From your project schematic, the circuit could achieve "Vout=2*Vin".
Could you tell us the actual test result in your test platform?
You can start the Opamp_1 instance by calling Opamp_1_Start() you don't need to call Opamp_1_Init()
As well as the Opamp_1, you also don't need to call ADC_Init()
ADC_Start() is enough.