Ian Wolf / Mbed 2 deprecated UpdateTempSetThreading

Temp setting is updated by a thread. Main loop grabs, prints, and manages temperature feedback

Dependencies:   mbed-rtos mbed

Fork of Temperature_Reading1 by jack kemnitz

main.cpp@2:2e95521439cb, 2017-08-29 (annotated)

Committer:
iwolf32
Date:
Tue Aug 29 14:35:13 2017 +0000
Revision:
2:2e95521439cb
Parent:
1:1de97b1145f3 
Update Threading version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
212600191 0:1f9fae46bbe1 1 #include "mbed.h"
iwolf32 2:2e95521439cb 2 #include "rtos.h"
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);
212600191 1:1de97b1145f3 7
iwolf32 2:2e95521439cb 8 DigitalOut Relay(D7);
iwolf32 2:2e95521439cb 9
212600191 1:1de97b1145f3 10 Serial pc(SERIAL_TX, SERIAL_RX);
212600191 1:1de97b1145f3 11
iwolf32 2:2e95521439cb 12 float x=0;
iwolf32 2:2e95521439cb 13 double SetTemp=0;
iwolf32 2:2e95521439cb 14 Thread UpdatePressure_t;
iwolf32 2:2e95521439cb 15
212600191 1:1de97b1145f3 16 // address information for the Serenity temperature sensor device
212600191 1:1de97b1145f3 17 const int SLAVE_ADDRESS = 0x34 << 1;
212600191 1:1de97b1145f3 18
212600191 1:1de97b1145f3 19 // MAX1363 registers
212600191 1:1de97b1145f3 20 const unsigned char MAX1363_CONFIG_REG = 0x03; // single-ended inputs, read CH0-CH1 only
212600191 1:1de97b1145f3 21 const unsigned char MAX1363_SETUP_REG = 0xF2; // AIN3=output, INT REF always on
212600191 1:1de97b1145f3 22
212600191 1:1de97b1145f3 23 // MAX1363 high byte format (byte 2 is D7-D0)
212600191 1:1de97b1145f3 24 const unsigned char MAX1363_VALID_MASK = 0x90; // HIGH bit and 12/10 bit should always be 1
212600191 1:1de97b1145f3 25 const unsigned char MAX1363_HIGH_DATA_MASK = 0x0F;
212600191 1:1de97b1145f3 26
212600191 1:1de97b1145f3 27 // channel address (0-3) is in CH1/CH0 (bits 5/6)
212600191 1:1de97b1145f3 28 const unsigned char MAX1363_CHANNEL_MASK = 0x60;
212600191 1:1de97b1145f3 29 const unsigned char MAX1363_CHANNEL_SHIFT = 5;
212600191 0:1f9fae46bbe1 30
212600191 1:1de97b1145f3 31 /** conversion factors */
212600191 1:1de97b1145f3 32 const float CONV_COEFF_A3 = 4.39403;
212600191 1:1de97b1145f3 33 const float CONV_COEFF_A2 = -11.15;
212600191 1:1de97b1145f3 34 const float CONV_COEFF_A1 = 36.4955;
212600191 1:1de97b1145f3 35 const float CONV_COEFF_A0 = 266.909;
212600191 1:1de97b1145f3 36
212600191 1:1de97b1145f3 37 const int CONV_N = 12;
212600191 1:1de97b1145f3 38 const float CONV_VREF = 2.048;
212600191 1:1de97b1145f3 39
212600191 1:1de97b1145f3 40 const float CONV_K_TO_C = -272.15;
212600191 0:1f9fae46bbe1 41
212600191 1:1de97b1145f3 42 float AdcToC(unsigned int _adc)
212600191 1:1de97b1145f3 43 {
212600191 1:1de97b1145f3 44 float d = CONV_VREF * _adc / (1L << CONV_N);
212600191 1:1de97b1145f3 45 float d2 = d*d;
212600191 1:1de97b1145f3 46 float d3 = d2*d;
212600191 1:1de97b1145f3 47 float temp_k = (CONV_COEFF_A3 * d3) +
212600191 1:1de97b1145f3 48 (CONV_COEFF_A2 * d2) +
212600191 1:1de97b1145f3 49 (CONV_COEFF_A1 * d) +
212600191 1:1de97b1145f3 50 CONV_COEFF_A0;
212600191 1:1de97b1145f3 51 return temp_k + CONV_K_TO_C;
212600191 1:1de97b1145f3 52 }
iwolf32 2:2e95521439cb 53 //------------------------------------------------------------------
iwolf32 2:2e95521439cb 54 //Function for Getting Temperature Setting
iwolf32 2:2e95521439cb 55 void TempSetInit(){
iwolf32 2:2e95521439cb 56 char buffer[]={'0','0','0','0','0','\0'};
iwolf32 2:2e95521439cb 57 char ch;
212600191 0:1f9fae46bbe1 58
iwolf32 2:2e95521439cb 59 while(pc.readable()==0){
iwolf32 2:2e95521439cb 60 }
iwolf32 2:2e95521439cb 61 if (pc.readable()==1){
iwolf32 2:2e95521439cb 62 for (int index=0; index<5; index=index+1){
iwolf32 2:2e95521439cb 63 ch=pc.getc();
