DAC buffering

[kimstik]

I found that output is sensitive to R4/R9 values.
In my case with 20k of R4 it drops voltage 30% down.
Seems that DAC output buffer is not enabled.

[mzhboy]

yes, dac buffer is disabled

https://github.com/free-pdk/easy-pdk-programmer-software/blob/cdc40ae65f85c1ed93f304f5008c6b9b6c5c0043/Firmware/source/Src/stm32f0xx_hal_msp.c#L162-L186

https://github.com/free-pdk/easy-pdk-programmer-software/blob/cdc40ae65f85c1ed93f304f5008c6b9b6c5c0043/Firmware/source/Src/main.c#L260-L294

[cpldcpu]

@freepdk Was it a conscious design decision to not enable the DAC buffer?