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@xxxxxxxxx>
---
v2: added the print1byte function to apply the channel shift and
address both signed and unsigned cases.
---
tools/iio/generic_buffer.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/tools/iio/generic_buffer.c b/tools/iio/generic_buffer.c
index fc362d2..0e73723 100644
--- a/tools/iio/generic_buffer.c
+++ b/tools/iio/generic_buffer.c
@@ -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]);
--
1.9.1
--
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