IIC support?
Krassimir Slavchev
krassi at bulinfo.net
Mon Mar 5 14:17:17 UTC 2007
Warner Losh wrote:
>> I have problems to access the iic eeprom from userland. Even after set
>> SCAN_IICBUS in iicbus.c nothing has been detected. I have made some
>> tests from the bootloader to read/write from/to the eeprom and they work.
>> Is there any known problems with TWI or any differences between board
>> settings?
>>
>
> The IIC bus is not a self enumerating bus. Bad things happen when you
> go out and try to 'probe' it, although often you can get away with
> that. FreeBSD takes a conservative approach. You need hints for each
> iic device on bus that you have on your board.
>
>
Ok, that was just for testing.
I am trying to write a driver for pcf8563 (RTC similar to ds1672) but
when I call the iicbus_transfer() function the iicbus_transfer_gen() is
called instead of at91_twi_transfer().
In the kernel config file I have:
...
device at91_twi
device iicbus
...
Is this correct or I miss something else?
> Warner
>
>
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