I'd like to test an ADC conversion using ADC example from STM32F3Discovery's peripheral examples.
I connected ADC1 channel(PC1) and GND to external power supply directly. and It was measured a normal voltage between PC1 and GND using FLUKE Multimeter 8846A.
But, as attached the ADC value on Terminal I/O, the results are very unstable. Is that due to the bad connection for ADC input source? or I cannot catch the problem exactly. Could you please help the issue?
1. supplying 0V to ADC1 channel(PC1)
2. supplying 1.0V to ADC1 channel(PC1)