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tools: iio: Add single-byte case for generic_buffer 

Some sensors export data in an 8-bit format.
Add a single-byte case for the generic_buffer tool so that
these sensors' buffer data can be visualized.

Signed-off-by: Tiberiu Breana <tiberiu.a.breana@intel.com>
Reviewed-by: Hartmut Knaack <knaack.h@gmx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Tiberiu Breana 2015-07-03 12:57:36 +03:00 committed by Jonathan Cameron
parent 12ebb05246
commit e8d0927a19
1 changed files with 21 additions and 0 deletions
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21
tools/iio/generic_buffer.c
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@ -61,6 +61,23 @@ int size_from_channelarray(struct iio_channel_info *channels, int num_channels)
return bytes;
}
void print1byte(uint8_t input, struct iio_channel_info *info)
{
/*
* Shift before conversion to avoid sign extension
* of left aligned data
*/
input >>= info->shift;
input &= info->mask;
if (info->is_signed) {
int8_t val = (int8_t)(input << (8 - info->bits_used)) >>
(8 - info->bits_used);
printf("%05f ", ((float)val + info->offset) * info->scale);
} else {
printf("%05f ", ((float)input + info->offset) * info->scale);
}
}
void print2byte(uint16_t input, struct iio_channel_info *info)
{
/* First swap if incorrect endian */
@ -152,6 +169,10 @@ void process_scan(char *data,
for (k = 0; k < num_channels; k++)
switch (channels[k].bytes) {
/* only a few cases implemented so far */
case 1:
print1byte(*(uint8_t *)(data + channels[k].location),
&channels[k]);
break;
case 2:
print2byte(*(uint16_t *)(data + channels[k].location),
&channels[k]);