Nemanja Neskovic / Mbed 2 deprecated I2c

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Dependencies:   mbed

main.cpp@0:d66d4aaa919f, 2019-03-14 (annotated)

Committer:
nemanja1994
Date:
Thu Mar 14 18:10:31 2019 +0000
Revision:
0:d66d4aaa919f
Gg

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nemanja1994 0:d66d4aaa919f 1 #include "mbed.h"
nemanja1994 0:d66d4aaa919f 2
nemanja1994 0:d66d4aaa919f 3 #define IrThermo_Addr (0x5A<<1)
nemanja1994 0:d66d4aaa919f 4 #define Tamb 0x06
nemanja1994 0:d66d4aaa919f 5 #define Tobj 0x07
nemanja1994 0:d66d4aaa919f 6
nemanja1994 0:d66d4aaa919f 7 I2C i2c(D14, D15);
nemanja1994 0:d66d4aaa919f 8 DigitalOut myled(LED1);
nemanja1994 0:d66d4aaa919f 9 Serial console(SERIAL_TX, SERIAL_RX);
nemanja1994 0:d66d4aaa919f 10
nemanja1994 0:d66d4aaa919f 11 int temperature=0;
nemanja1994 0:d66d4aaa919f 12 char data_read[2];
nemanja1994 0:d66d4aaa919f 13 char data_write[1]= {Tobj};
nemanja1994 0:d66d4aaa919f 14 char data_add[1]= {(0x2E)};
nemanja1994 0:d66d4aaa919f 15
nemanja1994 0:d66d4aaa919f 16 void changeAddress()
nemanja1994 0:d66d4aaa919f 17 {
nemanja1994 0:d66d4aaa919f 18 //char newAddr[2]= {0x5E,0x00};
nemanja1994 0:d66d4aaa919f 19 char p1,p2;
nemanja1994 0:d66d4aaa919f 20 bool ch,ch2,ch3;
nemanja1994 0:d66d4aaa919f 21
nemanja1994 0:d66d4aaa919f 22 //----read address to make sure it worked------------
nemanja1994 0:d66d4aaa919f 23
nemanja1994 0:d66d4aaa919f 24 // send start bit
nemanja1994 0:d66d4aaa919f 25 i2c.start();
nemanja1994 0:d66d4aaa919f 26 // send universal address
nemanja1994 0:d66d4aaa919f 27 ch = i2c.write(0x00);
nemanja1994 0:d66d4aaa919f 28 // prints if sensor acknowledges
nemanja1994 0:d66d4aaa919f 29 if (!ch) console.printf("no ack\n");
nemanja1994 0:d66d4aaa919f 30 else console.printf("ack\n");
nemanja1994 0:d66d4aaa919f 31 // send EEPROM slave location address
nemanja1994 0:d66d4aaa919f 32 ch2 = i2c.write(0x2E);
nemanja1994 0:d66d4aaa919f 33 // send repeated start
nemanja1994 0:d66d4aaa919f 34 i2c.start();
nemanja1994 0:d66d4aaa919f 35 // send universal address 0x00 (seven bit) and use 1 as the eight bit -> 0x01
nemanja1994 0:d66d4aaa919f 36 i2c.write(0x01); // last bit 1 indicates read request
nemanja1994 0:d66d4aaa919f 37 // read LSB
nemanja1994 0:d66d4aaa919f 38 p1 = i2c.read(1);
nemanja1994 0:d66d4aaa919f 39 // read MSB
nemanja1994 0:d66d4aaa919f 40 p2 = i2c.read(1);
nemanja1994 0:d66d4aaa919f 41 // read PEC
nemanja1994 0:d66d4aaa919f 42 i2c.read(0);
nemanja1994 0:d66d4aaa919f 43 // release the bus
nemanja1994 0:d66d4aaa919f 44 i2c.stop();
nemanja1994 0:d66d4aaa919f 45 wait(0.1);
nemanja1994 0:d66d4aaa919f 46 // print hex
nemanja1994 0:d66d4aaa919f 47 console.printf("0x%x%x\nMSB 0x%x, LSB 0x%x\n", p2, p1, p2, p1);
nemanja1994 0:d66d4aaa919f 48 wait(10);
nemanja1994 0:d66d4aaa919f 49
nemanja1994 0:d66d4aaa919f 50
nemanja1994 0:d66d4aaa919f 51 // make sure i2c is inactive
nemanja1994 0:d66d4aaa919f 52 i2c.stop();
nemanja1994 0:d66d4aaa919f 53 wait(0.1);
nemanja1994 0:d66d4aaa919f 54 //send start bit
nemanja1994 0:d66d4aaa919f 55 i2c.start();
