HI @
Which your Microcontroller ? Do you have 'Tiva C Series LaunchPad ( EK-TM4C123GXL) ?
if you have 'Tiva C Series LaunchPad', you can connect pin 'PE3'
GPIO_PORTC_BASE ==> GPIO_PORTE_BASE
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE); GPIOPinTypeADC(GPIO_PORTE_BASE,GPIO_PIN_3); ADCSequenceConfigure(ADC0_BASE, 3, ADC_TRIGGER_PROCESSOR, 0); ADCSequenceStepConfigure(ADC0_BASE, 3, 0, ADC_CTL_CH0 | ADC_CTL_IE |ADC_CTL_END);