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drivers/sensor: lps22hh: Fix the raw to kPa sample conversion

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The lps22hh 24 bit raw sample is left aligned, which means that
it needs to be right-shifted by 8 before applying conversion.
Moreover the conversion has been simplified for clarity.

Fix #35871

Signed-off-by: Armando Visconti <armando.visconti@st.com>
This commit is contained in:
Armando Visconti 2021-06-03 11:43:12 +02:00 • committed by Kumar Gala
commit 4e8c809d74
1 changed files with 6 additions and 4 deletions
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10
drivers/sensor/lps22hh/lps22hh.c
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@ -56,11 +56,13 @@ static int lps22hh_sample_fetch(const struct device *dev,
static inline void lps22hh_press_convert(struct sensor_value *val,
int32_t raw_val)
{
int32_t press_tmp = raw_val >> 8; /* raw value is left aligned (24 msb) */
/* Pressure sensitivity is 4096 LSB/hPa */
/* Convert raw_val to val in kPa */
val->val1 = (raw_val >> 12) / 10;
val->val2 = (raw_val >> 12) % 10 * 100000 +
(((int32_t)((raw_val) & 0x0FFF) * 100000L) >> 12);
/* Also convert hPa into kPa */
val->val1 = press_tmp / 40960;
val->val2 = (press_tmp % 40960) * 1000000 / 40960;
}
static inline void lps22hh_temp_convert(struct sensor_value *val,