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towlerg
Joined: 04 Dec 2011
Posts: 4
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| Very Noob question re. VL6180 driver [Solved] |
 Posted: Sun Feb 17, 2019 9:32 am |
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Sorry if this is dumb question but ...
In the VL6180 drive (VL6180.C) there a bunch of I2C write to undocumented registers -
| Code: | ps_write_reg(0x0207, 0x01);
ps_write_reg(0x0208, 0x01);
ps_write_reg(0x0096, 0x00);
ps_write_reg(0x0097, 0xfd);
ps_write_reg(0x00e3, 0x00);
ps_write_reg(0x00e4, 0x04);
ps_write_reg(0x00e5, 0x02);
ps_write_reg(0x00e6, 0x01);
ps_write_reg(0x00e7, 0x03);
ps_write_reg(0x00f5, 0x02);
ps_write_reg(0x00d9, 0x05);
ps_write_reg(0x00db, 0xce);
ps_write_reg(0x00dc, 0x03);
ps_write_reg(0x00dd, 0xf8);
ps_write_reg(0x009f, 0x00);
ps_write_reg(0x00a3, 0x3c);
ps_write_reg(0x00b7, 0x00);
ps_write_reg(0x00bb, 0x3c);
ps_write_reg(0x00b2, 0x09);
ps_write_reg(0x00ca, 0x09);
ps_write_reg(0x0198, 0x01);
ps_write_reg(0x01b0, 0x17);
ps_write_reg(0x01ad, 0x00);
ps_write_reg(0x00ff, 0x05);
ps_write_reg(0x0100, 0x05);
ps_write_reg(0x0199, 0x05);
ps_write_reg(0x01a6, 0x1b);
ps_write_reg(0x01ac, 0x3e);
ps_write_reg(0x01a7, 0x1f);
ps_write_reg(0x0030, 0x00); |
as far as I can tell none of the registers are in the datasheet.
The routine, of which the above is part is called "init_proximity_sensor" so I guess it's initialisation, but why to unnamed registers? |
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temtronic
Joined: 01 Jul 2010
Posts: 9133
Location: Greensville,Ontario
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| Posted: Sun Feb 17, 2019 9:59 am |
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I'd contact the mfr of the VL6180 and get a proper datasheet for the device. I don't have that driver but I'll assume the device is a TOF ? Any 'init' routine would need to store KNOWN data into 'registers' for a device to operate in a known manner.
You might try 'googling' the device and one of the unnamed regstrs, see what comes up.
Contact the writer of the driver, as they know 'something' must be stored 'here' for the device to function... |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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temtronic
Joined: 01 Jul 2010
Posts: 9133
Location: Greensville,Ontario
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| Posted: Sun Feb 17, 2019 11:06 am |
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nice....so THE datasheet makes NO mention of the INIT needed to be done ! arrgh, sure glad PIC's datasheets aren't missing THAT kind of information!!!
Warning ! the device address 0x29 is the SEVEN bit address, so you'll need to 'fudge it' to be PIC I2C 8 bit compatible.
Running PCM P's I2C scanner program would be a great 1st start !
ALSO
it's a 3 volt device, best run at 2.7-2.9 VDD...
atleast THAT spec is in the datasheet !
Jay |
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towlerg
Joined: 04 Dec 2011
Posts: 4
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| Posted: Sun Feb 17, 2019 11:08 am |
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Thanks Temtronic and PCM programmer, I googled fairly hard but the app note eluded me. Perhaps I've lived a sheltered life, but I've never seen a device before that required an unexplained undocumented init code.
BTW I found the code in the drivers directory, it's part of the install.
Problem solved, it there a way to flag that against the thread? |
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