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aio.c: added normalized read returning a float in a 0.0-1.0 range

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Closes #32.

Signed-off-by: Alex Tereschenko <alext.mkrs@gmail.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Alex Tereschenko
2015-02-01 20:54:13 +01:00
committed by Brendan Le Foll
parent dbc64fbe86
commit cd6701d604
3 changed files with 30 additions and 0 deletions
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14
src/aio/aio.c
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@@ -159,6 +159,20 @@ mraa_aio_read(mraa_aio_context dev)
return analog_value;
}
float
mraa_aio_read_float(mraa_aio_context dev)
{
if (dev == NULL) {
syslog(LOG_ERR, "aio: Device not valid");
return 0.0;
}
float max_analog_value = (1 << dev->value_bit) - 1;
unsigned int analog_value_int = mraa_aio_read(dev);
return analog_value_int / max_analog_value;
}
mraa_result_t
mraa_aio_close(mraa_aio_context dev)
{