The Technology Partnership / Mbed 2 deprecated MEMSPCR_Control_Program_AD_Logging_Sync

ADC logging with demo drive board for calibration ADC read synchronised with heater on time

Dependencies:   mbed MODSERIAL FastPWM ADS8568_ADC

main.cpp@25:f507cfd50fcc, 2019-10-09 (annotated)

Committer:
justinbuckland
Date:
Wed Oct 09 17:36:51 2019 +0000
Revision:
25:f507cfd50fcc
Parent:
24:899071abfc14
Child:
26:323238949f9d
synchronised ADC read and heater pulses, 10x ADC read per pulse

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AlexStokoe 0:362148ad8f6f 1 #include "mbed.h"
justinbuckland 16:2c563709cf09 2 #include "ADS8568_ADC.h"
justinbuckland 25:f507cfd50fcc 3 // #include "FastPWM.h"
justinbuckland 16:2c563709cf09 4 #include "MODSERIAL.h"
AlexStokoe 0:362148ad8f6f 5
justinbuckland 25:f507cfd50fcc 6 #define MEAS_DELAY 50 // measurement delay after turning on FET (us)
justinbuckland 25:f507cfd50fcc 7 #define LOG_INTERVAL 1000 // log file interval (ms)
justinbuckland 16:2c563709cf09 8 #define START_DELAY 1000 // pause for startup (ms)
justinbuckland 22:aba3ee6df08e 9 #define N_STEPS 100
justinbuckland 25:f507cfd50fcc 10 #define N_READ 10
justinbuckland 16:2c563709cf09 11 #define BUFFER_SIZE 4096
AlexStokoe 0:362148ad8f6f 12
justinbuckland 17:25831977b98e 13 //UID lookup address and pointer
justinbuckland 17:25831977b98e 14 #define UID_ADDR 0x1FFF7A10
justinbuckland 17:25831977b98e 15 unsigned long *uid = (unsigned long *) UID_ADDR;
justinbuckland 17:25831977b98e 16
justinbuckland 17:25831977b98e 17 //UID and drive board calibration table
justinbuckland 17:25831977b98e 18 #define UID_TABLE_LENGTH 4
justinbuckland 17:25831977b98e 19
justinbuckland 17:25831977b98e 20 int drive_board_serial_number[UID_TABLE_LENGTH] =
justinbuckland 17:25831977b98e 21 {1,
justinbuckland 17:25831977b98e 22 2,
justinbuckland 17:25831977b98e 23 3,
justinbuckland 17:25831977b98e 24 4};
justinbuckland 17:25831977b98e 25
justinbuckland 17:25831977b98e 26 unsigned long drive_board_uid[UID_TABLE_LENGTH][3] =
justinbuckland 17:25831977b98e 27 {{0x005B0060, 0x32375101, 0x32363531},
paullj 21:4833e7fbcec7 28 {0x0051003D, 0x32375114, 0x30333732},
paullj 21:4833e7fbcec7 29 {0x00520060, 0x32375101, 0x32363531},
paullj 21:4833e7fbcec7 30 {0x00570060, 0x32375101, 0x32363531}};
justinbuckland 17:25831977b98e 31
justinbuckland 19:ab2d7aa17a20 32 float drive_board_cal[UID_TABLE_LENGTH][2][2] =
paullj 21:4833e7fbcec7 33 {{{0.096724353, 10.1817431}, {0.056098807, 10.19962849}},
justinbuckland 23:1d3a1d61c2b3 34 {{0.0596907336847412, 10.1550084867437}, {0.0320376283698263, 10.2580153464834}},
justinbuckland 25:f507cfd50fcc 35 {{0.01887149, 10.39360225}, {0.03115874, 10.28199855}},
justinbuckland 25:f507cfd50fcc 36 {{0.052545339, 10.06008621}, {0.094239471, 10.11983777}}};
justinbuckland 17:25831977b98e 37
justinbuckland 16:2c563709cf09 38 MODSERIAL pc(PA_9, PA_10, BUFFER_SIZE); //mcu TX, RX, BUFFER_SIZE byte TX and RX buffers
