This is just test of ADC readout aproximation and display on ILI9341 color LCD display.
Top right (voltage) is using oproximation rounding method.
Same value on the left (and yellow) is direct readings of the ADC.
Current in right side is floating ADC, so random readings.
Very small text on red background is temperature readings from I2C sensors (LM75, FM75).
LCD screen SPI clock speed is reduced twice for debuging purposes, so final speed will be faster.
Software optimisations: we do no write data if the data is already on the screen.