float adt7310_read_float(adt7310_t *dev)
{
int16_t raw = adt7310_read_raw(dev);
if (raw == INT16_MIN) {
return (0.0f / 0.0f); /* return NaN */
}
if (!dev->high_res) {
/* filter out the flag bits */
raw &= ADT7310_REG_VALUE_MASK_13BIT;
}
return (((float) raw) * ADT7310_TEMPERATURE_LSB_FLOAT);
}
int32_t adt7310_read(adt7310_t *dev)
{
int16_t raw = adt7310_read_raw(dev);
if (raw == INT16_MIN) {
return INT32_MIN;
}
if (!dev->high_res) {
/* filter out the flag bits */
raw &= ADT7310_REG_VALUE_MASK_13BIT;
}
return ((((int32_t)raw) * 1000) >> ADT7310_VALUE_FRAC_BITS);
}
float adt7310_read_float(const adt7310_t *dev)
{
int16_t raw = adt7310_read_raw(dev);
if (raw == INT16_MIN) {
/* cppcheck-suppress duplicateExpression
* (reason: we want to create a NaN here) */
return (0.0f / 0.0f); /* return NaN */
}
if (!dev->high_res) {
/* filter out the flag bits */
raw &= ADT7310_REG_VALUE_MASK_13BIT;
}
return (((float) raw) * ADT7310_TEMPERATURE_LSB_FLOAT);
}
int test_adt7310_sample_print(adt7310_t *dev)
{
int16_t raw;
float celsius_float;
int32_t millicelsius;
raw = adt7310_read_raw(dev);
if (raw == INT16_MIN) {
puts("Reading temperature data (adt7310_read_raw)... ");
puts("[Failed]\n");
return 1;
}
millicelsius = adt7310_read(dev);
if (millicelsius == INT32_MIN) {
puts("Reading temperature data (adt7310_read)... ");
puts("[Failed]\n");
return 1;
};
celsius_float = adt7310_read_float(dev);
if (isnan(celsius_float)) {
puts("Reading temperature data (adt7310_read_float)... ");
puts("[Failed]\n");
return 1;
};
/* Several platforms usually build with nano.specs, (without float printf) */
/* Split value into two integer parts for printing. */
float integral = 0;
float fractional;
fractional = modff(celsius_float, &integral);
printf("0x%04" PRIx16 " %7" PRId32 " mC %4d.%07u C)\n", raw, millicelsius,
(int)integral, abs(fractional * 10000000.f));
return 0;
}
