32-bit algorithm variables can be output in real time from the MCU through the DAC. DAC output is enabled by setting DAC_EN = 1. The DAC in MSPM0 is 12 bit, thus a scaling needs to be applied before output. User has two ways to scale the variable before output.

• For variables in global IQ format(IQ27):

  DAC_OUTPUT_VOLTAGE = (VARIABLE_VALUE × DAC_SCALING_FACTOR + 1) × 1.65V

  In the above equation setting the DAC_SCALING_FACTOR to 1 enables user to represent a data of IQ(1.0) to IQ(-1.0) in between 0V and 3.3V. To represent the data exceeding the value 1.0 use higher DAC_SCALING_FACTOR.

  For Example: To represent a data from -2.0 to +2.0 , set the DAC_SCALING_FACTOR to 0.5.

• For variables in other IQ format:

  For output of any other IQ, user can left shift or right shift the variable to bring the data in a 12-bit range before output. This mode is selected by setting DAC_SCALING_FACTOR to 0.

  If variable value is less than a 12-bit value, set DAC_SCALE to positive, the DAC output follows as below:

  DAC_OUTPUT_VOLTAGE = (VARIABLE_VALUE << DAC_SCALE) × 3.3V

  If variable value is greater than a 12-bit value, set DAC_SCALE to negative, the DAC output follows as below

  DAC_OUTPUT_VOLTAGE = (VARIABLE_VALUE >> DAC_SCALE) × 3.3V

  Note: Settings DAC_EN = 1 feeds the variable output to the DAC registers, but user needs to enable the DAC peripheral in TI SysConfig for the DAC peripheral to function. Also make sure the DAC output pin is not loaded by any other peripheral.