wschrab / ME4231 Lab 3

/////////////////////////////////////////////////////////////////////////////////////////////// // SINEIO /////////////////////////////////////////////////////////////////////////////////////////////// #include <time.h> #include "../myWin826.h" #include "../826api.h" #include "../RealTime.h" #define SAMPLE_RATE 750 // SET ME // IO card configuration constants #define IO_BOARD_NUM 0 // no change #define ADC_SLOT 0 // no change #define DAC_ZERO_OUTPUT 0x8000 #define DAC_CONFIG_GAIN S826_DAC_SPAN_10_10 // -10 to 10 spans 20 volts so... #define DAC_VRANGE 20.0 // This MUST correspond to the DAC_SPAN just above #define DAC_CNT_RANGE 0xFFFF // 16-bit DAC #define DAC_OFFSET_COUNTS 0x8000 // 32768 offset for a signed desired output mapped to unsigned DAC write. #define DAC_CHANNEL 1 // SET ME! CHECK YOUR SETUP: DAC channel output #define ADC_CHANNEL 0 // SET ME! CHECK YOUR SETUP: analog input channel to track #define ADC_CNT_RANGE 0xFFFF // 2^16= 0xFFFF (16 bit converter) #define ADC_GAIN S826_ADC_GAIN_1 // -10 to 10 option #define ADC_VRANGE 20 // this must correspond to gain setting #define ADC_ENABLE 1 int main() { int errcode = S826_ERR_OK; int boardflags = S826_SystemOpen(); // open 826 driver and find all 826 boards int slotdata; // adc data from the slot of interest int ncount = 0; uint dacout; double voltagein = 0.0; double voltageout = 0; double v_prev = 0.0; double A_coeff = 0.84606; double B_coeff = 0.15394; // instantiate our "real time" object that will pace our loop RealTime realTime(SAMPLE_RATE); // Configure data achqisition interfaces and start them running. X826(S826_AdcSlotConfigWrite(IO_BOARD_NUM, ADC_SLOT, ADC_CHANNEL, 0, ADC_GAIN)); // program adc timeslot attributes: slot, chan, 0us settling time. For -5V-5V use: "S826_ADC_GAIN_2" X826(S826_AdcSlotlistWrite(IO_BOARD_NUM, 1 << ADC_SLOT, S826_BITWRITE)); // enable adc timeslot; disable all other slots X826(S826_AdcEnableWrite(IO_BOARD_NUM, ADC_ENABLE)); // enable adc conversions X826(S826_DacRangeWrite(IO_BOARD_NUM, DAC_CHANNEL, DAC_CONFIG_GAIN, 0)); // program dac output range: -10V to +10V // commence pseudo-real-time loop. realTime.Start(); while (!_kbhit()) { // read ADC sample X826(AdcReadSlot(IO_BOARD_NUM, ADC_SLOT, &slotdata)); signed short int adcin = slotdata; // get the ADC sample as a voltage voltagein = (double)(adcin * ADC_VRANGE) / ADC_CNT_RANGE; voltageout = (A_coeff * v_prev) + (B_coeff * voltagein); // set v_prev for use in next iteration through loop v_prev = voltageout; // scale the desired voltage to the DAC integer output. dacout = (uint)(voltageout * (DAC_CNT_RANGE / DAC_VRANGE) + DAC_OFFSET_COUNTS); // output to the DAC X826(S826_DacDataWrite(IO_BOARD_NUM, DAC_CHANNEL, dacout, 0)); realTime.Sleep(); ncount++; } realTime.Stop(ncount); // stop real-time loop X826(S826_DacDataWrite(IO_BOARD_NUM, DAC_CHANNEL, DAC_ZERO_OUTPUT, 0)); // put to zero at the end S826_SystemClose(); return 0; }