Driver for TI TMP007 thermopile. Reads object temperature, internal temperature, and sensor voltage.
tmp007.cpp@1:b11c53492ce5, 2014-10-29 (annotated)
- Committer:
- tomo21
- Date:
- Wed Oct 29 18:41:04 2014 +0000
- Revision:
- 1:b11c53492ce5
- Parent:
- 0:86a2044abd50
TMP007 Driver;
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
tomo21 | 0:86a2044abd50 | 1 | #include "mbed.h" |
tomo21 | 0:86a2044abd50 | 2 | |
tomo21 | 0:86a2044abd50 | 3 | #define TMP007_Voltage 0x00 |
tomo21 | 0:86a2044abd50 | 4 | #define TMP007_LocalTemp 0x01 |
tomo21 | 0:86a2044abd50 | 5 | #define TMP007_Conf 0x02 |
tomo21 | 0:86a2044abd50 | 6 | #define TMP007_ObjTemp 0x03 |
tomo21 | 0:86a2044abd50 | 7 | |
tomo21 | 0:86a2044abd50 | 8 | #define TMP007_ADDR 0x80 |
tomo21 | 0:86a2044abd50 | 9 | |
tomo21 | 0:86a2044abd50 | 10 | I2C i2c(PA_10, PA_9); |
tomo21 | 0:86a2044abd50 | 11 | |
tomo21 | 0:86a2044abd50 | 12 | //DigitalOut myled(LED1); |
tomo21 | 0:86a2044abd50 | 13 | |
tomo21 | 0:86a2044abd50 | 14 | Serial pc(PA_2, PA_3); |
tomo21 | 0:86a2044abd50 | 15 | |
tomo21 | 0:86a2044abd50 | 16 | int16_t temp_c, temp_c_2s, voltage_tot, voltage_h, voltage_2s, voltage_tot_a; |
tomo21 | 0:86a2044abd50 | 17 | float celsius, farenheit, voltage; |
tomo21 | 0:86a2044abd50 | 18 | char temp_write[3]; |
tomo21 | 0:86a2044abd50 | 19 | char temp_read[2]; |
tomo21 | 0:86a2044abd50 | 20 | uint8_t temp_h, temp_l, temp_h_and, voltage_l, voltage_h_and; |
tomo21 | 0:86a2044abd50 | 21 | int sign; |
tomo21 | 0:86a2044abd50 | 22 | |
tomo21 | 0:86a2044abd50 | 23 | //char TMP007_ObjTemp = 0x03; |
tomo21 | 0:86a2044abd50 | 24 | |
tomo21 | 0:86a2044abd50 | 25 | |
tomo21 | 0:86a2044abd50 | 26 | int main() |
tomo21 | 0:86a2044abd50 | 27 | { |
tomo21 | 0:86a2044abd50 | 28 | |
tomo21 | 0:86a2044abd50 | 29 | |
tomo21 | 0:86a2044abd50 | 30 | |
tomo21 | 0:86a2044abd50 | 31 | /* Configure the Temp Sensor: |
tomo21 | 0:86a2044abd50 | 32 | |
tomo21 | 0:86a2044abd50 | 33 | */ |
tomo21 | 0:86a2044abd50 | 34 | temp_write[0] = TMP007_Conf; |
tomo21 | 0:86a2044abd50 | 35 | temp_write[2] = 0x40; //Mode On, Alert, TC, 16 samples |
tomo21 | 1:b11c53492ce5 | 36 | temp_write[1] = 0x19; //check order of these (endianness) |
tomo21 | 0:86a2044abd50 | 37 | i2c.write(TMP007_ADDR, temp_write, 3, 0); |
tomo21 | 0:86a2044abd50 | 38 | |
tomo21 | 0:86a2044abd50 | 39 | while (1) { |
tomo21 | 0:86a2044abd50 | 40 | // Read Temp Sensor |
tomo21 | 0:86a2044abd50 | 41 | |
tomo21 | 0:86a2044abd50 | 42 | //Tell the temp sensor to take a one shot temperature measurement |
tomo21 | 0:86a2044abd50 | 43 | //temp_write[0] = LM75B_Conf; |
