/**
* @brief ADC initialization.
*
* Enables ADC and sets up the sequencer for single sample on the range
* finder ADC input.
*/
void adcInit(void) {
/* Setup ADC for 12-bit mode and normal power */
Chip_ADC_Init(LPC_ADC, 0);
/* Need to do a calibration after initialization and trim */
Chip_ADC_StartCalibration(LPC_ADC);
while (!(Chip_ADC_IsCalibrationDone(LPC_ADC))) {}
/* Setup for maximum ADC clock rate using sycnchronous clocking */
Chip_ADC_SetClockRate(LPC_ADC, 500000);
Chip_ADC_SetupSequencer(LPC_ADC, ADC_SEQA_IDX,
(ADC_SEQ_CTRL_CHANSEL(MoonLander_IO8_ADC) | ADC_SEQ_CTRL_MODE_EOS));
/* Setup threshold 0 low and high values to about 25% and 75% of max */
Chip_ADC_SetThrLowValue(LPC_ADC, 0, ((1 * 0xFFF) / 4));
Chip_ADC_SetThrHighValue(LPC_ADC, 0, ((3 * 0xFFF) / 4));
/* Clear all pending interrupts */
Chip_ADC_ClearFlags(LPC_ADC, Chip_ADC_GetFlags(LPC_ADC));
/* Enable ADC overrun and sequence A completion interrupts */
Chip_ADC_EnableInt(LPC_ADC, (ADC_INTEN_SEQA_ENABLE | ADC_INTEN_OVRRUN_ENABLE));
/* Use threshold 0 for ADC channel and enable threshold interrupt mode for
channel as crossing */
Chip_ADC_SelectTH0Channels(LPC_ADC, ADC_THRSEL_CHAN_SEL_THR1(MoonLander_IO8_ADC));
Chip_ADC_SetThresholdInt(LPC_ADC, MoonLander_IO8_ADC, ADC_INTEN_THCMP_CROSSING);
/* Enable ADC NVIC interrupt */
NVIC_EnableIRQ(ADC_SEQA_IRQn);
/* Enable sequencer */
Chip_ADC_EnableSequencer(LPC_ADC, ADC_SEQA_IDX);
}
void ADC_SEQA_IRQHandler(void)
{
uint32_t pending;
/* Get pending interrupts */
pending = Chip_ADC_GetFlags(LPC_ADC);
/* Sequence A completion interrupt */
if (pending & ADC_FLAGS_SEQA_INT_MASK) {
g_adc_sample_ready = 1;
}
/* Clear any pending interrupts */
Chip_ADC_ClearFlags(LPC_ADC, pending);
}
/**
* @brief Handle interrupt from ADC sequencer A
* @return Nothing
*/
void ADCA_IRQHandler(void)
{
uint32_t pending;
/* Get pending interrupts */
pending = Chip_ADC_GetFlags(LPC_ADC);
/* Sequence A completion interrupt */
if (pending & ADC_FLAGS_SEQA_INT_MASK) {
sequenceComplete = true;
}
/* Threshold crossing interrupt on channel 1? */
if (pending & ADC_FLAGS_THCMP_MASK(1)) {
thresholdCrossed = true;
}
/* Clear any pending interrupts */
Chip_ADC_ClearFlags(LPC_ADC, pending);
}
/**
* @brief main routine for ADC example
* @return Function should not exit
*/
int main(void)
{
uint32_t rawSample;
int j;
SystemCoreClockUpdate();
Board_Init();
DEBUGSTR("ADC Demo\r\n");
/* Setup ADC for 12-bit mode and normal power */
Chip_ADC_Init(LPC_ADC, 0);
/* Setup for maximum ADC clock rate */
Chip_ADC_SetClockRate(LPC_ADC, ADC_MAX_SAMPLE_RATE);
/* Setup sequencer A for ADC channel 1, EOS interrupt */
#if defined(BOARD_MCORE48_1125)
/* Setup a sequencer to do the following:
Perform ADC conversion of ADC channel 1 only
Trigger on low edge of PIO0_7 */
Chip_ADC_SetupSequencer(LPC_ADC, ADC_SEQA_IDX, (ADC_SEQ_CTRL_CHANSEL(1) |
ADC_SEQ_CTRL_MODE_EOS | ADC_SEQ_CTRL_HWTRIG_PIO0_7));
/* Select ADC_1 mux for PIO1_11 */
Chip_IOCON_PinMuxSet(LPC_IOCON, IOCON_PIO1_11, (IOCON_FUNC1 | IOCON_ADMODE_EN));
/* Setup GPIO PIO0_7 as an input (will kill LED out) */
Chip_GPIO_WriteDirBit(LPC_GPIO, 0, 7, false);
/* Use higher voltage trim for MCore48 board */
Chip_ADC_SetTrim(LPC_ADC, ADC_TRIM_VRANGE_HIGHV);
#endif
/* Need to do a calibration after initialization and trim */
Chip_ADC_StartCalibration(LPC_ADC);
while (!(Chip_ADC_IsCalibrationDone(LPC_ADC))) {}
/* Setup threshold 0 low and high values to about 25% and 75% of max */
Chip_ADC_SetThrLowValue(LPC_ADC, 0, ((1 * 0xFFF) / 4));
Chip_ADC_SetThrHighValue(LPC_ADC, 0, ((3 * 0xFFF) / 4));
/* Clear all pending interrupts */
Chip_ADC_ClearFlags(LPC_ADC, Chip_ADC_GetFlags(LPC_ADC));
/* Enable ADC overrun and sequence A completion interrupts */
Chip_ADC_EnableInt(LPC_ADC, (ADC_INTEN_SEQA_ENABLE | ADC_INTEN_OVRRUN_ENABLE));
/* Use threshold 0 for channel 1 and enable threshold interrupt mode for
channel as crossing */
Chip_ADC_SelectTH0Channels(LPC_ADC, ADC_THRSEL_CHAN_SEL_THR1(1));
Chip_ADC_SetThresholdInt(LPC_ADC, 1, ADC_INTEN_THCMP_CROSSING);
/* Enable ADC NVIC interrupt */
NVIC_EnableIRQ(ADC_A_IRQn);
/* Enable sequencer */
Chip_ADC_EnableSequencer(LPC_ADC, ADC_SEQA_IDX);
/* Setup SyTick for a periodic rate */
SysTick_Config(SystemCoreClock / TICKRATE_HZ);
/* Endless loop */
while (1) {
/* Sleep until something happens */
__WFI();
if (thresholdCrossed) {
thresholdCrossed = false;
DEBUGSTR("********ADC threshold event********\r\n");
}
/* Is a conversion sequence complete? */
if (sequenceComplete) {
sequenceComplete = false;
/* Get raw sample data for channels 1-8 */
for (j = 1; j <= 1; j++) {
rawSample = Chip_ADC_GetDataReg(LPC_ADC, j);
/* Show some ADC data */
DEBUGOUT("Sample value = 0x%x\r\n", ADC_DR_RESULT(rawSample));
DEBUGOUT("Threshold range = 0x%x\r\n", ADC_DR_THCMPRANGE(rawSample));
DEBUGOUT("Threshold cross = 0x%x\r\n", ADC_DR_THCMPCROSS(rawSample));
DEBUGOUT("Overrun = %d\r\n", ((rawSample & ADC_DR_OVERRUN) != 0));
DEBUGOUT("Data valid = %d\r\n", ((rawSample & ADC_SEQ_GDAT_DATAVALID) != 0));
DEBUGSTR("\r\n");
}
}
}
/* Should not run to here */
return 0;
}
