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driver/bmx280: increase accuracy of SAUL pressure readings

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The SAUL implementation of the BMx280 currently returns the pressure in hPa.
The sensor, however, actually reads the pressure in Pa, leading to a
significant loss of precision.

Because the operation range of the BME280 and BMP280 is 300 hPa to 1100 hPa,
we can safely increase the precision by a factor of 10 without risk of overflow.
The only downside is that readings are now presented as `e1 Pa` (eg 10206e1 Pa).
This commit is contained in:
Silke Hofstra 2021-03-03 16:18:27 +01:00
parent bf93d85d4e
commit 3ca1162a6a
1 changed files with 4 additions and 2 deletions
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6
drivers/bmx280/bmx280_saul.c
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@ -35,9 +35,11 @@ static int read_temperature(const void *dev, phydat_t *res)
static int read_pressure(const void *dev, phydat_t *res)
{
res->val[0] = bmx280_read_pressure((bmx280_t *)dev) / 100;
res->unit = UNIT_PA;
res->scale = 2;
res->scale = 0;
int32_t val = bmx280_read_pressure((bmx280_t *)dev);
phydat_fit(res, &val, 1);
return 1;
}