nemanja1994 0:d66d4aaa919f 56 // address the sensor using universal address 0x00 not its default 0x5A
nemanja1994 0:d66d4aaa919f 57 ch = i2c.write(0x00); // last bit 0 indicates write
nemanja1994 0:d66d4aaa919f 58 // prints if sensor acknowledges
nemanja1994 0:d66d4aaa919f 59 if (!ch) {
nemanja1994 0:d66d4aaa919f 60 console.printf("no ack\n");
nemanja1994 0:d66d4aaa919f 61 } else console.printf("ack 0x00\n");
nemanja1994 0:d66d4aaa919f 62 // write command
nemanja1994 0:d66d4aaa919f 63 // EEPROM address. Datasheet says 0x0E BUT!!! accessing EEPROM requires ading 0x20. Hence, 0x2E
nemanja1994 0:d66d4aaa919f 64 ch2 = i2c.write(0x2E);
nemanja1994 0:d66d4aaa919f 65 // prints if sensor acknowledges
nemanja1994 0:d66d4aaa919f 66 if (!ch2) console.printf("no ack address location\n");
nemanja1994 0:d66d4aaa919f 67 console.printf("ack 0x0E\n");
nemanja1994 0:d66d4aaa919f 68 // delete old address
nemanja1994 0:d66d4aaa919f 69 // LSB
nemanja1994 0:d66d4aaa919f 70 i2c.write(0x00);
nemanja1994 0:d66d4aaa919f 71 // MSB
nemanja1994 0:d66d4aaa919f 72 i2c.write(0x00);
nemanja1994 0:d66d4aaa919f 73 // use CRC-8 calculator to obtain PEC bit http://www.sunshine2k.de/coding/javascript/crc/crc_js.html
nemanja1994 0:d66d4aaa919f 74 // I send 2E0000 --> PEC 0x6F
nemanja1994 0:d66d4aaa919f 75 ch3 = i2c.write(0x6F);
nemanja1994 0:d66d4aaa919f 76 // prints if sensor acknowledges
nemanja1994 0:d66d4aaa919f 77 if(!ch3) console.printf("no PEC\n");
nemanja1994 0:d66d4aaa919f 78 else console.printf("PEC success\n");
nemanja1994 0:d66d4aaa919f 79 // release the bus
nemanja1994 0:d66d4aaa919f 80 i2c.stop();
nemanja1994 0:d66d4aaa919f 81 wait(1);
nemanja1994 0:d66d4aaa919f 82
nemanja1994 0:d66d4aaa919f 83 //-----set new address----------------
nemanja1994 0:d66d4aaa919f 84
nemanja1994 0:d66d4aaa919f 85 // send start bit
nemanja1994 0:d66d4aaa919f 86 i2c.start();
nemanja1994 0:d66d4aaa919f 87 // send universal device address 0x00
nemanja1994 0:d66d4aaa919f 88 i2c.write(0x00);
nemanja1994 0:d66d4aaa919f 89 // prints if sensor acknowledges
nemanja1994 0:d66d4aaa919f 90 if (!ch) console.printf("no ack\n");
nemanja1994 0:d66d4aaa919f 91 else console.printf("ack\n");
nemanja1994 0:d66d4aaa919f 92 // send EEPROM location for slave address
nemanja1994 0:d66d4aaa919f 93 ch2 = i2c.write(0x2E);
nemanja1994 0:d66d4aaa919f 94 // prints if sensor acknowledges
nemanja1994 0:d66d4aaa919f 95 if (!ch2) console.printf("no ack slave address location\n");
nemanja1994 0:d66d4aaa919f 96 else console.printf("ack 2\n");
nemanja1994 0:d66d4aaa919f 97 //write new address anything between 0x0000 and 0x007F (default 0x5A, PEC 0xE1)
nemanja1994 0:d66d4aaa919f 98 // LSB
nemanja1994 0:d66d4aaa919f 99 i2c.write(0x04);
nemanja1994 0:d66d4aaa919f 100 // MSB
nemanja1994 0:d66d4aaa919f 101 i2c.write(0x00);
nemanja1994 0:d66d4aaa919f 102 // send PEC calculated from CRC-8
nemanja1994 0:d66d4aaa919f 103 // I send 2E0400 -> PEC 0x3B
nemanja1994 0:d66d4aaa919f 104 i2c.write(0x3B);
nemanja1994 0:d66d4aaa919f 105 // release the bus
nemanja1994 0:d66d4aaa919f 106 i2c.stop();
