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DAC Synchronous driver
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A DAC (Digital-to-Analog Converter) converts digital value to an analog voltage.
The digital value from 0 to the highest represent the output voltage value.
The digital highest value possible with the bit resolution supported by the
DAC. For example a 10 bit resolution DAC hardware, the highest value is 1024.
The highest output voltage possible with the reference voltage.

The driver can convert a serials digital value. The pre-defined data should
be an data array. Application can invoke dac_sync_write to start the conversation.

Features
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* Initialization and de-initialization
* Enabling and disabling
* Support for DACs with channels
* Writing buffers with multiple samples to DAC

Applications
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* Generate audio signals by connecting the DAC output to a speaker
* Generate a reference voltage

Dependencies
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* DAC hardware

Concurrency
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N/A

Limitations
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N/A

Knows issues and workarounds
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N/A