I am just starting with the FR4133 Launchpad. I want to read an external voltage on A8 (P8.0) using driverlib. I get 0 as the return value (ADCvalue) from the getResults call . Code:
uint16_t ADCvalue;
// Configure A to D
GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P8, GPIO_PIN0, GPIO_TERNARY_MODULE_FUNCTION);
ADC_init (ADC_BASE, ADC_SAMPLEHOLDSOURCE_SC, ADC_CLOCKSOURCE_ADCOSC, ADC_CLOCKDIVIDER_1);
ADC_enable(ADC_BASE);
ADC_setupSamplingTimer(ADC_BASE,ADC_CYCLEHOLD_8_CYCLES,ADC_MULTIPLESAMPLESDISABLE);
ADC_configureMemory(ADC_BASE, ADC_INPUT_A8, ADC_VREFPOS_AVCC, ADC_VREFNEG_AVSS);
while (1)
{
ADC_startConversion (ADC_BASE, ADC_SINGLECHANNEL);
while (!(ADC_getInterruptStatus(ADC_BASE,ADC_COMPLETED_INTERRUPT_FLAG))) ;
ADCvalue = ADC_getResults(ADC_BASE);
ADC_clearInterrupt(ADC_BASE, ADC_COMPLETED_INTERRUPT_FLAG);
}
}
Any idea why this is not returning results?