Hi all,
I'm a little stumped as to how to write to a EEPot with the imw command.
The EEPot is a Maxim 5434 and has an address of 0x28. To write to its volatile or non-volatile register ... a command byte is given.
Writing 5 bits of data (it is a 32 tap pot so that is where the 5 bits come from) to move the wiper goes something like this:
Start, 0x28, Ack, Cmd byte, Ack, Data byte, Ack, Stop
Cmd byte is 0x11 to write to volatile reg. 0x21 to write to non-volatile reg.
The EEPROM really doesn't have addresses/offsets so I tried:
imw 28 11 80 1 imw.w 28 0.0 1180
... but it doesn't appear to play well with my device.
I'm in a bitbanged I2C environment (with GPIO) on a ARM9 core and I can write to RTC and EEPROM just fine.
So, will uboot I2C commands handle a device like this (address command data)?
I've been grepping code and searching this mail list and kernel drivers (lm-sensor's) and I can't find any examples of EEpots being used in u-boot or the Linux kernel.
Regards,
Brian