blob: 7acc8c66898f4883df73473848c0540b2270e104 (
plain)
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
|
/**
* TMP75 is most simple I2C device in our case. It is already useful with
* default settings after powerup.
* You only must read 2 sequential bytes from it.
*/
#include <stdlib.h>
#include "ch.h"
#include "hal.h"
#include "tmp75.h"
/* input buffer */
static uint8_t tmp75_rx_data[TMP75_RX_DEPTH];
/* temperature value */
static int16_t temperature = 0;
#define tmp75_addr 0b1001000
/* This is main function. */
void request_temperature(void){
int16_t t_int = 0, t_frac = 0;
i2cAcquireBus(&I2CD1);
i2cMasterReceive(&I2CD1, tmp75_addr, tmp75_rx_data, 2);
i2cReleaseBus(&I2CD1);
t_int = tmp75_rx_data[0] * 100;
t_frac = (tmp75_rx_data[1] * 100) >> 8;
temperature = t_int + t_frac;
}
|
