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-rw-r--r--libs/bitfield-c/src/canutil/write.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/libs/bitfield-c/src/canutil/write.c b/libs/bitfield-c/src/canutil/write.c
new file mode 100644
index 0000000..7f3a3e0
--- /dev/null
+++ b/libs/bitfield-c/src/canutil/write.c
@@ -0,0 +1,48 @@
+#include <canutil/write.h>
+#include <bitfield/bitfield.h>
+#include <bitfield/8byte.h>
+
+uint64_t float_to_fixed_point(const float value, const float factor,
+ const float offset) {
+ float raw = (value - offset) / factor;
+ if(raw > 0) {
+ // round up to avoid losing precision when we cast to an int
+ // TODO do we need a way to encode an int back to a signal without any
+ // rounding?
+ raw += 0.5;
+ }
+ return (uint64_t)raw;
+}
+
+uint64_t eightbyte_encode_float(float value, uint8_t bit_offset, uint8_t bit_size,
+ float factor, float offset) {
+ uint64_t result = 0;
+ if(!eightbyte_set_bitfield(float_to_fixed_point(value, factor, offset),
+ bit_offset, bit_size, &result)) {
+ // debug("%f will not fit in a %d bit field", value, bit_size);
+ }
+ return result;
+}
+
+uint64_t eightbyte_encode_bool(const bool value, const uint8_t bit_offset,
+ const uint8_t bit_size) {
+ return eightbyte_encode_float(value, bit_offset, bit_size, 1.0, 0);
+}
+
+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) {
+ if(!set_bitfield(float_to_fixed_point(value, factor, offset), bit_offset,
+ bit_size, destination, destination_length)) {
+ // debug("%f will not fit in a %d bit field", value, bit_size);
+ return false;
+ }
+ return true;
+}
+
+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) {
+ return bitfield_encode_float(value, bit_offset, bit_size, 1.0, 0,
+ destination, destination_length);
+}