tomo21 | 0:86a2044abd50 | 44 | //temp_write[1] = 0x50; //One shot, low power mode |
tomo21 | 0:86a2044abd50 | 45 | //i2c.write(LM75B_ADDR, temp_write, 2, 0); |
tomo21 | 0:86a2044abd50 | 46 | |
tomo21 | 0:86a2044abd50 | 47 | //Read Temperature Register |
tomo21 | 0:86a2044abd50 | 48 | temp_write[0] = TMP007_ObjTemp; |
tomo21 | 0:86a2044abd50 | 49 | i2c.write(TMP007_ADDR, temp_write, 1, false); // no stop (unsure) |
tomo21 | 0:86a2044abd50 | 50 | i2c.read(TMP007_ADDR, temp_read, 2, 0); |
tomo21 | 0:86a2044abd50 | 51 | |
tomo21 | 0:86a2044abd50 | 52 | temp_h = temp_read[0]; |
tomo21 | 0:86a2044abd50 | 53 | temp_l = temp_read[1]; |
tomo21 | 0:86a2044abd50 | 54 | |
tomo21 | 0:86a2044abd50 | 55 | pc.printf("Object Temperature\n"); |
tomo21 | 0:86a2044abd50 | 56 | pc.printf("high bit = %x\n", temp_h); |
tomo21 | 0:86a2044abd50 | 57 | pc.printf("low bit = %x\n", temp_l); |
tomo21 | 0:86a2044abd50 | 58 | |
tomo21 | 0:86a2044abd50 | 59 | temp_c = ((temp_h) << 8) | temp_l; |
tomo21 | 0:86a2044abd50 | 60 | |
tomo21 | 0:86a2044abd50 | 61 | //int tempval = (int)((int)data_read[0] << 8) | data_read[1]; |
tomo21 | 0:86a2044abd50 | 62 | pc.printf("combined bit = %x\n", temp_c); |
tomo21 | 0:86a2044abd50 | 63 | temp_h_and = temp_h & 0x80; |
tomo21 | 0:86a2044abd50 | 64 | //check for negative number |
tomo21 | 0:86a2044abd50 | 65 | if (temp_h_and == 0x80) |
tomo21 | 0:86a2044abd50 | 66 | { |
tomo21 | 0:86a2044abd50 | 67 | |
tomo21 | 0:86a2044abd50 | 68 | //flip bits and add 1 |
tomo21 | 0:86a2044abd50 | 69 | temp_c_2s = temp_c ^ 0x7FFF + 0x04; |
tomo21 | 0:86a2044abd50 | 70 | //temp_c_shift = ((temp_c_2s)>>2); |
tomo21 | 0:86a2044abd50 | 71 | celsius = ((float)temp_c_2s * -0.25f) *.03125f; |
tomo21 | 0:86a2044abd50 | 72 | pc.printf("negative\n"); |
tomo21 | 0:86a2044abd50 | 73 | pc.printf("anded high bit = %x\n", temp_h_and); |
tomo21 | 0:86a2044abd50 | 74 | } |
tomo21 | 0:86a2044abd50 | 75 | else |
tomo21 | 0:86a2044abd50 | 76 | { |
tomo21 | 0:86a2044abd50 | 77 | //temp_c_shift = ((temp_c)>>2); |
tomo21 | 0:86a2044abd50 | 78 | //pc.printf("shifted bits: %x\n", temp_c_shift); |
tomo21 | 0:86a2044abd50 | 79 | celsius = ((float)temp_c * 0.25f) *.03125f; |
tomo21 | 0:86a2044abd50 | 80 | pc.printf("positive\n"); |
tomo21 | 0:86a2044abd50 | 81 | } |
tomo21 | 0:86a2044abd50 | 82 | pc.printf("Capsule Temperature is: %f C\n", celsius); |
tomo21 | 0:86a2044abd50 | 83 | farenheit = 1.8*celsius + 32; |
tomo21 | 0:86a2044abd50 | 84 | pc.printf("Capsule Temperature is: %f F\n\n", farenheit); |
tomo21 | 0:86a2044abd50 | 85 | |
tomo21 | 0:86a2044abd50 | 86 | //Read Internal Temperature Register |
