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List:       openbsd-arm
Subject:    i2c - gpioiic driver
From:       "Stephen Graf" <s_graf () telus ! net>
Date:       2017-09-07 15:10:37
Message-ID: 001c01d327eb$7786ff10$6694fd30$ () telus ! net
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I have set up i2c bit banging (bashing) on my Orange Pi one - not without
difficulty,  There are three issues I would like to explore:
- existing drivers, gpioiic
- nanosleep
- input/output on same gpio pin

Gpioiic driver

Is this driver working?  I tried to set it up in rc.securelevel:

echo "Set up i2c"
/usr/sbin/gpioctl /dev/gpio0 attach gpioiic 11 0x03

With the following results:

Set up i2c
gpioiic0 at gpio0: SDA[11], SCL[12]
iic0 at gpioiic0

However there is no /dev/gpioiic even after I try to make it:

# cd /dev
# ./MAKEDEV gpioiic0
# ./MAKEDEV gpioiic

# ls -al /dev/g*
crw-------  1 root  wheel   13,   0 Sep  2 11:11 /dev/gpio0
crw-------  1 root  wheel   13,   1 Aug 30 22:53 /dev/gpio1
crw-------  1 root  wheel   13,   2 Aug 30 22:53 /dev/gpio2
crw-------  1 root  wheel   13,   3 Aug 30 22:53 /dev/gpio3
crw-------  1 root  wheel   13,   4 Aug 30 22:53 /dev/gpio4
crw-------  1 root  wheel   13,   5 Aug 30 22:53 /dev/gpio5
crw-------  1 root  wheel   13,   6 Aug 30 22:53 /dev/gpio6
crw-------  1 root  wheel   13,   7 Aug 30 22:53 /dev/gpio7
crw-------  1 root  wheel   13,   8 Aug 30 22:53 /dev/gpio8

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