justinbuckland 16:2c563709cf09 39 ADS8568_ADC adc(PB_15, PB_14, PB_13, PB_12, PC_15, PC_0, PC_1, PC_2, PC_3);
justinbuckland 16:2c563709cf09 40 I2C i2c(PB_7, PB_8); //SDA, SCL
sophiemeredith 11:8e6c8e654004 41 Timer timer;
justinbuckland 16:2c563709cf09 42 DigitalIn adc_busy(PA_8); //Busy interrupt sig#
sophiemeredith 11:8e6c8e654004 43
justinbuckland 16:2c563709cf09 44 //Heater Control
justinbuckland 25:f507cfd50fcc 45 DigitalOut drive_1(PC_9);
justinbuckland 25:f507cfd50fcc 46 DigitalOut drive_2(PC_8);
justinbuckland 25:f507cfd50fcc 47 DigitalOut guard_1(PC_7);
justinbuckland 25:f507cfd50fcc 48 DigitalOut guard_2(PC_6);
AlexStokoe 0:362148ad8f6f 49
justinbuckland 16:2c563709cf09 50 //Indicator LEDs
justinbuckland 16:2c563709cf09 51 DigitalOut hb_led(PC_13); //Green
justinbuckland 16:2c563709cf09 52 DigitalOut led_0(PC_4); //Red
justinbuckland 16:2c563709cf09 53 DigitalOut led_1(PC_5); //Green
justinbuckland 16:2c563709cf09 54
justinbuckland 25:f507cfd50fcc 55 //External LED
justinbuckland 25:f507cfd50fcc 56 DigitalOut led_ext(PB_4);
justinbuckland 25:f507cfd50fcc 57
justinbuckland 16:2c563709cf09 58 //User buttons
justinbuckland 16:2c563709cf09 59 DigitalIn user_0(PB_0);
justinbuckland 16:2c563709cf09 60 DigitalIn user_1(PB_1);
justinbuckland 16:2c563709cf09 61
justinbuckland 16:2c563709cf09 62 BusOut converts(PC_0, PC_1, PC_2, PC_3);
AlexStokoe 0:362148ad8f6f 63
AlexStokoe 0:362148ad8f6f 64 int main() {
sophiemeredith 11:8e6c8e654004 65 int eTime;
justinbuckland 16:2c563709cf09 66 int v[2], curr[2];
justinbuckland 17:25831977b98e 67 double r_adc[2], r_ohm[2];
justinbuckland 16:2c563709cf09 68
justinbuckland 16:2c563709cf09 69 int i_port[2] = {0,2};
justinbuckland 16:2c563709cf09 70 int v_port[2] = {1,3};
justinbuckland 2:23f848b21b09 71
justinbuckland 16:2c563709cf09 72 pc.baud(115200);
justinbuckland 16:2c563709cf09 73 adc.init();
AlexStokoe 0:362148ad8f6f 74
justinbuckland 25:f507cfd50fcc 75 // External LED off
justinbuckland 25:f507cfd50fcc 76 led_ext = 0;
justinbuckland 25:f507cfd50fcc 77
justinbuckland 16:2c563709cf09 78 // Initialsation - all heaters off
justinbuckland 25:f507cfd50fcc 79 drive_1 = 0;
justinbuckland 25:f507cfd50fcc 80 drive_2 = 0;
justinbuckland 25:f507cfd50fcc 81 guard_1 = 0;
justinbuckland 25:f507cfd50fcc 82 guard_2 = 0;
justinbuckland 25:f507cfd50fcc 83 // drive_1.prescaler(1);
justinbuckland 25:f507cfd50fcc 84 // drive_1.period_ticks(1000);
justinbuckland 25:f507cfd50fcc 85 // drive_1.pulsewidth_ticks(0);
justinbuckland 16:2c563709cf09 86
justinbuckland 25:f507cfd50fcc 87 // guard_1.prescaler(1);
justinbuckland 25:f507cfd50fcc 88 // guard_1.period_ticks(1000);
justinbuckland 25:f507cfd50fcc 89 // guard_1.pulsewidth_ticks(0);
justinbuckland 16:2c563709cf09 90
justinbuckland 25:f507cfd50fcc 91 // drive_2.prescaler(1);
justinbuckland 25:f507cfd50fcc 92 // drive_2.period_ticks(1000);