tomo21 | 0:86a2044abd50 | 87 | temp_write[0] = TMP007_LocalTemp; |
tomo21 | 0:86a2044abd50 | 88 | i2c.write(TMP007_ADDR, temp_write, 1, false); // no stop (unsure) |
tomo21 | 0:86a2044abd50 | 89 | i2c.read(TMP007_ADDR, temp_read, 2, 0); |
tomo21 | 0:86a2044abd50 | 90 | |
tomo21 | 0:86a2044abd50 | 91 | temp_h = temp_read[0]; |
tomo21 | 0:86a2044abd50 | 92 | temp_l = temp_read[1]; |
tomo21 | 0:86a2044abd50 | 93 | |
tomo21 | 0:86a2044abd50 | 94 | pc.printf("Internal Temperature\n"); |
tomo21 | 0:86a2044abd50 | 95 | pc.printf("high bit = %x\n", temp_h); |
tomo21 | 0:86a2044abd50 | 96 | pc.printf("low bit = %x\n", temp_l); |
tomo21 | 0:86a2044abd50 | 97 | |
tomo21 | 0:86a2044abd50 | 98 | temp_c = ((temp_h) << 8) | temp_l; |
tomo21 | 0:86a2044abd50 | 99 | |
tomo21 | 0:86a2044abd50 | 100 | //int tempval = (int)((int)data_read[0] << 8) | data_read[1]; |
tomo21 | 0:86a2044abd50 | 101 | pc.printf("combined bit = %x\n", temp_c); |
tomo21 | 0:86a2044abd50 | 102 | temp_h_and = temp_h & 0x80; |
tomo21 | 0:86a2044abd50 | 103 | //check for negative number |
tomo21 | 0:86a2044abd50 | 104 | if (temp_h_and == 0x80) |
tomo21 | 0:86a2044abd50 | 105 | { |
tomo21 | 0:86a2044abd50 | 106 | |
tomo21 | 0:86a2044abd50 | 107 | //flip bits and add 1 |
tomo21 | 0:86a2044abd50 | 108 | temp_c_2s = temp_c ^ 0x7FFF + 0x04; |
tomo21 | 0:86a2044abd50 | 109 | //temp_c_shift = ((temp_c_2s)>>2); |
tomo21 | 0:86a2044abd50 | 110 | //scale |
tomo21 | 0:86a2044abd50 | 111 | celsius = ((float)temp_c_2s * -0.25f) *.03125f; |
tomo21 | 0:86a2044abd50 | 112 | pc.printf("negative\n"); |
tomo21 | 0:86a2044abd50 | 113 | //pc.printf("anded high bit = %x\n", temp_h_and); |
tomo21 | 0:86a2044abd50 | 114 | } |
tomo21 | 0:86a2044abd50 | 115 | else |
tomo21 | 0:86a2044abd50 | 116 | { |
tomo21 | 0:86a2044abd50 | 117 | //temp_c_shift = ((temp_c)>>2); |
tomo21 | 0:86a2044abd50 | 118 | //pc.printf("shifted bits: %x\n", temp_c_shift); |
tomo21 | 0:86a2044abd50 | 119 | //scale |
tomo21 | 0:86a2044abd50 | 120 | celsius = ((float)temp_c * 0.25f) *.03125f; |
tomo21 | 0:86a2044abd50 | 121 | pc.printf("positive\n"); |
tomo21 | 0:86a2044abd50 | 122 | } |
tomo21 | 0:86a2044abd50 | 123 | pc.printf("Internal Temperature is: %f C\n", celsius); |
tomo21 | 0:86a2044abd50 | 124 | farenheit = 1.8*celsius + 32; |
tomo21 | 0:86a2044abd50 | 125 | pc.printf("Internal Temperature is: %f F\n\n", farenheit); |
tomo21 | 0:86a2044abd50 | 126 | |
tomo21 | 0:86a2044abd50 | 127 | //Read Voltage Register |
tomo21 | 0:86a2044abd50 | 128 | temp_write[0] = TMP007_Voltage; |
