How 3x axis sine waves act on a Compass module Oshonsoft BASIC.

jjw · Sep 25, 2020

Sorry, I haven't read the whole d/s.
I2C is disabled with a pin in the chip.

camerart · Sep 26, 2020

jjw said:
Sorry, I haven't read the whole d/s.
I2C is disabled with a pin in the chip.

Hi J,
i2c Here:

I think I'll swap the chip set-up back to in front of the 'self test' routine, and hope I can keep the relevant settings, without the 'self test' routine changing them.
C

jjw · Sep 26, 2020

From the D/S
AK8963 supports I2C bus interface and 4-wire SPI. A selection is made by CSB pin.
CSB pin=“L”: 4-wire SPI
CSB pin=“H”: I2C bus interface

camerart · Sep 26, 2020

jjw said:
From the D/S
AK8963 supports I2C bus interface and 4-wire SPI. A selection is made by CSB pin.
CSB pin=“L”: 4-wire SPI
CSB pin=“H”: I2C bus interface

Hi J,
It appears that I've been using 2x ways of disabling i2c!
1/The method in #62
plus
2/ Each time I WRITE or READ the chip, I use this method:
______________________________________________________________________
SPI COMPSS = CSB H or L

compss = 0 'CHIP SELECT COMPASS ON
SPISend 0x0f 'CONFIG I2C Disable
SPISend 0x1b '1B=27 WRITE CONFIG I2C OFF
compss = 1 'CHIP SELECT COMPASS OFF
_____________________________________________________________________________
Thanks
C.

jjw · Sep 26, 2020

Don't you have CSB pin low permanently ( tied to GND )?

camerart · Sep 26, 2020

jjw said:
Don't you have CSB pin low permanently ( tied to GND )?

Hi J,
No, I thought that each module was selected in turn by it's chip select pin.
C

camerart · Sep 26, 2020

Hi J,
The program has stopped getting the normal READings, so I think it's better that I start again, with what I've learnt, but this time without the normal READ of measurement.
C

jjw · Sep 26, 2020

O

camerart said:
Hi J,
No, I thought that each module was selected in turn by it's chip select pin.
C

Of course, my bad.
Then you don't have to disable I2C in software.

jjw · Sep 26, 2020

Is the chip select pin separate from the CSB pin?

camerart · Sep 26, 2020

jjw said:
Is the chip select pin separate from the CSB pin?

Hi J,
No there's only one.
C

camerart · Sep 26, 2020

Hi J,
I've been re-writing the 'self test' program, item by item, and got to the offending ASTC WRITE READ here are the results.
As you can see the ASTC shows 64 which is 0x40 as WRITTEN.
Good, I'll stop for now.
C.
________________________________________________________
[00][00]Ready!
AT+C002
CNTL2 0.00
i2cDIS 27.00
CNTL2 22.00
CNTL1 16.00
ASTC 64.00

camerart · Sep 26, 2020

Hi J,
Does this look ok?
Note SELF TEST and NORMAL RUNNING
C.
__________________________________________________
[00]Ready!
AT+C002
SELF TEST
CNTL1 22.00
ASTC 64.00
CNTL1 24.00
WIA 72 ST2 16 CNTL1 22 ASTC 0 I2C 27
-85.00, 67.00, -111.00
ASTC 0.00
CNTL1 16.00
CNTL2 0.00
i2cDIS 27.00
CNTL2 22.00
NORMAL RUNNING
-86.00,68.00,-114.00
-84.00,68.00,-106.00
-83.00,69.00,-103.00
-88.00,68.00,-110.00
-85.00,75.00,-107.00
-94.00,72.00,-108.00
-82.00,74.00,-114.00
-75.00,65.00,-109.00
-85.00,65.00,-105.00
-82.00,72.00,-110.00
-83.00,71.00,-111.00
-88.00,68.00,-108.00
-67.00,79.00,-109.00
-52.00,88.00,-112.00
-29.00,103.00,-103.00
-19.00,109.00,-115.00
-31.00,107.00,-119.00
-4.00,102.00,-114.00
18.00,108.00,-106.00
31.00,109.00,-107.00
54.00,102.00,-100.00
69.00,103.00,-113.00
73.00,93.00,-111.00
92.00,80.00,-112.00
97.00,73.00,-107.00
94.00,66.00,-116.00
95.00,57.00,-113.00
95.00,57.00,-113.00
103.00,59.00,-109.00
104.00,56.00,-114.00
109.00,57.00,-111.00
112.00,52.00,-110.00
93.00,65.00,-107.00

