embeddedFinal/Si7021.cpp at master · rlopezv/embeddedFinal · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
#include "Si7021.h"

Si7021::Si7021(PinName sda, PinName scl):i2c(sda, scl)
{
    i2c.frequency(FREQ);
}

Si7021::~Si7021()
{

}

int32_t Si7021::get_temperature()
{
    return tData;
}

uint32_t Si7021::get_humidity()
{
    return rhData;
}

bool Si7021::measure()
{
    tx_buff[0] = READ_RH;
    if(i2c.write(ADDR, (char*)tx_buff, 1) != 0) return 0;
    if(i2c.read(ADDR, (char*)rx_buff, 2) != 0) return 0;

    rhData = ((uint32_t)rx_buff[0] << 8) + (rx_buff[1]);
    rhData = (((rhData) * 125/65536)) - 6;

    tx_buff[0] = READ_TEMP;
    if(i2c.write(ADDR, (char*)tx_buff, 1) != 0) return 0;
    if(i2c.read(ADDR, (char*)rx_buff, 2) != 0) return 0;

    tData = ((uint32_t)rx_buff[0] << 8) + (rx_buff[1]);
    tData = (((tData) * 175.72/65536)) - 46.85;

    return 1;
}

bool Si7021::check()
{
    tx_buff[0] = READ_ID2_1;
    tx_buff[1] = READ_ID2_2;
    if(i2c.write(ADDR, (char*)tx_buff, 2) != 0) return 0;
    if(i2c.read(ADDR, (char*)rx_buff, 8) != 0) return 0;

    if(rx_buff[0] == DEVICE_ID)
        return true;
    else return 0;
}