tomo21 | 0:86a2044abd50 | 129 | i2c.write(TMP007_ADDR, temp_write, 1, false); // no stop (unsure) |
tomo21 | 0:86a2044abd50 | 130 | i2c.read(TMP007_ADDR, temp_read, 2, 0); |
tomo21 | 0:86a2044abd50 | 131 | |
tomo21 | 0:86a2044abd50 | 132 | voltage_h = temp_read[0]; |
tomo21 | 0:86a2044abd50 | 133 | voltage_l = temp_read[1]; |
tomo21 | 0:86a2044abd50 | 134 | |
tomo21 | 0:86a2044abd50 | 135 | pc.printf("Sensor Voltage\n"); |
tomo21 | 0:86a2044abd50 | 136 | pc.printf("high bit = %x\n", voltage_h); |
tomo21 | 0:86a2044abd50 | 137 | pc.printf("low bit = %x\n", voltage_l); |
tomo21 | 0:86a2044abd50 | 138 | |
tomo21 | 0:86a2044abd50 | 139 | voltage_tot = ((voltage_h) << 8) | voltage_l; |
tomo21 | 0:86a2044abd50 | 140 | voltage_tot_a = voltage_tot & 0x0000FFFF; |
tomo21 | 0:86a2044abd50 | 141 | |
tomo21 | 0:86a2044abd50 | 142 | //int tempval = (int)((int)data_read[0] << 8) | data_read[1]; |
tomo21 | 0:86a2044abd50 | 143 | pc.printf("combined bit = %x\n", voltage_tot_a); |
tomo21 | 0:86a2044abd50 | 144 | voltage_h_and = voltage_h & 0x80; |
tomo21 | 0:86a2044abd50 | 145 | //check for negative number |
tomo21 | 0:86a2044abd50 | 146 | if (voltage_h_and == 0x80) |
tomo21 | 0:86a2044abd50 | 147 | { |
tomo21 | 0:86a2044abd50 | 148 | |
tomo21 | 0:86a2044abd50 | 149 | //flip bits and add 1 |
tomo21 | 0:86a2044abd50 | 150 | //voltage_2s = voltage_tot ^ 0x7FFF + 0x01; |
tomo21 | 0:86a2044abd50 | 151 | voltage_2s = ~voltage_tot_a + 0x01; |
tomo21 | 0:86a2044abd50 | 152 | pc.printf("2's compliment conversion: %x\n", voltage_2s); |
tomo21 | 0:86a2044abd50 | 153 | //temp_c_shift = ((temp_c_2s)>>2); |
tomo21 | 0:86a2044abd50 | 154 | voltage = ((float)voltage_2s * -1.0f) *.00015625f; |
tomo21 | 0:86a2044abd50 | 155 | pc.printf("negative\n"); |
tomo21 | 0:86a2044abd50 | 156 | //pc.printf("anded high bit = %x\n", temp_h_and); |
tomo21 | 0:86a2044abd50 | 157 | } |
tomo21 | 0:86a2044abd50 | 158 | else |
tomo21 | 0:86a2044abd50 | 159 | { |
tomo21 | 0:86a2044abd50 | 160 | //temp_c_shift = ((temp_c)>>2); |
tomo21 | 0:86a2044abd50 | 161 | //pc.printf("shifted bits: %x\n", temp_c_shift); |
tomo21 | 0:86a2044abd50 | 162 | voltage = ((float)voltage_tot_a * 1.0f) *.00015625f; |
tomo21 | 0:86a2044abd50 | 163 | pc.printf("positive\n"); |
tomo21 | 0:86a2044abd50 | 164 | } |
tomo21 | 0:86a2044abd50 | 165 | pc.printf("Sensor Voltage is: %f mV\n\n\n", voltage); |
tomo21 | 0:86a2044abd50 | 166 | |
tomo21 | 0:86a2044abd50 | 167 | |
tomo21 | 0:86a2044abd50 | 168 | |
tomo21 | 0:86a2044abd50 | 169 | |
tomo21 | 0:86a2044abd50 | 170 | wait(4); |
tomo21 | 0:86a2044abd50 | 171 | } |
tomo21 | 0:86a2044abd50 | 172 | } |