Christina Lanier
/
Lab2
Lab 3 code given by professor and annotated
Fork of Lab2 by
main.cpp
- Committer:
- LanierUSNA16
- Date:
- 2014-09-11
- Revision:
- 0:f2dca9ac559f
File content as of revision 0:f2dca9ac559f:
#include "mbed.h" // APIs Serial pc(USBTX, USBRX); // tx, rx for serial USB interface to pc SPI spi_max1270(p5, p6, p7); SPI spi(p5, p6, p7); DigitalOut max1270_cs(p8); //MAX1270 ADC CS DigitalOut mot1_ph1(p21); DigitalOut mot1_ph2(p22); PwmOut mot_en1(p23); LocalFileSystem local("local"); // Create the local filesystem under the name "local" int read_max1270(int chan, int range, int bipol){ int cword=0x80; //set the start bit spi_max1270.frequency(10000000); spi_max1270.format(8, 0); // 8 data bits, CPOL0, and CPHA0 (datasheet Digital Interface) cword |= (chan << 4); //shift channel cword |= (range << 3); cword |= (bipol << 2); max1270_cs = 0; spi_max1270.write(cword); wait_us(15); //15us spi_max1270.format(12, 3); int result = spi_max1270.write(0); max1270_cs = 1; spi_max1270.format(8, 0); return result; } float read_max1270_volts(int chan, int range, int bipol){ float rangevolts=0.0; float volts=0.0; int adc_res; //read the ADC converter adc_res = read_max1270(chan, range, bipol) & 0xFFF; //Determine the voltage range if(range) //RNG bit rangevolts=10.0; else rangevolts=5.0; //bi-polar input range if(bipol){ //BIP is set, input is +/- if(adc_res < 0x800){ //if result was positive volts = ((float)adc_res/0x7FF) * rangevolts; } else{ //result was negative volts = -(-((float)adc_res/0x7FF) * rangevolts) - (rangevolts * 2.0); } } else{ //input is positive polarity only volts = ((float)adc_res/0xFFF) * rangevolts; } return volts; } float Tank1,Tank2,dt,h1,h2; float Ts = 1.0; // Sampling period 1/Ts Hz //float Tl = XXXX; // Logging period float c1 = 5.5/(0.9819-0.0831); // cm/V float c2 = 2.3/(0.977-0.171); // cm/V //float v10 = -X.XX; // V //float v20 = -X.XX; // V // Arrays for data storage float etime[200]; float t1v[200]; float t2v[200]; float t1h[200]; float t2h[200]; float dcp[200]; Timer t; // Open "results.M" on the local file system for writing FILE *fp = fopen("/local/results.M", "w"); float cntr; float dc; int k; int main () { pc.baud(921600); // Establish baud rate mot_en1.period_us(50); // Set PWM length to 50 us max1270_cs = 1; // Activate A/D cntr = 0.0; // cntr used to keep track of sample period and elpased time // initialize data vectors for(k=0;k<200;k++) { etime[k] = 0.0; t1v[k] = 0.0; t2v[k] = 0.0; //t1h[k] = 0.0; //t2h[k] = 0.0; dcp[k] = 0.0; } k = 0; // Reset index counter while(cntr*Ts <= 180) { t.start(); // start measuring comp time // Read pressure sensors Tank1 = read_max1270_volts(1, 1, 1); Tank2 = read_max1270_volts(0, 1, 1); // Convert pressure voltage to tank height //h1 = c1*(Tank1 - v10); //h2 = c2*(Tank2 - v20); // Drive pump for ID //if (cntr*Ts <= 5) { // dc = 0.0; // } else if (cntr*Ts <= 180) { dc = -0.7; //<***CHANGE THIS***> } else { dc = 0.0; } if(dc > 0.0){ mot1_ph2 = 0; mot1_ph1 = 1; mot_en1 = dc; } else if(dc < -0.0){ mot1_ph1 = 0; mot1_ph2 = 1; mot_en1 = abs(dc);} // Log data etime[k] = cntr*Ts; t1v[k] = Tank1; t2v[k] = Tank2; //t1h[k] = h1; //t2h[k] = h2; dcp[k] = -dc; k++; t.stop(); // end measuring comp time dt = Ts-t.read(); pc.printf("%5.2f %5.2f %5.2f %5.2f \n\r",cntr*Ts,Tank1,Tank2,dc); //pc.printf("%5.2f %5.2f %5.2f %5.2f %5.2f %5.2f \n\r",cntr*Ts,Tank1,Tank2,h1,h2,dc); t.reset(); cntr=cntr+1; wait(dt); // wait to ensure sampling period set by Ts }//while mot1_ph2 = 0; mot_en1 = 0.0; // Print out log variables in MATLAB structured variable format. pc.printf("Printing log variables to file on mBed ... "); if(1) { for(k=0; k<180; k++) { fprintf(fp,"t(%d,1) = %.5f;\n",k+1,etime[k]); fprintf(fp,"t1v(%d,1) = %.5f;\n",k+1,t1v[k]); fprintf(fp,"t2v(%d,1) = %.5f;\n",k+1,t2v[k]); //fprintf(fp,"t1h(%d,1) = %.5f;\n",k+1,t1h[k]); //fprintf(fp,"t2h(%d,1) = %.5f;\n",k+1,t2h[k]); fprintf(fp,"dcp(%d,1) = %.5f;\n",k+1,dcp[k]); } } printf("done.\r\n"); // Close file fclose(fp); }//main