Ian Wolf / Mbed OS ReadingInLines_copy

Dependencies:   PWM-Coil-driver

Fork of TEMPFINALInterrupt_copy by Ian Wolf

main.cpp@2:4425049f4174, 2017-08-31 (annotated)

Committer:
iwolf32
Date:
Thu Aug 31 13:57:01 2017 +0000
Revision:
2:4425049f4174
Parent:
1:1de97b1145f3
Child:
3:60a74a913c40
No character constraints;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
212600191 0:1f9fae46bbe1 1 #include "mbed.h"
iwolf32 2:4425049f4174 2 #include <string>
212600191 1:1de97b1145f3 3
212600191 1:1de97b1145f3 4 // Read temperature from MAX1363 3-channel ADC
212600191 1:1de97b1145f3 5
212600191 1:1de97b1145f3 6 I2C i2c(PB_9 , PB_8);
iwolf32 2:4425049f4174 7 DigitalOut Relay(D7);
iwolf32 2:4425049f4174 8 Serial pc(SERIAL_TX, SERIAL_RX);
212600191 1:1de97b1145f3 9
iwolf32 2:4425049f4174 10 std::string str;
iwolf32 2:4425049f4174 11 char ch;
iwolf32 2:4425049f4174 12 double SetTemp=0;
iwolf32 2:4425049f4174 13 float x=0;
212600191 1:1de97b1145f3 14
212600191 1:1de97b1145f3 15 // address information for the Serenity temperature sensor device
212600191 1:1de97b1145f3 16 const int SLAVE_ADDRESS = 0x34 << 1;
212600191 1:1de97b1145f3 17
212600191 1:1de97b1145f3 18 // MAX1363 registers
212600191 1:1de97b1145f3 19 const unsigned char MAX1363_CONFIG_REG = 0x03; // single-ended inputs, read CH0-CH1 only
212600191 1:1de97b1145f3 20 const unsigned char MAX1363_SETUP_REG = 0xF2; // AIN3=output, INT REF always on
212600191 1:1de97b1145f3 21
212600191 1:1de97b1145f3 22 // MAX1363 high byte format (byte 2 is D7-D0)
212600191 1:1de97b1145f3 23 const unsigned char MAX1363_VALID_MASK = 0x90; // HIGH bit and 12/10 bit should always be 1
212600191 1:1de97b1145f3 24 const unsigned char MAX1363_HIGH_DATA_MASK = 0x0F;
212600191 1:1de97b1145f3 25
212600191 1:1de97b1145f3 26 // channel address (0-3) is in CH1/CH0 (bits 5/6)
212600191 1:1de97b1145f3 27 const unsigned char MAX1363_CHANNEL_MASK = 0x60;
212600191 1:1de97b1145f3 28 const unsigned char MAX1363_CHANNEL_SHIFT = 5;
212600191 0:1f9fae46bbe1 29
212600191 1:1de97b1145f3 30 /** conversion factors */
212600191 1:1de97b1145f3 31 const float CONV_COEFF_A3 = 4.39403;
212600191 1:1de97b1145f3 32 const float CONV_COEFF_A2 = -11.15;
212600191 1:1de97b1145f3 33 const float CONV_COEFF_A1 = 36.4955;
212600191 1:1de97b1145f3 34 const float CONV_COEFF_A0 = 266.909;
212600191 1:1de97b1145f3 35
212600191 1:1de97b1145f3 36 const int CONV_N = 12;
212600191 1:1de97b1145f3 37 const float CONV_VREF = 2.048;
212600191 1:1de97b1145f3 38
212600191 1:1de97b1145f3 39 const float CONV_K_TO_C = -272.15;
212600191 0:1f9fae46bbe1 40
212600191 1:1de97b1145f3 41 float AdcToC(unsigned int _adc)
212600191 1:1de97b1145f3 42 {
212600191 1:1de97b1145f3 43 float d = CONV_VREF * _adc / (1L << CONV_N);
212600191 1:1de97b1145f3 44 float d2 = d*d;
212600191 1:1de97b1145f3 45 float d3 = d2*d;
212600191 1:1de97b1145f3 46 float temp_k = (CONV_COEFF_A3 * d3) +
212600191 1:1de97b1145f3 47 (CONV_COEFF_A2 * d2) +
212600191 1:1de97b1145f3 48 (CONV_COEFF_A1 * d) +
