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#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);
}
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