justinbuckland 25:f507cfd50fcc 93 // drive_2.pulsewidth_ticks(0);
justinbuckland 16:2c563709cf09 94
justinbuckland 25:f507cfd50fcc 95 // guard_2.prescaler(1);
justinbuckland 25:f507cfd50fcc 96 // guard_2.period_ticks(1000);
justinbuckland 25:f507cfd50fcc 97 // guard_2.pulsewidth_ticks(0);
justinbuckland 16:2c563709cf09 98
justinbuckland 17:25831977b98e 99 pc.printf("\r\nUnique ID: %08X %08X %08X \r\n", uid[0], uid[1], uid[2]);
paullj 21:4833e7fbcec7 100 int i_board = -1;
justinbuckland 17:25831977b98e 101 for (int i = 0; i < UID_TABLE_LENGTH; i++)
justinbuckland 17:25831977b98e 102 {
justinbuckland 17:25831977b98e 103 if (uid[0]==drive_board_uid[i][0] && uid[1]==drive_board_uid[i][1] && uid[2]==drive_board_uid[i][2])
justinbuckland 17:25831977b98e 104 {
justinbuckland 19:ab2d7aa17a20 105 i_board = i;
justinbuckland 17:25831977b98e 106 i = UID_TABLE_LENGTH;
justinbuckland 17:25831977b98e 107 }
justinbuckland 17:25831977b98e 108 }
justinbuckland 17:25831977b98e 109
paullj 21:4833e7fbcec7 110 if (i_board != -1) pc.printf("Drive board: Board %d\n",drive_board_serial_number[i_board]);
justinbuckland 17:25831977b98e 111 else pc.printf("Drive board UID match not found\n");
justinbuckland 17:25831977b98e 112
justinbuckland 17:25831977b98e 113 pc.printf("iStep, eTime, I1, V1, R1_adc, R1_ohm, I2, V2, R2_adc, R2_ohm\n");
AlexStokoe 0:362148ad8f6f 114
justinbuckland 16:2c563709cf09 115 wait_ms(START_DELAY);
justinbuckland 16:2c563709cf09 116 timer.start();
AlexStokoe 0:362148ad8f6f 117
justinbuckland 25:f507cfd50fcc 118 for (int iDelay = 1; iDelay < 3; iDelay++) {
justinbuckland 24:899071abfc14 119
sophiemeredith 12:3f1df385d781 120 for (int iStep=0; iStep<N_STEPS; iStep++) {
justinbuckland 16:2c563709cf09 121
justinbuckland 16:2c563709cf09 122 eTime = timer.read_ms();
justinbuckland 25:f507cfd50fcc 123 pc.printf("%5d, %10d,", iDelay, eTime);
justinbuckland 16:2c563709cf09 124
justinbuckland 16:2c563709cf09 125 for (int iHeater=0; iHeater <2; iHeater++) {
justinbuckland 16:2c563709cf09 126 // measure heater
justinbuckland 25:f507cfd50fcc 127 if (iHeater==0) {
justinbuckland 25:f507cfd50fcc 128 // drive_1.pulsewidth_ticks(1000);
justinbuckland 25:f507cfd50fcc 129 drive_1 = 1;
justinbuckland 25:f507cfd50fcc 130 led_0 = 1;
justinbuckland 25:f507cfd50fcc 131 led_1 = 0;
justinbuckland 25:f507cfd50fcc 132 }
justinbuckland 25:f507cfd50fcc 133 else {
justinbuckland 25:f507cfd50fcc 134 // drive_2.pulsewidth_ticks(1000);
justinbuckland 25:f507cfd50fcc 135 drive_2 = 1;
justinbuckland 25:f507cfd50fcc 136 led_0 = 0;
justinbuckland 25:f507cfd50fcc 137 led_1 = 1;
justinbuckland 25:f507cfd50fcc 138 }
justinbuckland 25:f507cfd50fcc 139
justinbuckland 25:f507cfd50fcc 140 wait_us(MEAS_DELAY*iDelay);
justinbuckland 4:694f0e328a52 141
justinbuckland 25:f507cfd50fcc 142 //Average N_READ ADC cycles
justinbuckland 25:f507cfd50fcc 143 curr[iHeater] = 0;
