The Max5821L DAC can be controlled from the user space by using the setDAC function. No special driver is needed except the i2c host one, which is statically built into the kernel.
Not needed on latest versions (> Armadeus 3.0): the tool is installed by default. Informations are kept here.
To set the DAC outputs to a given value, use the setDAC command:
# setDAC ##Usage: setDAC OUTPUT [VALUE] power down or set DAC output with value 0 - 1023 OUTPUT is A , B or AB (both) VALUE must be 0 - 1023 If no VALUE is given, then the output is powered down ##