The Technology Partnership / Mbed 2 deprecated MEMSPCR_Control_Program_AD_Logging_Demo_PCB

ADC logging with demo drive board for calibration

Dependencies:   mbed MODSERIAL FastPWM ADS8568_ADC

main.cpp@5:67e4ee9a00dc, 2018-08-06 (annotated)

Committer:
justinbuckland
Date:
Mon Aug 06 13:34:33 2018 +0000
Revision:
5:67e4ee9a00dc
Parent:
4:694f0e328a52
Child:
6:75b09f0bcbd9
Log resistance;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AlexStokoe 0:362148ad8f6f 1 #include "mbed.h"
AlexStokoe 0:362148ad8f6f 2
justinbuckland 5:67e4ee9a00dc 3 #define CH_A 1 // value of convst bus to read channel A only
justinbuckland 5:67e4ee9a00dc 4 #define CH_AC 5 // value of convst bus to read channels A and C
justinbuckland 5:67e4ee9a00dc 5 #define CH_ABCD 15 // value of convst bus to read all chanels simultaneously
AlexStokoe 0:362148ad8f6f 6
AlexStokoe 0:362148ad8f6f 7 Serial pc(USBTX, USBRX); // tx, rx
AlexStokoe 0:362148ad8f6f 8
justinbuckland 5:67e4ee9a00dc 9 DigitalOut drive(p21);
justinbuckland 5:67e4ee9a00dc 10 DigitalOut yLED(p27);
justinbuckland 5:67e4ee9a00dc 11 DigitalOut gLED(p28);
justinbuckland 5:67e4ee9a00dc 12 DigitalOut rLED(p26);
AlexStokoe 0:362148ad8f6f 13
AlexStokoe 0:362148ad8f6f 14 AnalogIn battVolt(p19);
AlexStokoe 0:362148ad8f6f 15 AnalogIn auxVolt(p20);
AlexStokoe 0:362148ad8f6f 16
AlexStokoe 0:362148ad8f6f 17 BusOut convt(p11, p12, p13, p14);
justinbuckland 5:67e4ee9a00dc 18 SPI spi(p5, p6, p7); // mosi, miso, sclk
justinbuckland 5:67e4ee9a00dc 19 DigitalOut cs(p8); //chip select
AlexStokoe 0:362148ad8f6f 20 DigitalIn busy(p9);
AlexStokoe 0:362148ad8f6f 21 DigitalOut reset(p10);
AlexStokoe 0:362148ad8f6f 22
AlexStokoe 0:362148ad8f6f 23 char buffer16[16];
AlexStokoe 0:362148ad8f6f 24 int val_array[8];
AlexStokoe 0:362148ad8f6f 25 const char dummy = 0;
justinbuckland 5:67e4ee9a00dc 26 int drivetime_ms;
AlexStokoe 0:362148ad8f6f 27
justinbuckland 5:67e4ee9a00dc 28 char outString[100];
AlexStokoe 0:362148ad8f6f 29
justinbuckland 5:67e4ee9a00dc 30 int readChannels (char buffer[16], int values[8]){
justinbuckland 2:23f848b21b09 31 //simultaneously samples and reads into buffer
AlexStokoe 0:362148ad8f6f 32 short int val_array[8];
justinbuckland 2:23f848b21b09 33
justinbuckland 2:23f848b21b09 34 //send convert signal to channels
justinbuckland 2:23f848b21b09 35 convt = CH_AC;
justinbuckland 2:23f848b21b09 36 wait_us(1);
justinbuckland 2:23f848b21b09 37 convt = 0;
justinbuckland 2:23f848b21b09 38
justinbuckland 2:23f848b21b09 39 //SPI(like) data transfer
justinbuckland 2:23f848b21b09 40 cs = 0;
justinbuckland 2:23f848b21b09 41 spi.write(&dummy, 1, buffer, 16);
justinbuckland 2:23f848b21b09 42 cs=1;
justinbuckland 2:23f848b21b09 43
justinbuckland 2:23f848b21b09 44 //loop over bytes to add channel voltage values
justinbuckland 2:23f848b21b09 45 for (int i=0; i<8; i++){
justinbuckland 2:23f848b21b09 46 val_array[i] = buffer[2*i]<<8 | buffer16[(2*i) + 1];
justinbuckland 2:23f848b21b09 47 values [i] = val_array[i];
justinbuckland 5:67e4ee9a00dc 48 }
justinbuckland 5:67e4ee9a00dc 49
justinbuckland 5:67e4ee9a00dc 50 return 0;
justinbuckland 5:67e4ee9a00dc 51 }
justinbuckland 4:694f0e328a52 52
AlexStokoe 0:362148ad8f6f 53
AlexStokoe 0:362148ad8f6f 54 int main() {
justinbuckland 5:67e4ee9a00dc 55 int n_samples = 10000;
justinbuckland 5:67e4ee9a00dc 56 double r;
justinbuckland 5:67e4ee9a00dc 57 double r_max = 0;
justinbuckland 5:67e4ee9a00dc 58 double r_min = 1e10;
justinbuckland 5:67e4ee9a00dc 59 double r_sum = 0;
justinbuckland 5:67e4ee9a00dc 60 double r_sum2 = 0;
justinbuckland 5:67e4ee9a00dc 61 double r_mean;
