay w/ duty
  var m=ms[mid], ps=m.ps;
  if (m.dr!=-2) { m.dr=-2;
    digitalWrite(ps,0); }
  console.log("r:",Math.round(dty*100));
  analogWrite(ps[1],m.sp=dty,{freq:frq});
}
function rsd(mid,dty) { // forward slow decay w/ duty
  var m=ms[mid], ps=m.ps;
  if (m.dr!=-1) { m.dr=-1;
    digitalWrite(ps,0);
    digitalWrite(ps[1],1); }
  console.log("r:",Math.round(dty*100));
  analogWrite(ps[0],m.sp=dty,{freq:frq});
}
function stp(mid) {
  global["rfdrsdnopfsdffd".substr(6+ms[mid­].dr*3,3)](mid,0);
}

function slower(e,mid) {
  var d=ms[mid=mid||cmi].sp*=dds;
  if (d<dmn) {
    stp(mid);
  } else {
    global["rfdrsdnopfsdffd".substr(6+ms[mid­].dr*3,3)](mid,d);
  } setTimeout(more,rpt,sbt,slower);
}
function faster(e,mid) {
  var s=ms[mid=mid||cmi].sp,d=(s<dmn)?dmn:((d=­s*=(ddf))>dmx)?dmx:d;
  global["rfdrsdnopfsdffd".substr(6+ms[mid­].dr*3,3)](mid,d);
   setTimeout(more,rpt,fbt,faster);
}
function more(btn,sorf) {
  if ( ! digitalRead(btn)) sorf();
}
  
function on(on) {
  on=on||on===undefined;
  digitalWrite(slp,on);
  digitalWrite(onInd,on);
}

function nop(){}

function hlt(){ onInit(); }

function onInit() {
  setup();
  on();
  ms[1].dr=2;
  ms[2].dr=2;
}

setTimeout(onInit,999); // while dev'g, remove before upload for save()