iwolf32 2:2e95521439cb 64 buffer[index]=ch;
iwolf32 2:2e95521439cb 65 }
iwolf32 2:2e95521439cb 66 SetTemp= atof(buffer);
iwolf32 2:2e95521439cb 67
iwolf32 2:2e95521439cb 68 }
iwolf32 2:2e95521439cb 69 }
iwolf32 2:2e95521439cb 70 void TempSet(){
iwolf32 2:2e95521439cb 71 while(1){
iwolf32 2:2e95521439cb 72 char buffer[]={'0','0','0','0','0','\0'};
iwolf32 2:2e95521439cb 73 char ch;
iwolf32 2:2e95521439cb 74
iwolf32 2:2e95521439cb 75 while(pc.readable()==0){
iwolf32 2:2e95521439cb 76 }
iwolf32 2:2e95521439cb 77 if (pc.readable()==1){
iwolf32 2:2e95521439cb 78 wait(0.1);
iwolf32 2:2e95521439cb 79 for (int index=0; index<5; index=index+1){
iwolf32 2:2e95521439cb 80 ch=pc.getc();
iwolf32 2:2e95521439cb 81 buffer[index]=ch;
iwolf32 2:2e95521439cb 82 }
iwolf32 2:2e95521439cb 83 SetTemp= atof(buffer);
iwolf32 2:2e95521439cb 84 }
iwolf32 2:2e95521439cb 85 }
iwolf32 2:2e95521439cb 86 }
iwolf32 2:2e95521439cb 87 //------------------------------------------------------------------
212600191 0:1f9fae46bbe1 88 int main() {
iwolf32 2:2e95521439cb 89 pc.baud(115200);
212600191 1:1de97b1145f3 90
212600191 1:1de97b1145f3 91 // reserve 4 bytes for transfer
212600191 1:1de97b1145f3 92 char cmd[4];
212600191 1:1de97b1145f3 93
212600191 1:1de97b1145f3 94 // initialize the adc device
212600191 1:1de97b1145f3 95 cmd[0] = MAX1363_CONFIG_REG;
212600191 1:1de97b1145f3 96 cmd[1] = MAX1363_SETUP_REG;
212600191 1:1de97b1145f3 97 i2c.write(SLAVE_ADDRESS, cmd, 2);
212600191 1:1de97b1145f3 98
212600191 1:1de97b1145f3 99 // holds raw adc values as we convert them
212600191 1:1de97b1145f3 100 unsigned int adc[2] = {0};
212600191 1:1de97b1145f3 101 float values[2] = {0};
212600191 1:1de97b1145f3 102
iwolf32 2:2e95521439cb 103 //Get initial Temperature Setting
iwolf32 2:2e95521439cb 104 TempSetInit();
iwolf32 2:2e95521439cb 105
iwolf32 2:2e95521439cb 106 //Continuously check for new temp settings
iwolf32 2:2e95521439cb 107 UpdatePressure_t.set_priority(osPriorityHigh);
iwolf32 2:2e95521439cb 108 UpdatePressure_t.start(TempSet);
iwolf32 2:2e95521439cb 109
212600191 0:1f9fae46bbe1 110 while (1) {
iwolf32 2:2e95521439cb 111 wait(0.05);
212600191 1:1de97b1145f3 112
212600191 1:1de97b1145f3 113 // clear buffer, only to detect invalid data
212600191 0:1f9fae46bbe1 114 cmd[0] = 0x00;
212600191 1:1de97b1145f3 115 cmd[1] = 0x00;
212600191 1:1de97b1145f3 116 cmd[2] = 0x00;
212600191 1:1de97b1145f3 117 cmd[3] = 0x00;
212600191 1:1de97b1145f3 118
212600191 1:1de97b1145f3 119 // read 4 bytes from
212600191 1:1de97b1145f3 120 i2c.read(SLAVE_ADDRESS, cmd, 4);
212600191 1:1de97b1145f3 121
212600191 1:1de97b1145f3 122 for (int i=0; i<4; i+=2) {
212600191 1:1de97b1145f3 123 // first 4 bits contain expected bits and channel id
212600191 1:1de97b1145f3 124 if ((cmd[i] & MAX1363_VALID_MASK) == MAX1363_VALID_MASK) {
212600191 1:1de97b1145f3 125 unsigned char ch = ((cmd[i] & MAX1363_CHANNEL_MASK) >> MAX1363_CHANNEL_SHIFT);
212600191 1:1de97b1145f3 126 adc[ch] = ((int)(cmd[i] & MAX1363_HIGH_DATA_MASK) << 8) | cmd[i+1];
212600191 1:1de97b1145f3 127 values[ch] = AdcToC(adc[ch]);
212600191 1:1de97b1145f3 128 } else {
212600191 1:1de97b1145f3 129 // handle invalid data
212600191 1:1de97b1145f3 130 }
212600191 1:1de97b1145f3 131 }
212600191 1:1de97b1145f3 132
iwolf32 2:2e95521439cb 133 //Temperature control
iwolf32 2:2e95521439cb 134 x=values[1];
iwolf32 2:2e95521439cb 135 if (x<SetTemp){
iwolf32 2:2e95521439cb 136 Relay=0;
iwolf32 2:2e95521439cb 137 }
iwolf32 2:2e95521439cb 138 if (x>SetTemp+1){
iwolf32 2:2e95521439cb 139 Relay=1;
iwolf32 2:2e95521439cb 140 }
iwolf32 2:2e95521439cb 141 printf("%0.2f\t %0.2f\t %0.2f\r\n", SetTemp, values[0], values[1]);
212600191 0:1f9fae46bbe1 142 }
212600191 1:1de97b1145f3 143 }