justinbuckland 25:f507cfd50fcc 144 v[iHeater] = 0;
justinbuckland 25:f507cfd50fcc 145 for (int iRead = 0; iRead<N_READ; iRead++) {
justinbuckland 25:f507cfd50fcc 146 //Start ADC conversion
justinbuckland 25:f507cfd50fcc 147 adc.start_conversion(15);
justinbuckland 16:2c563709cf09 148
justinbuckland 25:f507cfd50fcc 149 //Wait until ADC is free
justinbuckland 25:f507cfd50fcc 150 while(adc_busy == 1) {
justinbuckland 25:f507cfd50fcc 151 wait_us(1);
justinbuckland 25:f507cfd50fcc 152 }
justinbuckland 16:2c563709cf09 153
justinbuckland 25:f507cfd50fcc 154 //Get ADC values
justinbuckland 25:f507cfd50fcc 155 adc.read_channels();
justinbuckland 25:f507cfd50fcc 156 curr[iHeater] += adc.read_channel_result(i_port[iHeater]);
justinbuckland 25:f507cfd50fcc 157 v[iHeater] += adc.read_channel_result(v_port[iHeater]);
justinbuckland 25:f507cfd50fcc 158 }
justinbuckland 25:f507cfd50fcc 159
justinbuckland 16:2c563709cf09 160 //Turn off heater
justinbuckland 16:2c563709cf09 161 if (iHeater==0)
justinbuckland 25:f507cfd50fcc 162 // drive_1.pulsewidth_ticks(0);
justinbuckland 25:f507cfd50fcc 163 drive_1 = 0;
justinbuckland 16:2c563709cf09 164 else
justinbuckland 25:f507cfd50fcc 165 // drive_2.pulsewidth_ticks(0);
justinbuckland 25:f507cfd50fcc 166 drive_2 = 0;
justinbuckland 25:f507cfd50fcc 167
justinbuckland 25:f507cfd50fcc 168
justinbuckland 25:f507cfd50fcc 169 wait_us(MEAS_DELAY*iDelay);
sophiemeredith 14:d764e256ac6d 170
justinbuckland 25:f507cfd50fcc 171 //Calculate resistance
justinbuckland 17:25831977b98e 172 r_adc[iHeater] = (float)v[iHeater]/(float)curr[iHeater];
paullj 21:4833e7fbcec7 173 if (i_board != -1)
justinbuckland 19:ab2d7aa17a20 174 r_ohm[iHeater] = drive_board_cal[i_board][iHeater][0] + r_adc[iHeater]*drive_board_cal[i_board][iHeater][1];
justinbuckland 17:25831977b98e 175 else
justinbuckland 17:25831977b98e 176 r_ohm[iHeater] = 0.0;
justinbuckland 17:25831977b98e 177
justinbuckland 16:2c563709cf09 178
justinbuckland 16:2c563709cf09 179 //Write output for iHeater
justinbuckland 19:ab2d7aa17a20 180 pc.printf("%10d, %10d, %10.6f, %10.6f,", curr[iHeater], v[iHeater], r_adc[iHeater], r_ohm[iHeater]);
justinbuckland 24:899071abfc14 181
justinbuckland 24:899071abfc14 182 //Wait before drivinng other heater
justinbuckland 24:899071abfc14 183 wait_ms(LOG_INTERVAL/2);
justinbuckland 24:899071abfc14 184
justinbuckland 16:2c563709cf09 185 }
justinbuckland 25:f507cfd50fcc 186 pc.printf("\n");
justinbuckland 25:f507cfd50fcc 187 }
justinbuckland 25:f507cfd50fcc 188
justinbuckland 16:2c563709cf09 189 }
justinbuckland 24:899071abfc14 190
justinbuckland 25:f507cfd50fcc 191 // turn everything off
justinbuckland 25:f507cfd50fcc 192 drive_1 = 0;
justinbuckland 25:f507cfd50fcc 193 drive_2 = 0;
justinbuckland 25:f507cfd50fcc 194 led_0 = 0;
justinbuckland 25:f507cfd50fcc 195 led_1 = 0;
justinbuckland 25:f507cfd50fcc 196
justinbuckland 5:67e4ee9a00dc 197 }