paul- wrote:
> Some use a user space program, but There is fan control in the
> kernel..... not sure if they use this or not?
This is the part to create the daemon for temperature checking (it is
running as a service later:
Code:
--------------------
echo 'def temp_check():' >> $powerbuttonscript
echo ' fanconfig = ["65=100", "60=55", "55=10"]' >> $powerbuttonscript
echo ' tmpconfig = load_config("'$daemonconfigfile'")' >>
$powerbuttonscript
echo ' if len(tmpconfig) > 0:' >> $powerbuttonscript
echo ' fanconfig = tmpconfig' >> $powerbuttonscript
echo ' address=0x1a' >> $powerbuttonscript
echo ' prevblock=0' >> $powerbuttonscript
echo ' while True:' >> $powerbuttonscript
echo ' temp = os.popen("vcgencmd measure_temp").readline()' >>
$powerbuttonscript
echo ' temp = temp.replace("temp=","")' >> $powerbuttonscript
echo ' val = float(temp.replace("'"'"'C",""))' >>
$powerbuttonscript
echo ' block = get_fanspeed(val, fanconfig)' >>
$powerbuttonscript
echo ' if block < prevblock:' >> $powerbuttonscript
echo ' time.sleep(30)' >> $powerbuttonscript
echo ' prevblock = block' >> $powerbuttonscript
echo ' try:' >> $powerbuttonscript
echo ' bus.write_byte(address,block)' >>
$powerbuttonscript
echo ' except IOError:' >> $powerbuttonscript
echo ' temp=""' >> $powerbuttonscript
echo ' time.sleep(30)' >> $powerbuttonscript
--------------------
They are reading the temperature with "vcgencmd measure_temp" and if it
reaches the next step from the config they call this:
Code:
--------------------
bus.write_byte(address,block)
--------------------
where address is 0x1a and block is the fanspeed from config.
I don't know what this bus.write_byte is doing. Maybe it is enough to
write this a single time to have the fan running always at the same
speed?
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