diff options
Diffstat (limited to 'low-can-binding/utils')
| -rw-r--r-- | low-can-binding/utils/converter.cpp | 50 | ||||
| -rw-r--r-- | low-can-binding/utils/converter.hpp | 3 |
2 files changed, 23 insertions, 30 deletions
diff --git a/low-can-binding/utils/converter.cpp b/low-can-binding/utils/converter.cpp index 6392fbdf..c6c2f5e1 100644 --- a/low-can-binding/utils/converter.cpp +++ b/low-can-binding/utils/converter.cpp @@ -19,6 +19,7 @@ #include <sstream> #include <net/if.h> #include <afb/afb-binding> +#include <climits> /** * @brief Convert hex data to string @@ -51,9 +52,9 @@ std::string converter_t::to_hex(const uint8_t data[], const size_t length) void converter_t::signal_to_bits_bytes(unsigned int bit_position, unsigned int bit_size, int &new_start_byte, int &new_end_byte, uint8_t &new_start_bit, uint8_t &new_end_bit) { new_start_byte = bit_position >> 3; - new_start_bit = bit_position % 8; + new_start_bit = bit_position % CHAR_BIT; new_end_byte = (bit_position + bit_size - 1) >> 3; - new_end_bit = (bit_position + bit_size - 1) % 8; + new_end_bit = (bit_position + bit_size - 1) % CHAR_BIT; } @@ -61,38 +62,27 @@ void converter_t::signal_to_bits_bytes(unsigned int bit_position, unsigned int b * @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 msg_length Message length in bytes. * @param bit_position Original bit position. - * @param bit_size Size of the data. + * @param bit_size Size of the data. * @return uint32_t New bit position. */ uint32_t converter_t::bit_position_swap(unsigned int msg_length, unsigned int bit_position, unsigned int bit_size) { - return msg_length - bit_position - bit_size; - /* - unsigned int start_byte_position = (unsigned int)(bit_position/8); - unsigned int bit_size_rest = bit_size; - - if((int)(bit_size-(8 + start_byte_position * 8 - bit_position % 8)) > 0) - { - AFB_ERROR("Error: bit_position and bit_size getting out of range"); - return bit_position; - } + return (msg_length * CHAR_BIT) - bit_position - bit_size; +} - if(bit_size <= 8 && - ((bit_position+bit_size) % 8 == bit_size || - (bit_position+bit_size)%8==0)) - { - return (unsigned int)(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 (unsigned int)(start_byte_position*8 + (8-bit_size_rest)); - } - */ +/** + * @brief This allow to get the correct bit_position using the weird Continental. + * bit numbering method where the Frame is read using little endianness + * and bit count using a big endianness + * + * @param msg_length Message length in bytes. + * @param bit_position Original bit position. + * @param bit_size Size of the data. + * @return uint32_t New bit position. + */ +uint32_t converter_t::continental_bit_position_mess(unsigned int msg_length, unsigned int bit_position, unsigned int bit_size) +{ + return bit_position + (CHAR_BIT - bit_position % CHAR_BIT) - bit_size; } diff --git a/low-can-binding/utils/converter.hpp b/low-can-binding/utils/converter.hpp index 23f8ae77..45e29e9a 100644 --- a/low-can-binding/utils/converter.hpp +++ b/low-can-binding/utils/converter.hpp @@ -32,4 +32,7 @@ class converter_t static uint32_t bit_position_swap(unsigned int msg_length, unsigned int bit_position, unsigned int bit_size); + static uint32_t continental_bit_position_mess(unsigned int msg_length, + unsigned int bit_position, + unsigned int bit_size); }; |