212600191 1:1de97b1145f3 49 CONV_COEFF_A0;
212600191 1:1de97b1145f3 50 return temp_k + CONV_K_TO_C;
212600191 1:1de97b1145f3 51 }
212600191 0:1f9fae46bbe1 52
iwolf32 2:4425049f4174 53 void callback(){
iwolf32 2:4425049f4174 54 ch=pc.getc();
iwolf32 2:4425049f4174 55 str+=ch;
iwolf32 2:4425049f4174 56 SetTemp= atof(str.c_str());
iwolf32 2:4425049f4174 57 return;
iwolf32 2:4425049f4174 58 }
iwolf32 2:4425049f4174 59
iwolf32 2:4425049f4174 60
212600191 0:1f9fae46bbe1 61 int main() {
iwolf32 2:4425049f4174 62 pc.baud(115200);
iwolf32 2:4425049f4174 63
iwolf32 2:4425049f4174 64 pc.attach(&callback);
212600191 1:1de97b1145f3 65
212600191 1:1de97b1145f3 66 // reserve 4 bytes for transfer
212600191 1:1de97b1145f3 67 char cmd[4];
212600191 1:1de97b1145f3 68
212600191 1:1de97b1145f3 69 // initialize the adc device
212600191 1:1de97b1145f3 70 cmd[0] = MAX1363_CONFIG_REG;
212600191 1:1de97b1145f3 71 cmd[1] = MAX1363_SETUP_REG;
212600191 1:1de97b1145f3 72 i2c.write(SLAVE_ADDRESS, cmd, 2);
212600191 1:1de97b1145f3 73
212600191 1:1de97b1145f3 74 // holds raw adc values as we convert them
212600191 1:1de97b1145f3 75 unsigned int adc[2] = {0};
212600191 1:1de97b1145f3 76 float values[2] = {0};
212600191 1:1de97b1145f3 77
212600191 0:1f9fae46bbe1 78 while (1) {
iwolf32 2:4425049f4174 79 //Clear string holding the input from serial
iwolf32 2:4425049f4174 80 str.clear();
iwolf32 2:4425049f4174 81
iwolf32 2:4425049f4174 82 wait(1);
212600191 1:1de97b1145f3 83
212600191 1:1de97b1145f3 84 // clear buffer, only to detect invalid data
212600191 0:1f9fae46bbe1 85 cmd[0] = 0x00;
212600191 1:1de97b1145f3 86 cmd[1] = 0x00;
212600191 1:1de97b1145f3 87 cmd[2] = 0x00;
212600191 1:1de97b1145f3 88 cmd[3] = 0x00;
212600191 1:1de97b1145f3 89
212600191 1:1de97b1145f3 90 // read 4 bytes from
212600191 1:1de97b1145f3 91 i2c.read(SLAVE_ADDRESS, cmd, 4);
212600191 1:1de97b1145f3 92
212600191 1:1de97b1145f3 93 for (int i=0; i<4; i+=2) {
212600191 1:1de97b1145f3 94 // first 4 bits contain expected bits and channel id
212600191 1:1de97b1145f3 95 if ((cmd[i] & MAX1363_VALID_MASK) == MAX1363_VALID_MASK) {
212600191 1:1de97b1145f3 96 unsigned char ch = ((cmd[i] & MAX1363_CHANNEL_MASK) >> MAX1363_CHANNEL_SHIFT);
212600191 1:1de97b1145f3 97 adc[ch] = ((int)(cmd[i] & MAX1363_HIGH_DATA_MASK) << 8) | cmd[i+1];
212600191 1:1de97b1145f3 98 values[ch] = AdcToC(adc[ch]);
212600191 1:1de97b1145f3 99 } else {
212600191 1:1de97b1145f3 100 // handle invalid data
212600191 1:1de97b1145f3 101 }
212600191 1:1de97b1145f3 102 }
iwolf32 2:4425049f4174 103 x=values[1];
iwolf32 2:4425049f4174 104 if (x<SetTemp){
iwolf32 2:4425049f4174 105 Relay=0;
iwolf32 2:4425049f4174 106 }
iwolf32 2:4425049f4174 107 if (x>SetTemp+1){
iwolf32 2:4425049f4174 108 Relay=1;
iwolf32 2:4425049f4174 109 }
212600191 1:1de97b1145f3 110 // output temperature data
iwolf32 2:4425049f4174 111 printf("%0.2f\t %0.2f\t %0.2f\r\n", SetTemp, values[0], values[1]);
iwolf32 2:4425049f4174 112
212600191 0:1f9fae46bbe1 113 }
212600191 1:1de97b1145f3 114 }