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authorRomain Forlot <romain.forlot@iot.bzh>2017-06-20 10:24:05 +0000
committerRomain Forlot <romain.forlot@iot.bzh>2017-06-20 10:24:05 +0000
commit32e25cbca210a359b09768537b6f443fe90a3070 (patch)
tree3309794c15d8a8f8e9c1c08cad072ee1378813ba /libs/bitfield-c/src/canutil/write.h
parent76c43dec62b2e21cd6446360c00d4fe6b437533f (diff)
Separation Generator to a dedicated repo
Change-Id: Id94831651c3266861435272a6e36c7884bef2c45 Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>
Diffstat (limited to 'libs/bitfield-c/src/canutil/write.h')
-rw-r--r--libs/bitfield-c/src/canutil/write.h57
1 files changed, 57 insertions, 0 deletions
diff --git a/libs/bitfield-c/src/canutil/write.h b/libs/bitfield-c/src/canutil/write.h
new file mode 100644
index 00000000..c2bef20e
--- /dev/null
+++ b/libs/bitfield-c/src/canutil/write.h
@@ -0,0 +1,57 @@
+#ifndef __WRITE_H__
+#define __WRITE_H__
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Public: Encode a floating point number into a fixed point, fixed bit width
+ * field in a bit array.
+ *
+ * value - the floating point value to encode.
+ * bit_offset - the starting point for the encoded bits in the returned value.
+ * bit_size - The max width of the field in the resulting bit array. If bit_size
+ * isn't big enough to store the fixed point version of the value, the
+ * bitfeld will *not* be set. TODO some error reporting would be nice.
+ * factor - a factor used to transform from floating to fixed point before
+ * encoding. Use 1.0 for no factor.
+ * offset - an offset used to transform from floating to fixed point before
+ * encoding. Use 0 for no offset.
+ *
+ * Returns a big-endian uint64_t with the value encoded as a bitfield.
+ */
+uint64_t eightbyte_encode_float(float value, uint8_t bit_offset,
+ uint8_t bit_size, float factor, float offset);
+
+uint64_t float_to_fixed_point(const float value, const float factor,
+ const float offset);
+
+bool bitfield_encode_float(const float value, const uint8_t bit_offset,
+ const uint8_t bit_size, const float factor, const float offset,
+ uint8_t destination[], const uint8_t destination_length);
+
+/* Public: Encode a boolean into fixed bit width field in a bit array.
+ *
+ * value - the boolean value to encode - true will be 1, false will be 0.
+ * bit_offset - the starting point for the encoded bits in the returned value.
+ * bit_size - The max width of the field in the resulting bit array. If bit_size
+ * isn't big enough to store the fixed point version of the value, the
+ * bitfeld will *not* be set. TODO some error reporting would be nice.
+ *
+ * Returns a big-endian uint64_t with the value encoded as a bitfield.
+ */
+uint64_t eightbyte_encode_bool(const bool value, const uint8_t bit_offset,
+ const uint8_t bit_size);
+
+bool bitfield_encode_bool(const bool value, const uint8_t bit_offset, const
+ uint8_t bit_size, uint8_t destination[],
+ const uint16_t destination_length);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __WRITE_H__