diff options
Diffstat (limited to 'low-can-binding/utils')
| -rw-r--r-- | low-can-binding/utils/converter.cpp | 30 | ||||
| -rw-r--r-- | low-can-binding/utils/converter.hpp | 1 |
2 files changed, 31 insertions, 0 deletions
diff --git a/low-can-binding/utils/converter.cpp b/low-can-binding/utils/converter.cpp index e3db7f33..f790fc00 100644 --- a/low-can-binding/utils/converter.cpp +++ b/low-can-binding/utils/converter.cpp @@ -55,3 +55,33 @@ void converter_t::signal_to_bits_bytes(uint32_t bit_position, uint32_t bit_size, new_end_byte = (bit_position + bit_size - 1) >> 3; new_end_bit = (bit_position + bit_size - 1) % 8; } + + +/** + * @brief This is to use when you have a big endian CAN frame layout. + * It converts the bit position so it matches with little endiant CAN frame layout. + * + * @param bit_position Original bit position. + * @param bit_size Size of the data. + * @return uint32_t New little endian bit position. + */ +uint32_t converter_t::bit_position_swap(uint32_t bit_position,uint32_t bit_size) +{ + uint32_t start_byte_position = (uint32_t)(bit_position/8); + uint32_t bit_size_rest = bit_size; + if(bit_size<=8 && ((bit_position+bit_size)%8==bit_size || (bit_position+bit_size)%8==0)) + { + return (uint32_t)(start_byte_position*8 + (8-bit_size)); + } + else + { + do + { + bit_size_rest = bit_size_rest - ((start_byte_position+1)*8-bit_position); + start_byte_position--; + bit_position = start_byte_position*8; + } while (bit_size_rest>8); + return (uint32_t)(start_byte_position*8 + (8-bit_size_rest)); + } + +} diff --git a/low-can-binding/utils/converter.hpp b/low-can-binding/utils/converter.hpp index d24096a6..45233268 100644 --- a/low-can-binding/utils/converter.hpp +++ b/low-can-binding/utils/converter.hpp @@ -24,4 +24,5 @@ class converter_t public: static std::string to_hex(const uint8_t data[], const size_t length); static void signal_to_bits_bytes(uint32_t bit_position, uint32_t bit_size, int &new_start_byte, int &new_end_byte, uint8_t &new_start_bit, uint8_t &new_end_bit); + static uint32_t bit_position_swap(uint32_t bit_position,uint32_t bit_size); }; |