STM32F DAC, Digital POT, MCP4251, MCP4716
from: https://eroro.tistory.com/582 [crayon-695f64fbc3214726900196/] [crayon-695f64fbc3231855873415/] -------------------------------------------------------------------------------------------------------------------- [crayon-695f64fbc323c050927571/] [crayon-695f64fbc3248221439807/]