LIS3DH Analog input?

[espruino-discuss]

Posted at 2021-06-16 by billsalt

Hi All,
I'm wanting to use the LIS3DH analog inputs along with accelerometer. I'm getting totally lost on addressing, it would appear. When I set it up using the LIS3DH module using the default address and read the accelerometer, everything is fine. When I try the following setup, I2C1.read returns a timeout error.

Gotta be something very simple that I'm doing wrong; help?

Thanks!

I2C1.setup({sda:B7, scl:B6});

var addr = 0x18; //chip addr
read = function(reg, len) {
  I2C1.writeTo(addr, reg);
  return I2C1.readFrom(addr, len);
};
write = function(reg, data) {
  I2C1.writeTo(addr, [reg, data]);
};


console.log(read(0x08,2));

[espruino-discuss]

Posted at 2021-06-17 by @gfwilliams

It seems from http://www.espruino.com/modules/LIS3DH.js that the default address is 25 (0x19) - so that could be it?

Also, if you've set up the LIS3DH module nothing stops you from calling acc.r(reg_addr) and acc.wr(reg_addr,data) which might save you some duplication.

---

Posted at 2021-06-17 by billsalt

Thanks @gfwilliams! I kept reading 0x18 in the documentation, but on closer look I do indeed have it at 0x19. Also appreciate your suggestions of using acc.r/w.

I'm now talking to the chip, but having issues getting the A/D turned on. I'll spend some more time on it, but right now I'm not getting any values out of the A/D register (after writing the enabling bits). I'll spend more time later today on this, but appreciate your guidance as always!

Bill