HTCC-AB02S GPS green LED next to USB port

#1

Hi out there, im just starting to use AB02S GPS Module.

If GPS is working an small green LED beside the USB port ist flashing, not the RGB LED!
I want to stop this LED flashing, but i can’t find anything about this in the code.

On shematic I think it is LED D6 on IO8 / GPIO8, but on th Pinout Diagram there is on GPIO8 only SCL1.
But on GPIO12 there is GPS_LED, only going to header P2.

Need here some clarification and where to turn this LED off.

#2

You can’t turn it off because it is driven by GPS chip. Look at GPS chip. It has GPIO8. The options we have is 1) cut its line off, 2) break the green LED. Maybe 2) is the best choice for us.

#3

hi,

For now, you can only remove it using physical methods

#4

Thanks, this port on GPS module i havn’t seen, writings is little bit overlapped.

#5

Please, could you inform if you can get in to power deep sleep with this led flashing? or should I switch off the GPS in cycles? would it “catch up” cycling?

#6

complementing: it looks there is a problem of acquiring GPS signal back after some cycles

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#7

Yes, since v1.4 old cubecell AIR530 (no AIR530Z) stops sending after a while.
It gets stuck after
GPS Current baudrate detecting…

#8

Thats a bug in the hardware serial driver have a look at bugs on github

#9

Apparently there is an update to HardwareSerial.cpp found here that should fix the issue. Didn’t test it yet.

#10

Today I was able to turn PPS LED off by sending CASIC CFG-TP command:

  ....
  GPS.begin();
  delay(10);
  char cfgtp[] = {
    0xBA, 0xCE, 0x10, 0x00, 0x06, 0x03, 0x40, 0x42, 0x0F, 0x00, 0xA0, 0x86, 0x01,
    0x00, 0x00, 0x00, 0x01, 0x05, 0x00, 0x00, 0x00, 0x00, 0xF0, 0xC8, 0x17, 0x08 
  };
  GPS.sendcmd(String(cfgtp));
  ...

Here are some docs in case some needs to know how it works: GPS_CASIC_documentation (pdf)

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