Library for TMPx75 Temperature Sensor
TMPx75.cpp@0:ba71558a5d0a, 2018-12-12 (annotated)
- Committer:
- jake123jake123
- Date:
- Wed Dec 12 21:48:42 2018 +0000
- Revision:
- 0:ba71558a5d0a
first commit;
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
jake123jake123 | 0:ba71558a5d0a | 1 | #include "TMPx75.h" |
jake123jake123 | 0:ba71558a5d0a | 2 | |
jake123jake123 | 0:ba71558a5d0a | 3 | // Constructor |
jake123jake123 | 0:ba71558a5d0a | 4 | TMPx75::TMPx75(I2C *i2c, uint8_t i2c_addr = 0x48) : pc(USBTX, USBRX) |
jake123jake123 | 0:ba71558a5d0a | 5 | { |
jake123jake123 | 0:ba71558a5d0a | 6 | _i2c = i2c; |
jake123jake123 | 0:ba71558a5d0a | 7 | _i2c_addr = i2c_addr; |
jake123jake123 | 0:ba71558a5d0a | 8 | pc.baud(115200); |
jake123jake123 | 0:ba71558a5d0a | 9 | } |
jake123jake123 | 0:ba71558a5d0a | 10 | |
jake123jake123 | 0:ba71558a5d0a | 11 | // Destructor |
jake123jake123 | 0:ba71558a5d0a | 12 | TMPx75::~TMPx75() |
jake123jake123 | 0:ba71558a5d0a | 13 | { |
jake123jake123 | 0:ba71558a5d0a | 14 | |
jake123jake123 | 0:ba71558a5d0a | 15 | } |
jake123jake123 | 0:ba71558a5d0a | 16 | |
jake123jake123 | 0:ba71558a5d0a | 17 | float TMPx75::read_temperature() |
jake123jake123 | 0:ba71558a5d0a | 18 | { |
jake123jake123 | 0:ba71558a5d0a | 19 | char data_write[1]; |
jake123jake123 | 0:ba71558a5d0a | 20 | data_write[0] = (TEMPERATURE_REGISTER); |
jake123jake123 | 0:ba71558a5d0a | 21 | char data_read[2]; |
jake123jake123 | 0:ba71558a5d0a | 22 | |
jake123jake123 | 0:ba71558a5d0a | 23 | _i2c->write((_i2c_addr<<1), data_write, 1, 1); // no stop |
jake123jake123 | 0:ba71558a5d0a | 24 | _i2c->read((_i2c_addr<<1), data_read, 2, 0); |
jake123jake123 | 0:ba71558a5d0a | 25 | |
jake123jake123 | 0:ba71558a5d0a | 26 | int tempval = (int)((int)data_read[0] << 8) | data_read[1]; |
jake123jake123 | 0:ba71558a5d0a | 27 | |
jake123jake123 | 0:ba71558a5d0a | 28 | tempval >>= 4; |
jake123jake123 | 0:ba71558a5d0a | 29 | if (tempval > 2048) |
jake123jake123 | 0:ba71558a5d0a | 30 | { |
jake123jake123 | 0:ba71558a5d0a | 31 | tempval = 4096 - tempval; |
jake123jake123 | 0:ba71558a5d0a | 32 | } |
jake123jake123 | 0:ba71558a5d0a | 33 | |
jake123jake123 | 0:ba71558a5d0a | 34 | float temp = (float)tempval/16; |
jake123jake123 | 0:ba71558a5d0a | 35 | |
jake123jake123 | 0:ba71558a5d0a | 36 | return temp; |
jake123jake123 | 0:ba71558a5d0a | 37 | } |
jake123jake123 | 0:ba71558a5d0a | 38 | |
jake123jake123 | 0:ba71558a5d0a | 39 | int TMPx75::read_configuration() |
jake123jake123 | 0:ba71558a5d0a | 40 | { |
jake123jake123 | 0:ba71558a5d0a | 41 | char data_write[1]; |
jake123jake123 | 0:ba71558a5d0a | 42 | data_write[0] = (CONFIGURATION_REGISTER); |
jake123jake123 | 0:ba71558a5d0a | 43 | char data_read[1]; |
jake123jake123 | 0:ba71558a5d0a | 44 | _i2c->write((_i2c_addr<<1), data_write, 1, 1); // no stop |
jake123jake123 | 0:ba71558a5d0a | 45 | _i2c->read((_i2c_addr<<1), data_read, 1, 0); |
jake123jake123 | 0:ba71558a5d0a | 46 | |
jake123jake123 | 0:ba71558a5d0a | 47 | return (int)data_read[0]; |
jake123jake123 | 0:ba71558a5d0a | 48 | } |
jake123jake123 | 0:ba71558a5d0a | 49 | |
jake123jake123 | 0:ba71558a5d0a | 50 | void TMPx75::write_configuration(uint8_t config_byte = DEFAULT_CONFIG) |
jake123jake123 | 0:ba71558a5d0a | 51 | { |
jake123jake123 | 0:ba71558a5d0a | 52 | char data_write[2]; |
jake123jake123 | 0:ba71558a5d0a | 53 | data_write[0] = (CONFIGURATION_REGISTER); |
jake123jake123 | 0:ba71558a5d0a | 54 | data_write[1] = (config_byte | DEFAULT_CONFIG); |
jake123jake123 | 0:ba71558a5d0a | 55 | _i2c->write((_i2c_addr<<1), data_write, 2, 0); |
jake123jake123 | 0:ba71558a5d0a | 56 | } |
jake123jake123 | 0:ba71558a5d0a | 57 | |
