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>

1 files changed, 21 insertions, 0 deletions

diff --git a/tools/iio/generic_buffer.c b/tools/iio/generic_buffer.c
index fc362d2ff983..0e737238ca74 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]);