jjw · Sep 26, 2020

Z values in self test should be -3200 to -800 ( 16bit mode)

camerart · Sep 26, 2020

jjw said:
Z values in self test should be -3200 to -800 ( 16bit mode)

Hi J,
I'm a bit suspicious that 3x different modules, READ the same?
C

jjw · Sep 26, 2020

camerart said:
Hi J,
I'm a bit suspicious that 3x different modules, READ the same?
C

What do you mean?

jjw · Sep 26, 2020

camerart said:
Hi J,
Does this look ok?
Note SELF TEST and NORMAL RUNNING
C.
__________________________________________________
[00]Ready!
AT+C002
SELF TEST
CNTL1 22.00
ASTC 64.00
CNTL1 24.00
WIA 72 ST2 16 CNTL1 22 ASTC 0 I2C 27
-85.00, 67.00, -111.00
ASTC 0.00
CNTL1 16.00
CNTL2 0.00
i2cDIS 27.00
CNTL2 22.00
NORMAL RUNNING
-86.00,68.00,-114.00
-84.00,68.00,-106.00
-83.00,69.00,-103.00
-88.00,68.00,-110.00
-85.00,75.00,-107.00
-94.00,72.00,-108.00
-82.00,74.00,-114.00
-75.00,65.00,-109.00
-85.00,65.00,-105.00
-82.00,72.00,-110.00
-83.00,71.00,-111.00
-88.00,68.00,-108.00
-67.00,79.00,-109.00
-52.00,88.00,-112.00
-29.00,103.00,-103.00
-19.00,109.00,-115.00
-31.00,107.00,-119.00
-4.00,102.00,-114.00
18.00,108.00,-106.00
31.00,109.00,-107.00
54.00,102.00,-100.00
69.00,103.00,-113.00
73.00,93.00,-111.00
92.00,80.00,-112.00
97.00,73.00,-107.00
94.00,66.00,-116.00
95.00,57.00,-113.00
95.00,57.00,-113.00
103.00,59.00,-109.00
104.00,56.00,-114.00
109.00,57.00,-111.00
112.00,52.00,-110.00
93.00,65.00,-107.00

While drdy = 0
SPISend 0x82
SPIReceive drdy
<------------- Wend should be here, not at the end of the loop

camerart · Sep 26, 2020

jjw said:
While drdy = 0
SPISend 0x82
SPIReceive drdy
<------------- Wend should be here, not at the end of the loop

Hi J,
Ok, thanks.
C.

camerart · Sep 26, 2020

jjw said:
What do you mean?

Hi J,
I used the program, you've seen with 3x diferent compasses (modules) and the results were the same, I found this suspicious.

I tried a different method of READing the 'self test' measurement DATA, (simply a READ for each sensor). This resulted in different READings, but I still don't think they look correct, also all of them are out of the correct 'self test' values
I'll keep changing, till it looks better, then post the program.
C

camerart · Sep 27, 2020

Hi J,
Success!!
I found a major typo, XXX instead of XYZ, changed and now it works. Similar results with 3x modules.
Thanks, C

camerart · Sep 27, 2020

Hi,
I've just been reminding myself about the Magmaster and Magviewer.
Magmaster is for producing correction settings for each Compass module, and Magviewer is to show how far out it is before and after.
Here is 1x Module in Magviewer:

Previouslt we made a READing average program, which I've got to combine into the 'Self test'/Magmaster program.
C

How 3x axis sine waves act on a Compass module Oshonsoft BASIC.

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