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;
}
//runs once
void SENSOR_Initialize ( void )
{
sensorData.sendCount = 0;
//Initialize task variables
sensorData.state = SENSOR_STATE_INIT;
//Create a queue capable of holding 25 unsigned long numbers
sensorData.q_adc_interrupt = xQueueCreate( 2500, sizeof( unsigned int ) );
if( sensorData.q_adc_interrupt == 0 ) {
dbgOutputVal(SENSOR_QUEUE_FAIL);
stopAll();
}
//Create a timer with rollover rate 100ms
sensorData.t_adc_interrupt = xTimerCreate(
"SensorTimer", //Just a text name
( LR_SENSOR_TIMER_RATE / portTICK_PERIOD_MS ), //period is 100ms
pdTRUE, //auto-reload when expires
(void *) 29, //a unique id
sensorTimerCallback ); //pointer to callback function
//Start the timer
if( sensorData.t_adc_interrupt == NULL ) {
dbgOutputVal(SENSOR_TIMERINIT_FAIL);
stopAll();
}
else if( xTimerStart( sensorData.t_adc_interrupt, 0 ) != pdPASS ) {
dbgOutputVal(SENSOR_TIMERINIT_FAIL);
stopAll();
}
//Initialize ADC A0 = Pic32 pin 25, RB0. Manual Sample Start and TAD based Conversion Start
PLIB_PORTS_PinDirectionInputSet(PORTS_ID_0, PORT_CHANNEL_B, PORTS_BIT_POS_0);
PLIB_ADC_SampleAutoStartDisable(ADC_ID_1);
PLIB_ADC_Enable(ADC_ID_1);
}
inline void DRV_ADC_Open(void)
{
/* Enable ADC */
PLIB_ADC_Enable(DRV_ADC_ID_1);
}
