I generated an output waveform on a DAC pin and read it on ADC pin but the values which ADC showed weren't changing in steps(as designed). DAC signal on oscilloscope showed a lot of noise and hence the requirement for external supply.
Tried using a phone charger(plugged in mini usb), took off jumpers on CN3 and shorted VDD to NRST, the board powers but the clock is ridiculously slow. Also later an external 5V supply in to 5V out pin, didn't work.
Any clue how should I go about or any available documentation for this thing?