justinbuckland 5:67e4ee9a00dc 62 double r_mean2;
justinbuckland 5:67e4ee9a00dc 63 double r_sd;
justinbuckland 5:67e4ee9a00dc 64 double r_cv;
justinbuckland 2:23f848b21b09 65
AlexStokoe 0:362148ad8f6f 66 rLED = 0;
AlexStokoe 0:362148ad8f6f 67 yLED = 0;
AlexStokoe 0:362148ad8f6f 68 gLED = 0;
AlexStokoe 0:362148ad8f6f 69
AlexStokoe 0:362148ad8f6f 70 drive = 0;
justinbuckland 5:67e4ee9a00dc 71 drivetime_ms = 1;
justinbuckland 2:23f848b21b09 72
AlexStokoe 0:362148ad8f6f 73 pc.baud(115200);
justinbuckland 5:67e4ee9a00dc 74 pc.printf("Test start\r\n");
justinbuckland 5:67e4ee9a00dc 75
AlexStokoe 0:362148ad8f6f 76 //Reset ADC sequence
AlexStokoe 0:362148ad8f6f 77 reset = 1;
AlexStokoe 0:362148ad8f6f 78 wait_ms(1);
AlexStokoe 0:362148ad8f6f 79 reset = 0;
AlexStokoe 0:362148ad8f6f 80
AlexStokoe 0:362148ad8f6f 81 //set SPI serial to 2MHz, 16 bit data transfer, mode 2 (clock normally high, data preceeding clock cycle)
AlexStokoe 0:362148ad8f6f 82 spi.format(8,2);
AlexStokoe 0:362148ad8f6f 83 spi.frequency(2000000);
AlexStokoe 0:362148ad8f6f 84 spi.set_default_write_value(0x00);
AlexStokoe 0:362148ad8f6f 85 cs = 1;
AlexStokoe 0:362148ad8f6f 86
justinbuckland 5:67e4ee9a00dc 87 rLED = 1;
justinbuckland 5:67e4ee9a00dc 88 yLED = 0;
justinbuckland 5:67e4ee9a00dc 89 gLED = 1;
AlexStokoe 0:362148ad8f6f 90
justinbuckland 5:67e4ee9a00dc 91 sprintf(outString, "I1SIG, I1REF, V1POS, V1NEG, R\r\n");
justinbuckland 4:694f0e328a52 92 pc.printf("%s", outString);
justinbuckland 4:694f0e328a52 93
justinbuckland 5:67e4ee9a00dc 94 for (int x=0; x<n_samples; x++) {
justinbuckland 5:67e4ee9a00dc 95 drive = 1;
justinbuckland 5:67e4ee9a00dc 96 yLED = 1;
justinbuckland 5:67e4ee9a00dc 97 wait_ms(drivetime_ms);
justinbuckland 5:67e4ee9a00dc 98 readChannels (buffer16, val_array);
justinbuckland 5:67e4ee9a00dc 99 drive = 0;
justinbuckland 5:67e4ee9a00dc 100 yLED = 0;
justinbuckland 4:694f0e328a52 101
justinbuckland 5:67e4ee9a00dc 102 r = (double)(val_array[5]-val_array[4])/(double)(val_array[1]-val_array[0]);
justinbuckland 5:67e4ee9a00dc 103 if (r < r_min) { r_min = r; }
justinbuckland 5:67e4ee9a00dc 104 if (r > r_max) { r_max = r; }
justinbuckland 5:67e4ee9a00dc 105 r_sum = r_sum + r;
justinbuckland 5:67e4ee9a00dc 106 r_sum2 = r_sum2 + (r*r);
justinbuckland 5:67e4ee9a00dc 107
justinbuckland 5:67e4ee9a00dc 108 sprintf(outString, "%5d\t %5d\t %5d\t %5d\t %f\r\n", val_array[0], val_array[1], val_array[4], val_array[5], r);
justinbuckland 5:67e4ee9a00dc 109 pc.printf("%s", outString);
justinbuckland 5:67e4ee9a00dc 110 wait_ms(1000);
justinbuckland 4:694f0e328a52 111
justinbuckland 5:67e4ee9a00dc 112 }
justinbuckland 5:67e4ee9a00dc 113
justinbuckland 5:67e4ee9a00dc 114 r_mean = r_sum/n_samples;
justinbuckland 5:67e4ee9a00dc 115 r_mean2 = r_sum2/n_samples;
justinbuckland 5:67e4ee9a00dc 116 r_sd = sqrt(r_mean2-(r_mean*r_mean));
justinbuckland 5:67e4ee9a00dc 117 r_cv = r_sd/r_mean;
justinbuckland 5:67e4ee9a00dc 118
justinbuckland 5:67e4ee9a00dc 119 // pc.printf("Statistics:\r\n");
justinbuckland 5:67e4ee9a00dc 120 // pc.printf("n_samples : %d\r\n", n_samples);
justinbuckland 5:67e4ee9a00dc 121 // pc.printf("r_mean : %f\r\n", r_mean);
justinbuckland 5:67e4ee9a00dc 122 // pc.printf("r_min : %f\r\n", r_min);
justinbuckland 5:67e4ee9a00dc 123 // pc.printf("r_max : %f\r\n", r_max);
justinbuckland 5:67e4ee9a00dc 124 // pc.printf("r_sd : %f\r\n", r_sd);
justinbuckland 5:67e4ee9a00dc 125 // pc.printf("r_cv : %f\r\n", r_cv);
justinbuckland 5:67e4ee9a00dc 126
justinbuckland 5:67e4ee9a00dc 127 rLED = 0;
justinbuckland 5:67e4ee9a00dc 128
justinbuckland 5:67e4ee9a00dc 129 }