int mdaq_ain_init( uint8_t adc )
{
int result;
#if 0 /* TODO: detect hardware */
int detected_adc = get_adc_type();
if ( detected_adc =! adc)
return -1;
#endif
config_adc( &mdaq_adc, adc );
result = mdaq_adc.init();
if ( result < 0 )
return -1;
return 0;
}
int main() {
uint32_t adcInputBuffer[SAMPLE_BUFFER_LENGTH];
memset(adcInputBuffer, 0, sizeof(adcInputBuffer));
// We use the ADC irq to trigger DMA and the manual says
// that in this case the NVIC for ADC must be disabled.
NVIC_DisableIRQ(ADC_IRQn);
// Power up the ADC and set PCLK
LPC_SC->PCONP |= (1UL << 12);
LPC_SC->PCLKSEL0 &= ~(3UL << 24); // PCLK = CCLK/4 96M/4 = 24MHz
// Enable the ADC, 12MHz, ADC0.0 & .1
LPC_ADC->ADCR = (1UL << 21) | (1UL << 8) | (1UL << 0);
/*
* Every time the program loops the ADC pins are zeroed out
* but depending on the rotation only 1 pin is active for sampling
* MAY HAVE TO ADD ALOT MORE INSIDE THIS CONTROL STRUCTURE
*/
LPC_PINCON->PINSEL1 &= ~(3UL << 14); /* P0.23, Mbed p15. */
LPC_PINCON->PINSEL1 &= ~(3UL << 16); /* P0.24, Mbed p16. */
switch (control_ticker){
case true:LPC_PINCON->PINSEL1 |= (1UL << 14); break;
case false:LPC_PINCON->PINSEL1 |= (1UL << 16); break;
}
// Open up output file for debugging
FILE *log = fopen("/local/log.txt","w");
fprintf(log,"ADC with DMA example\n");
fprintf(log,"====================\n");
//Configuration for DMA
config_adc();
//Burst Mode Configuration Stuffz
switch (control_ticker){
case true:LPC_ADC->ADCR |= (1UL << 16); break;
case false:LPC_ADC->ADCR |= (2UL << 16); break;
}
// When transfer complete do this block.
if (dmaTransferComplete) {
delete conf; // No memory leaks, delete the configuration.
dmaTransferComplete = false;
//RAW DATA PRINTING BLOCK
for (int i = 0; i < SAMPLE_BUFFER_LENGTH; i++) {
int channel = (adcInputBuffer[i] >> 24) & 0x7;
int iVal = (adcInputBuffer[i] >> 4) & 0xFFF;
double fVal = 3.3 * (double)((double)iVal) / ((double)0x1000); // scale to 0v to 3.3v
fprintf(log,"Array index %02d : ADC input channel %d = 0x%03x %01.3f volts\n", i, channel, iVal, fVal);
}
//Starting off the Peak Detector Sequence
//Slope Bool holds the current state of the slope on the wave
//PeakBuf holds the indices of the peaks
//PeakTicker is the counter for PeakBuf
fprintf(log, "Peak Detection Starting");
slope = cal_slope(adcInputBuffer[2], adcInputBuffer[1]);
fprintf(log, "Slope starts %s", slope);
int PeakBuf[10];
memset(PeakBuf, 0, sizeof(PeakBuf));
int diffBuff[9];
memset(diffBuff, 0, sizeof(PeakBuf));
int PeakTicker = 0;
double sum =0;
for(int i = 1; i < SAMPLE_BUFFER_LENGTH - 1; i++){
fprintf(log, "Slope is %s @ index %d\n", slope,i);
switch(cal_slope(adcInputBuffer[i], adcInputBuffer[i-1])){
case 1:
if (slope == false){ // This is the condition in which you have found a Peak
PeakBuf[PeakTicker] = i - 1; //Detects Peak After it has passed
PeakTicker++; //Increment index of PeakBuf
fprintf(log, "There is a peak @ index %d\n",i);
}
break;
default:
break;
}
if (PeakTicker == 10) break; //Once the Peak Buffer is full quit
}
for (int i = 1; i ; i++){
diffBuff[i] = PeakBuf[i] + PeakBuf[i+1];
}
for (int i = 0; i < sizeof(PeakBuf); i++){
sum += diffBuff[i];
}
int mean = 200000/sum;
fprintf(log,"The estimated frequency is %d\n", (int)mean);
fclose(log);
// Just flash LED1 for something to do.
led1 = !led1;
wait(0.25);
}
}
