Messages in this thread Patch in this message | | | From | Irina Tirdea <> | Subject | [PATCH] iio: pressure: bmp280: fix temp compensation | Date | Wed, 8 Apr 2015 18:26:12 +0300 |
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Temperature reads on bmp280 device always return 0, due to a missing step in the compensation formula (data->tfine is never initialized).
Initialize data->tfine value so we get correct temperature and pressure values.
Signed-off-by: Irina Tirdea <irina.tirdea@intel.com> --- drivers/iio/pressure/bmp280.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/iio/pressure/bmp280.c b/drivers/iio/pressure/bmp280.c index 7c623e2..a2602d8 100644 --- a/drivers/iio/pressure/bmp280.c +++ b/drivers/iio/pressure/bmp280.c @@ -172,6 +172,7 @@ static s32 bmp280_compensate_temp(struct bmp280_data *data, var2 = (((((adc_temp >> 4) - ((s32)le16_to_cpu(buf[T1]))) * ((adc_temp >> 4) - ((s32)le16_to_cpu(buf[T1])))) >> 12) * ((s32)(s16)le16_to_cpu(buf[T3]))) >> 14; + data->t_fine = var1 + var2; return (data->t_fine * 5 + 128) >> 8; } -- 1.9.1
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