aboutsummaryrefslogtreecommitdiffstats
path: root/low-can-binding/utils
diff options
context:
space:
mode:
Diffstat (limited to 'low-can-binding/utils')
-rw-r--r--low-can-binding/utils/converter.cpp30
-rw-r--r--low-can-binding/utils/converter.hpp1
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);
};