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| author |   Ladislav Michl <ladis@linux-mips.org> | 2017-08-25 07:39:16 +0200 |
|---|---|---|
| committer |   Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2017-09-03 18:10:31 +0100 |
| commit | fe895ac88b9fbdf2026f0bfd56c82747bb9d7c48 (patch) | |
| tree | a79d63def40b36d421b6b8d7d44d0802802bee8f /drivers/iio/adc/ti-ads1015.c | |
| parent | iio: adc: ti-ads1015: write config register only on change (diff) | |
| download | linux-dev-fe895ac88b9fbdf2026f0bfd56c82747bb9d7c48.tar.xz linux-dev-fe895ac88b9fbdf2026f0bfd56c82747bb9d7c48.zip | |
iio: adc: ti-ads1015: add 10% to conversion wait time
As user's guide "ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, ADS1115EVM-PDK
User Guide (Rev. B)" (http://www.ti.com/lit/ug/sbau157b/sbau157b.pdf)
states at page 16:
"Note that both the ADS1115 and ADS1015 have internal clocks with a ±10%
accuracy. If performing FFT tests, frequencies may appear to be incorrect
as a result of this tolerance range.", add those 10% to converion wait
time.
Cc: Daniel Baluta <daniel.baluta@gmail.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Reviewed-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/adc/ti-ads1015.c')
| -rw-r--r-- | drivers/iio/adc/ti-ads1015.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c index 7503ea56b781..3e9719e8cf3b 100644 --- a/drivers/iio/adc/ti-ads1015.c +++ b/drivers/iio/adc/ti-ads1015.c @@ -368,6 +368,7 @@ int ads1015_get_adc_result(struct ads1015_data *data, int chan, int *val) dr_old = (old & ADS1015_CFG_DR_MASK) >> ADS1015_CFG_DR_SHIFT; conv_time = DIV_ROUND_UP(USEC_PER_SEC, data->data_rate[dr_old]); conv_time += DIV_ROUND_UP(USEC_PER_SEC, data->data_rate[dr]); + conv_time += conv_time / 10; /* 10% internal clock inaccuracy */ usleep_range(conv_time, conv_time + 1); data->conv_invalid = false; } |