int main(void)
{
/* Disable JTAG to free up PORTA pins */
DDPCONbits.JTAGEN = 0;
/* Set lower 8 bits of PORTA as output for LEDs, clear the bits to ensure
there is no mismatch when they are toggled */
PLIB_PORTS_DirectionOutputSet(PORTS_ID_0, PORT_CHANNEL_A, (PORTS_DATA_MASK)0x00FF);
PLIB_PORTS_Clear(PORTS_ID_0, PORT_CHANNEL_A, (PORTS_DATA_MASK)0x00FF);
/* Set pin AN2 as analog input */
PLIB_PORTS_PinModeSelect(PORTS_ID_0, PORTS_ANALOG_PIN_2, PORTS_PIN_MODE_ANALOG);
/* ADC setup - ouput in integer format, trigger mode auto, enable autosample */
PLIB_ADC_ResultFormatSelect(ADC_ID_1, ADC_RESULT_FORMAT_INTEGER_16BIT);
PLIB_ADC_SamplingModeSelect(ADC_ID_1, ADC_SAMPLING_MODE_MUXA);
PLIB_ADC_ConversionTriggerSourceSelect(ADC_ID_1, ADC_CONVERSION_TRIGGER_INTERNAL_COUNT);
PLIB_ADC_VoltageReferenceSelect(ADC_ID_1, ADC_REFERENCE_VDD_TO_AVSS );
PLIB_ADC_SampleAcqusitionTimeSet(ADC_ID_1, 0x1F);
PLIB_ADC_ConversionClockSet(ADC_ID_1, SYS_FREQUENCY, 32);
/* Connect AN2 as positive input, Vref- as negative input */
PLIB_ADC_MuxChannel0InputPositiveSelect(ADC_ID_1, ADC_MUX_A, ADC_INPUT_POSITIVE_AN2);
PLIB_ADC_MuxChannel0InputNegativeSelect(ADC_ID_1, ADC_MUX_A, ADC_INPUT_NEGATIVE_VREF_MINUS);
/* Enable the ADC module */
PLIB_ADC_Enable(ADC_ID_1);
int potValue;
int i;
int ledMask;
/* Stuck in this loop, reading the potentiometer and writing to the LEDs */
while (1)
{
potValue = readPotentiometer();
potValue = potValue >> 7; /* 10-bit value to 3-bit value */
ledMask = 0;
/* Creates a mask for the LEDs, corresponding to the value read from
the potentiometer */
for (i = 0; i <= potValue; i++)
{
ledMask |= 1<<(i);
}
/* Write the mask to the LEDs */
PLIB_PORTS_Write(PORTS_ID_0, PORT_CHANNEL_A, (PORTS_DATA_MASK)ledMask);
}
/* Program should not go here during normal operation */
return EXIT_FAILURE;
}
// *****************************************************************************
// *****************************************************************************
// Section: ADC Static Driver Functions
// *****************************************************************************
// *****************************************************************************
void DRV_ADC_Initialize(void)
{
/* Select Clock Source */
PLIB_ADC_ConversionClockSourceSelect(DRV_ADC_ID_1, ADC_CLOCK_SOURCE_SYSTEM_CLOCK);
/* Select Clock Prescaler */
PLIB_ADC_ConversionClockSet(DRV_ADC_ID_1, SYS_CLK_FREQ, 320000000);
/* Select Power Mode */
PLIB_ADC_StopInIdleDisable(DRV_ADC_ID_1);
/* Select Voltage Reference */
PLIB_ADC_VoltageReferenceSelect(DRV_ADC_ID_1, ADC_REFERENCE_VDD_TO_AVSS);
/* Sampling Selections */
/* Select Sampling Mode */
PLIB_ADC_SamplingModeSelect(DRV_ADC_ID_1, ADC_SAMPLING_MODE_MUXA);
/* Number of Samples Per Interrupt */
PLIB_ADC_SamplesPerInterruptSelect(DRV_ADC_ID_1, ADC_2SAMPLES_PER_INTERRUPT);
/* Conversion Selections */
/* Select Trigger Source */
PLIB_ADC_ConversionTriggerSourceSelect(DRV_ADC_ID_1, ADC_CONVERSION_TRIGGER_INTERNAL_COUNT);
/* Select Result Format */
PLIB_ADC_ResultFormatSelect(DRV_ADC_ID_1, ADC_RESULT_FORMAT_INTEGER_16BIT);
/* Buffer Mode */
PLIB_ADC_ResultBufferModeSelect(DRV_ADC_ID_1, ADC_BUFFER_MODE_ONE_16WORD_BUFFER);
/* Channel Selections */
/* MUX A Negative Input Select */
PLIB_ADC_MuxChannel0InputNegativeSelect(DRV_ADC_ID_1, ADC_MUX_A, ADC_INPUT_NEGATIVE_VREF_MINUS);
/* MUX A Positive Input Select */
PLIB_ADC_MuxChannel0InputPositiveSelect(DRV_ADC_ID_1, ADC_MUX_A, ADC_INPUT_POSITIVE_AN0);
/* Initialize ADC Interrupt */
PLIB_INT_SourceFlagClear(INT_ID_0, INT_SOURCE_ADC_1);
PLIB_INT_SourceEnable(INT_ID_0, INT_SOURCE_ADC_1);
PLIB_INT_VectorPrioritySet(INT_ID_0, INT_VECTOR_AD1, INT_PRIORITY_LEVEL1);
PLIB_INT_VectorSubPrioritySet(INT_ID_0, INT_VECTOR_AD1, INT_SUBPRIORITY_LEVEL0);
}