nemanja1994 0:d66d4aaa919f 107 wait(1);
nemanja1994 0:d66d4aaa919f 108
nemanja1994 0:d66d4aaa919f 109 //----read address to make sure it worked------------
nemanja1994 0:d66d4aaa919f 110
nemanja1994 0:d66d4aaa919f 111 // send start bit
nemanja1994 0:d66d4aaa919f 112 i2c.start();
nemanja1994 0:d66d4aaa919f 113 // send universal address
nemanja1994 0:d66d4aaa919f 114 ch = i2c.write(0x00);
nemanja1994 0:d66d4aaa919f 115 // prints if sensor acknowledges
nemanja1994 0:d66d4aaa919f 116 if (!ch) console.printf("no ack\n");
nemanja1994 0:d66d4aaa919f 117 else console.printf("ack\n");
nemanja1994 0:d66d4aaa919f 118 // send EEPROM slave location address
nemanja1994 0:d66d4aaa919f 119 ch2 = i2c.write(0x2E);
nemanja1994 0:d66d4aaa919f 120 // send repeated start
nemanja1994 0:d66d4aaa919f 121 i2c.start();
nemanja1994 0:d66d4aaa919f 122 // send universal address 0x00 (seven bit) and use 1 as the eight bit -> 0x01
nemanja1994 0:d66d4aaa919f 123 i2c.write(0x01); // last bit 1 indicates read request
nemanja1994 0:d66d4aaa919f 124 // read LSB
nemanja1994 0:d66d4aaa919f 125 p1 = i2c.read(1);
nemanja1994 0:d66d4aaa919f 126 // read MSB
nemanja1994 0:d66d4aaa919f 127 p2 = i2c.read(1);
nemanja1994 0:d66d4aaa919f 128 // read PEC
nemanja1994 0:d66d4aaa919f 129 i2c.read(0);
nemanja1994 0:d66d4aaa919f 130 // release the bus
nemanja1994 0:d66d4aaa919f 131 i2c.stop();
nemanja1994 0:d66d4aaa919f 132 wait(0.1);
nemanja1994 0:d66d4aaa919f 133 // print hex
nemanja1994 0:d66d4aaa919f 134 console.printf("0x%x%x\nMSB 0x%x, LSB 0x%x\n", p2, p1, p2, p1);
nemanja1994 0:d66d4aaa919f 135 wait(10);
nemanja1994 0:d66d4aaa919f 136 }
nemanja1994 0:d66d4aaa919f 137
nemanja1994 0:d66d4aaa919f 138 int main()
nemanja1994 0:d66d4aaa919f 139 {
nemanja1994 0:d66d4aaa919f 140 console.printf("IrThermo Test\n");
nemanja1994 0:d66d4aaa919f 141 i2c.write(IrThermo_Addr, data_add, 1, 1);
nemanja1994 0:d66d4aaa919f 142 i2c.read(IrThermo_Addr, data_read, 2, 0);
nemanja1994 0:d66d4aaa919f 143 console.printf("Sensor Address: %x\n",data_read[0]);
nemanja1994 0:d66d4aaa919f 144 //changeAddress();
nemanja1994 0:d66d4aaa919f 145
nemanja1994 0:d66d4aaa919f 146 while(1) {
nemanja1994 0:d66d4aaa919f 147 i2c.write(IrThermo_Addr, data_write, 1, 1);
nemanja1994 0:d66d4aaa919f 148 i2c.read(IrThermo_Addr, data_read, 2, 0);
nemanja1994 0:d66d4aaa919f 149
nemanja1994 0:d66d4aaa919f 150 console.printf("Raw Data: %x %x\n",(data_read[0]), (data_read[1]));
nemanja1994 0:d66d4aaa919f 151 temperature = (int) ((int)data_read[1] << 8) | data_read[0];
nemanja1994 0:d66d4aaa919f 152 temperature = (temperature * 0.02 - 273.15);
nemanja1994 0:d66d4aaa919f 153 if (data_write[0]==Tamb) {
nemanja1994 0:d66d4aaa919f 154 console.printf("Ambient temperature= %d\n", temperature);
nemanja1994 0:d66d4aaa919f 155 } else {
nemanja1994 0:d66d4aaa919f 156 console.printf("Object temperature= %d\n", temperature);
nemanja1994 0:d66d4aaa919f 157 }
nemanja1994 0:d66d4aaa919f 158 myled = !myled;
nemanja1994 0:d66d4aaa919f 159 wait(1.0);
nemanja1994 0:d66d4aaa919f 160 }
nemanja1994 0:d66d4aaa919f 161
nemanja1994 0:d66d4aaa919f 162 }