BSP and Device Driver Development Guide
This corresponds to the driver write call. After validating the minor number and arguments, this call writes the indicated device. If the specified device is an ADC, then an error is usually returned.
The value written is a single precision floating point number
representing the voltage to be written to the specified DAC.
This value is stored in the argument_block passed in to the
call. By passing the voltage to the device driver, the caller is
freed from having to know the number of bits in the analog
and board dependent conversion algorithm.
BSP and Device Driver Development Guide
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