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authorCorentin Le Gall <corentin.legall@iot.bzh>2019-11-14 19:13:25 +0100
committerRomain Forlot <romain.forlot@iot.bzh>2020-01-09 14:40:41 +0100
commit03a4775eefeeba913f69d331e3930700a567c4c5 (patch)
tree8ce29bfe16ac1804ddc920d95d2225469cc5800a /low-can-binding/utils/converter.cpp
parent9b17d0359dedbf92de95c1150f7e576d58e0331c (diff)
can: Add big endian CAN frame layout handle
- can-decoder.cpp: translate_signal() : Tests "frame_layout_is_little". If false the signal's bit position is changed to fit the layout. - message-definition.cpp: Added the new attribute "frame_layout_is_little" and its getter. - signals.cpp: Added a setter to the bit_position attribute. - converter.cpp: Added a methode to convert a big endian bit_position to a right (little endian) bit_position. Bug-AGL: SPEC-2988 Change-Id: I004c9069eb00f389564927cd12d1b30470c3a59d Signed-off-by: Corentin Le Gall <corentin.legall@iot.bzh> Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>
Diffstat (limited to 'low-can-binding/utils/converter.cpp')
-rw-r--r--low-can-binding/utils/converter.cpp30
1 files changed, 30 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));
+ }
+
+}