[Gta04-owner] HDQ can't detect battery presence?

Dr. H. Nikolaus Schaller hns at goldelico.com
Wed Jan 30 16:35:00 CET 2013


Quesion to the protocol specialists:

I have discovered that the bq27000 driver always reports values. If the battery is removed while powering through USB there are timeouts and garbage values:

/sys/devices/w1_bus_master1/01-000000000000/bq27000-battery/power_supply/bq27000-battery# cat present type technology capacity voltage_now
1
Battery
Li-ion
cat: capacity: No data available
65535000
/sys/devices/w1_bus_master1/01-000000000000/bq27000-battery/power_supply/bq27000-battery#

Since I am not familiar with hdq/1-wire protocol I wonder why
the value "present" is always "1".

Isn't there some checksum or communication link presence detection?

Nikolaus



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