jake123jake123 | 0:ba71558a5d0a | 58 | float TMPx75::read_T_LOW() |
jake123jake123 | 0:ba71558a5d0a | 59 | { |
jake123jake123 | 0:ba71558a5d0a | 60 | char data_write[1]; |
jake123jake123 | 0:ba71558a5d0a | 61 | data_write[0] = (T_LOW_REGISTER); |
jake123jake123 | 0:ba71558a5d0a | 62 | char data_read[2]; |
jake123jake123 | 0:ba71558a5d0a | 63 | |
jake123jake123 | 0:ba71558a5d0a | 64 | _i2c->write((_i2c_addr<<1), data_write, 1, 1); // no stop |
jake123jake123 | 0:ba71558a5d0a | 65 | _i2c->read((_i2c_addr<<1), data_read, 2, 0); |
jake123jake123 | 0:ba71558a5d0a | 66 | |
jake123jake123 | 0:ba71558a5d0a | 67 | int temp = (int)((int)data_read[0] << 8) | data_read[1]; |
jake123jake123 | 0:ba71558a5d0a | 68 | temp >>= 4; |
jake123jake123 | 0:ba71558a5d0a | 69 | float t_low = (float)temp/16; |
jake123jake123 | 0:ba71558a5d0a | 70 | |
jake123jake123 | 0:ba71558a5d0a | 71 | return t_low; |
jake123jake123 | 0:ba71558a5d0a | 72 | } |
jake123jake123 | 0:ba71558a5d0a | 73 | |
jake123jake123 | 0:ba71558a5d0a | 74 | void TMPx75::write_T_LOW(float temp) |
jake123jake123 | 0:ba71558a5d0a | 75 | { |
jake123jake123 | 0:ba71558a5d0a | 76 | temp = temp * 16; |
jake123jake123 | 0:ba71558a5d0a | 77 | unsigned int u_temp = temp; |
jake123jake123 | 0:ba71558a5d0a | 78 | u_temp = u_temp << 4; |
jake123jake123 | 0:ba71558a5d0a | 79 | |
jake123jake123 | 0:ba71558a5d0a | 80 | char data_write[3]; |
jake123jake123 | 0:ba71558a5d0a | 81 | data_write[0] = (T_LOW_REGISTER); |
jake123jake123 | 0:ba71558a5d0a | 82 | data_write[1] = (u_temp>>8); |
jake123jake123 | 0:ba71558a5d0a | 83 | data_write[2] = (u_temp); |
jake123jake123 | 0:ba71558a5d0a | 84 | |
jake123jake123 | 0:ba71558a5d0a | 85 | _i2c->write((_i2c_addr<<1), data_write, 2, 0); |
jake123jake123 | 0:ba71558a5d0a | 86 | } |
jake123jake123 | 0:ba71558a5d0a | 87 | |
jake123jake123 | 0:ba71558a5d0a | 88 | float TMPx75::read_T_HIGH() |
jake123jake123 | 0:ba71558a5d0a | 89 | { |
jake123jake123 | 0:ba71558a5d0a | 90 | char data_write[1]; |
jake123jake123 | 0:ba71558a5d0a | 91 | data_write[0] = (T_HIGH_REGISTER); |
jake123jake123 | 0:ba71558a5d0a | 92 | char data_read[2]; |
jake123jake123 | 0:ba71558a5d0a | 93 | |
jake123jake123 | 0:ba71558a5d0a | 94 | _i2c->write((_i2c_addr<<1), data_write, 1, 1); // no stop |
jake123jake123 | 0:ba71558a5d0a | 95 | _i2c->read((_i2c_addr<<1), data_read, 2, 0); |
jake123jake123 | 0:ba71558a5d0a | 96 | |
jake123jake123 | 0:ba71558a5d0a | 97 | int temp = (int)((int)data_read[0] << 8) | data_read[1]; |
jake123jake123 | 0:ba71558a5d0a | 98 | temp >>= 4; |
jake123jake123 | 0:ba71558a5d0a | 99 | float t_high = (float)temp/16; |
jake123jake123 | 0:ba71558a5d0a | 100 | |
jake123jake123 | 0:ba71558a5d0a | 101 | return t_high; |
jake123jake123 | 0:ba71558a5d0a | 102 | } |
jake123jake123 | 0:ba71558a5d0a | 103 | |
jake123jake123 | 0:ba71558a5d0a | 104 | void TMPx75::write_T_HIGH(float temp) |
jake123jake123 | 0:ba71558a5d0a | 105 | { |
jake123jake123 | 0:ba71558a5d0a | 106 | temp = temp * 16; |
jake123jake123 | 0:ba71558a5d0a | 107 | unsigned int u_temp = temp; |
jake123jake123 | 0:ba71558a5d0a | 108 | u_temp = u_temp << 4; |
jake123jake123 | 0:ba71558a5d0a | 109 | |
jake123jake123 | 0:ba71558a5d0a | 110 | char data_write[3]; |
jake123jake123 | 0:ba71558a5d0a | 111 | data_write[0] = (T_HIGH_REGISTER); |
jake123jake123 | 0:ba71558a5d0a | 112 | data_write[1] = (u_temp>>8); |
jake123jake123 | 0:ba71558a5d0a | 113 | data_write[2] = (u_temp); |
jake123jake123 | 0:ba71558a5d0a | 114 | |
jake123jake123 | 0:ba71558a5d0a | 115 | _i2c->write((_i2c_addr<<1), data_write, 2, 0); |
jake123jake123 | 0:ba71558a5d0a | 116 | } |