Dobrica Pavlinušić's random unstructured stuff

INA3221: Revision 4

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^ all grounds tied together, single input voltage

I have two versions of this modules purple and black, and they seem to have same problem:

* http://goingbacktoelectronic.blogspot.com/2017/09/ina3221-weird-wiring.html
* http://goingbacktoelectronic.blogspot.com/2017/09/fixing-ina3221.html

Alternative source with better pictures of modifications for multi-voltage support:

* https://kacitran.blogspot.com/2018/10/ina-3221.html

^ Linux setup

.pre
root@cubieboard:/home/dpavlin# modinfo ina3221
filename: /lib/modules/4.19.25-sunxi/kernel/drivers/hwmon/ina3221.ko
license: GPL v2
description: Texas Instruments INA3221 HWMon Driver
author: Andrew F. Davis <afd@ti.com>
alias: of:N*T*Cti,ina3221C*
alias: of:N*T*Cti,ina3221
alias: i2c:ina3221
depends:
intree: Y
name: ina3221
vermagic: 4.19.25-sunxi SMP mod_unload ARMv7 thumb2 p2v8

root@cubieboard:/home/dpavlin# i2cdetect -y 2
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: 40 -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

root@cubieboard:/home/dpavlin# echo ina3221 0x40 > /sys/bus/i2c/devices/i2c-2/new_device
[Sun May 12 14:23:20 2019] i2c i2c-2: new_device: Instantiated device ina3221 at 0x40

root@cubieboard:/home/dpavlin# sensors
pcf8591-i2c-2-48
Adapter: mv64xxx_i2c adapter
in0: +2.13 V
in1: +2.55 V
in2: +0.01 V
in3: +1.32 V

ina3221-i2c-2-40
Adapter: mv64xxx_i2c adapter
in1: +0.02 V
in2: +0.02 V
in3: +0.02 V
in4: +0.00 V
in5: +0.00 V
in6: +0.00 V
curr1: +0.00 A (max = +16.38 A, crit max = +16.38 A)
curr2: +0.00 A (max = +16.38 A, crit max = +16.38 A)
curr3: +0.00 A (max = +16.38 A, crit max = +16.38 A)

# setup correct resistors:

root@cubieboard:/home/dpavlin# grep -A 2 ina3221 /etc/rc.local
echo ina3221 0x40 > /sys/bus/i2c/devices/i2c-2/new_device
sleep 1
ls /sys/devices/platform/soc/*.i2c/i2c-2/2-0040/hwmon/hwmon1/shunt*_resistor | xargs -i sh -cx 'echo 100000 > {}'


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