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iio: tools: Add support for floating-point types in buffer scan elements

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A subsequent commit will add floating-point support to the ABI; enhance
the iio_generic_buffer tool to be able to parse this new data format.

Signed-off-by: Francesco Lavra <flavra@baylibre.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Francesco Lavra
2026-04-27 09:58:16 +01:00
committed by Jonathan Cameron
parent fda05af070
commit cdd445d4b2
3 changed files with 70 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tools/iio/iio_generic_buffer.c
+62 -8
View File
@@ -26,6 +26,7 @@
#include <string.h>
#include <poll.h>
#include <endian.h>
#include <float.h>
#include <getopt.h>
#include <inttypes.h>
#include <stdbool.h>
@@ -89,12 +90,19 @@ static void print1byte(uint8_t input, struct iio_channel_info *info)
*/
input >>= info->shift;
input &= info->mask;
if (info->is_signed) {
switch (info->format) {
case 's': {
int8_t val = (int8_t)(input << (8 - info->bits_used)) >>
(8 - info->bits_used);
printf("%05f ", ((float)val + info->offset) * info->scale);
} else {
break;
}
case 'u':
printf("%05f ", ((float)input + info->offset) * info->scale);
break;
case 'f':
printf("<invalid 1-byte float> ");
break;
}
}
@@ -112,12 +120,30 @@ static void print2byte(uint16_t input, struct iio_channel_info *info)
*/
input >>= info->shift;
input &= info->mask;
if (info->is_signed) {
switch (info->format) {
case 's': {
int16_t val = (int16_t)(input << (16 - info->bits_used)) >>
(16 - info->bits_used);
printf("%05f ", ((float)val + info->offset) * info->scale);
} else {
break;
}
case 'u':
printf("%05f ", ((float)input + info->offset) * info->scale);
break;
case 'f': {
#if defined(__FLT16_MAX__)
union {
uint16_t u;
_Float16 f;
} converter;
converter.u = input;
printf("%05f ", ((float)converter.f + info->offset) * info->scale);
#else
printf("<unsupported 2-byte float> ");
#endif
break;
}
}
}
@@ -135,12 +161,26 @@ static void print4byte(uint32_t input, struct iio_channel_info *info)
*/
input >>= info->shift;
input &= info->mask;
if (info->is_signed) {
switch (info->format) {
case 's': {
int32_t val = (int32_t)(input << (32 - info->bits_used)) >>
(32 - info->bits_used);
printf("%05f ", ((float)val + info->offset) * info->scale);
} else {
break;
}
case 'u':
printf("%05f ", ((float)input + info->offset) * info->scale);
break;
case 'f': {
union {
uint32_t u;
float f;
} converter;
converter.u = input;
printf("%05f ", (converter.f + info->offset) * info->scale);
break;
}
}
}
@@ -158,7 +198,8 @@ static void print8byte(uint64_t input, struct iio_channel_info *info)
*/
input >>= info->shift;
input &= info->mask;
if (info->is_signed) {
switch (info->format) {
case 's': {
int64_t val = (int64_t)(input << (64 - info->bits_used)) >>
(64 - info->bits_used);
/* special case for timestamp */
@@ -167,8 +208,21 @@ static void print8byte(uint64_t input, struct iio_channel_info *info)
else
printf("%05f ",
((float)val + info->offset) * info->scale);
} else {
break;
}
case 'u':
printf("%05f ", ((float)input + info->offset) * info->scale);
break;
case 'f': {
union {
uint64_t u;
double f;
} converter;
converter.u = input;
printf("%05f ", (converter.f + info->offset) * info->scale);
break;
}
}
}
tools/iio/iio_utils.c
+6 -6
View File
@@ -70,7 +70,7 @@ int iioutils_break_up_name(const char *full_name, char **generic_name)
/**
* iioutils_get_type() - find and process _type attribute data
* @is_signed: output whether channel is signed
* @format: output channel format
* @bytes: output how many bytes the channel storage occupies
* @bits_used: output number of valid bits of data
* @shift: output amount of bits to shift right data before applying bit mask
@@ -83,7 +83,7 @@ int iioutils_break_up_name(const char *full_name, char **generic_name)
*
* Returns a value >= 0 on success, otherwise a negative error code.
**/
static int iioutils_get_type(unsigned int *is_signed, unsigned int *bytes,
static int iioutils_get_type(char *format, unsigned int *bytes,
unsigned int *bits_used, unsigned int *shift,
uint64_t *mask, unsigned int *be,
const char *device_dir, int buffer_idx,
@@ -93,7 +93,7 @@ static int iioutils_get_type(unsigned int *is_signed, unsigned int *bytes,
int ret;
DIR *dp;
char *scan_el_dir, *builtname, *builtname_generic, *filename = 0;
char signchar, endianchar;
char formatchar, endianchar;
unsigned padint;
const struct dirent *ent;
@@ -140,7 +140,7 @@ static int iioutils_get_type(unsigned int *is_signed, unsigned int *bytes,
ret = fscanf(sysfsfp,
"%ce:%c%u/%u>>%u",
&endianchar,
&signchar,
&formatchar,
bits_used,
&padint, shift);
if (ret < 0) {
@@ -162,7 +162,7 @@ static int iioutils_get_type(unsigned int *is_signed, unsigned int *bytes,
else
*mask = (1ULL << *bits_used) - 1ULL;
*is_signed = (signchar == 's');
*format = formatchar;
if (fclose(sysfsfp)) {
ret = -errno;
fprintf(stderr, "Failed to close %s\n",
@@ -487,7 +487,7 @@ int build_channel_array(const char *device_dir, int buffer_idx,
if ((ret < 0) && (ret != -ENOENT))
goto error_cleanup_array;
ret = iioutils_get_type(&current->is_signed,
ret = iioutils_get_type(&current->format,
&current->bytes,
&current->bits_used,
&current->shift,
tools/iio/iio_utils.h
+2 -2
View File
@@ -32,7 +32,7 @@ extern const char *iio_dir;
* @shift: amount of bits to shift right data before applying bit mask
* @mask: a bit mask for the raw output
* @be: flag if data is big endian
* @is_signed: is the raw value stored signed
* @format: format of the raw value
* @location: data offset for this channel inside the buffer (in bytes)
**/
struct iio_channel_info {
@@ -46,7 +46,7 @@ struct iio_channel_info {
unsigned shift;
uint64_t mask;
unsigned be;
unsigned is_signed;
char format;
unsigned location;
};