How to read directly from Serial1? (baby steps into CASIC)

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•

HughB

to shut NMEA output you can use CAS06 with 0 for all types.

I got CAS06 as product information. I think its CAS03 to set the outputs

None of these attempts worked for me.

// try and slow the output down 
function cas02() {
  // example $PCAS02,1000*2E  - 1 second in milliseconds
  sendCommand("CAS02,5000");  // does not work
}

// try and stop the NMEA output
function stp() {
  //example:  $PCAS03,1,1,1,1,1,1,1,1,0,0,,,1,1,,,,1*33
  // attempt no output - did not work
  //sendCommand("CAS03,0,0,0,0,0,0,0,0,0,0,,,0,0,,,,0");
  // attempt every 100, does not work
  sendCommand("CAS03,100,100,100,100,100,100,100,100,100,100,,,100,100,,,,100");
}

I can see gnss.setSentencesAll("0"); in your code, so assume that works for you.

 gnss.setSystems(1,0,0);
  gnss.setSentencesAll("0");
  gnss.setSentences({RMC:"1"});
  gnss.setUpdateRate(500);

Not to worry, I'm more interested in the CASIC controls to get the NAV frequency down to once every 2 minutes.

I'm working on trying to get a checksum function to work.
I will test it from the output of your parse_casic code.

•

Mark_M in reply to @HughB

@HughB

Not to worry, I'm more interested in the CASIC controls to get the NAV frequency down to once every 2 minutes.

I doubt it is possible.
I've made code that can set intervals 1000, 500, 200,100,50(yes, 20Hz!). But for other values it returns NACK.

function ckSum(len,cls,mid, pldDV){
  var cs = (mid<<24)|(cls<<16)|len;
  for(var i=6; i<pldDV.buffer.length; i+=4){
    print(i, pldDV.getUint32(i, true));
    cs += pldDV.getUint32(i, true);
  }
  print(cs.toString(16));
  return cs;
}
const UD='undefined';
function sendCfgRate(cfg){
  const cls=0x06, mid=0x04;
  var len = (typeof(cfg.interval)!=UD)?4:0;
  var msg = new ArrayBuffer(6+len+4);
  var dv = new DataView(msg);
  dv.setUint8(0,0xBA); dv.setUint8(1,0xCE);
  dv.setUint16(2, len, true);
  dv.setUint8(4,cls); dv.setUint8(5,mid);

  if(typeof(cfg.interval)!=UD){dv.setUint16(6+0,cfg.interval,true);}
  cs = ckSum(len,cls,mid,dv);
  dv.setUint32(6+len,cs, true);
  print(msg);
  Serial2.write(msg);
}

sendCfgRate({interval:10000})
6 10000
10 0
4062714
new Uint8Array([186, 206, 4, 0, 6, 4, 16, 39, 0, 0, 20, 39, 6, 4]).buffer
=undefined
{ "hdr": 47822, "len": 4,
  "payload": new Uint8Array([6, 4, 0, 0]).buffer,
  "payloadBytes": new Uint8Array([6, 4, 0, 0]),
  "class": 5, "msgId": 0, "checkSum": 168035584,
  "name": "ACK-NACK"
 }
>

How to read directly from Serial1? (baby steps into CASIC)

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