hi,
i want to use the i2c-pport driver to control some pcf8574. i have wired
the pcf8574 to the parallel-port and connected 8 leds to the pcf8574 to
show the status of the 8 bit outports. i have loaded the following
modules:
debian:/home/olli# lsmod
Module Size Used by Not tainted
rtc 5916 0 (unused)
i2c-proc 6016 0 (unused)
i2c-dev 3776 0
i2c-pport 1440 0
i2c-algo-bit 7880 0 [i2c-pport]
i2c-core 14464 0 [i2c-proc i2c-dev i2c-algo-bit]
eepro100 18572 1 (autoclean)
mii 2288 0 (autoclean) [eepro100]
dmesg gives me the following:
i2c-core.o: i2c core module version 2.8.0 (20030714)
i2c-pport.o: i2c
Primitive parallel port adapter module version 2.8.0
(20030714)
i2c-pport.o: found device at 0x378.
i2c-dev.o: Registered 'Primitive Parallel port adaptor' as minor 0
when i make a:
strace i2cset 0 0x20 0x0 1
i get the following:
nanosleep({5, 0}, {5, 0}) = 0
ioctl(3, 0x720, 0xbffffcf0) = -1 EPERM (Operation not
permitted)
write(2, "Warning - write failed\n", 23Warning - write failed
) = 23
ioctl(3, 0x720, 0xbffffcf0) = -1 EPERM (Operation not
permitted)
write(2, "Warning - readback failed\n", 26Warning - readback failed
) = 26
debian:/home/olli# cat /dev/i2c-0
cat: /dev/i2c-0: Remote I/O error
it seems that there is a i/o problem.
debian:/home/olli# cat /proc/bus/i2c
i2c-0 i2c Primitive Parallel port adaptor Bit-shift
algorithm
debian:/home/olli# cat /proc/bus/i2c-0
debian:/home/olli#
debian:/proc/sys/dev/sensors# ls -la
total 0
dr-xr-xr-x 2 root root 0 Aug 10 19:15 .
dr-xr-xr-x 5 root root 0 Aug 10 19:15 ..
-rw-r--r-- 1 root root 0 Aug 10 19:15 chips
debian:/proc/sys/dev/sensors# cat chips
debian:/proc/sys/dev/sensors#
an i2cdump 0 0x20 does not get any values from the chip.
do you have any idea why i can not get a connection to the chip?
thank
oliver joa
--
Dipl. Inf. (FH) Oliver Joa, senior IT-architect
Gatrixx NetSolutions GmbH, Karl-Goetz-Strasse 5, 97424 Schweinfurt
Fon +49 9721 797 420, Fax +49 9383 999-58, Mobil +49 160 47874 62
E-Mail ojoa at gatrixx.com, ojoa at gmx.net, oliver at j-o-a.de
http://www.finanztreff.de/
