diff options
Diffstat (limited to 'src/can/can-decoder.cpp')
| -rw-r--r-- | src/can/can-decoder.cpp | 120 |
1 files changed, 115 insertions, 5 deletions
diff --git a/src/can/can-decoder.cpp b/src/can/can-decoder.cpp index a5e4d8ee..ec31e367 100644 --- a/src/can/can-decoder.cpp +++ b/src/can/can-decoder.cpp @@ -19,6 +19,15 @@ #include "canutil/read.h" #include "../utils/openxc-utils.hpp" +/* Public: Parse the signal's bitfield from the given data and return the raw +* value. +* +* @param[in] signal - The signal to parse from the data. +* @param[in] message - can_message_t to parse +* +* @return Returns the raw value of the signal parsed as a bitfield from the given byte +* array. +*/ float decoder_t::parseSignalBitfield(can_signal_t& signal, const can_message_t& message) { return bitfield_parse_float(message.get_data(), CAN_MESSAGE_SIZE, @@ -26,6 +35,21 @@ float decoder_t::parseSignalBitfield(can_signal_t& signal, const can_message_t& signal.get_offset()); } +/* Public: Wrap a raw CAN signal value in a DynamicField without modification. +* +* This is an implementation of the SignalDecoder type signature, and can be +* used directly in the can_signal_t.decoder field. +* +* @param[in] signal - The details of the signal that contains the state mapping. +* @param[in] signals - The list of all signals +* @param[in] value - The numerical value that will be wrapped in a DynamicField. +* @param[out]send - An output argument that will be set to false if the value should +* not be sent for any reason. +* +* @return Returns a DynamicField with the original, unmodified raw CAN signal value as +* its numeric value. The 'send' argument will not be modified as this decoder +* always succeeds. +*/ openxc_DynamicField decoder_t::noopDecoder(can_signal_t& signal, const std::vector<can_signal_t>& signals, float value, bool* send) { @@ -33,7 +57,21 @@ openxc_DynamicField decoder_t::noopDecoder(can_signal_t& signal, return decoded_value; } - +/* Public: Coerces a numerical value to a boolean. +* +* This is an implementation of the SignalDecoder type signature, and can be +* used directly in the can_signal_t.decoder field. +* +* @param[in] signal - The details of the signal that contains the state mapping. +* @param[in] signals - The list of all signals +* @param[in] value - The numerical value that will be converted to a boolean. +* @param[out] send - An output argument that will be set to false if the value should +* not be sent for any reason. +* +* @return Returns a DynamicField with a boolean value of false if the raw signal value +* is 0.0, otherwise true. The 'send' argument will not be modified as this +* decoder always succeeds. +*/ openxc_DynamicField decoder_t::booleanDecoder(can_signal_t& signal, const std::vector<can_signal_t>& signals, float value, bool* send) { @@ -41,18 +79,48 @@ openxc_DynamicField decoder_t::booleanDecoder(can_signal_t& signal, return decoded_value; } - +/* Public: Update the metadata for a signal and the newly received value. +* +* This is an implementation of the SignalDecoder type signature, and can be +* used directly in the can_signal_t.decoder field. +* +* This function always flips 'send' to false. +* +* @param[in] signal - The details of the signal that contains the state mapping. +* @param[in] signals - The list of all signals. +* @param[in] value - The numerical value that will be converted to a boolean. +* @param[out] send - This output argument will always be set to false, so the caller will +* know not to publish this value to the pipeline. +* +* @return Return value is undefined. +*/ openxc_DynamicField decoder_t::ignoreDecoder(can_signal_t& signal, const std::vector<can_signal_t>& signals, float value, bool* send) { if(send) *send = false; - - openxc_DynamicField decoded_value = {0, openxc_DynamicField_Type_BOOL, 0, "", 0, 0, 0, 0}; - + + openxc_DynamicField decoded_value; + return decoded_value; } +/* Public: Find and return the corresponding string state for a CAN signal's +* raw integer value. +* +* This is an implementation of the SignalDecoder type signature, and can be +* used directly in the can_signal_t.decoder field. +* +* @param[in] signal - The details of the signal that contains the state mapping. +* @param[in] signals - The list of all signals. +* @param[in] value - The numerical value that should map to a state. +* @param[out] send - An output argument that will be set to false if the value should +* not be sent for any reason. +* +* @return Returns a DynamicField with a string value if a matching state is found in +* the signal. If an equivalent isn't found, send is sent to false and the +* return value is undefined. +*/ openxc_DynamicField decoder_t::stateDecoder(can_signal_t& signal, const std::vector<can_signal_t>& signals, float value, bool* send) { @@ -66,6 +134,20 @@ openxc_DynamicField decoder_t::stateDecoder(can_signal_t& signal, return decoded_value; } + +/* Public: Parse a signal from a CAN message, apply any required transforations +* to get a human readable value and public the result to the pipeline. +* +* If the can_signal_t has a non-NULL 'decoder' field, the raw CAN signal value +* will be passed to the decoder before publishing. +* +* @param[in] signal - The details of the signal to decode and forward. +* @param[in] message - The received CAN message that should contain this signal. +* @param[in] signals - an array of all active signals. +* +* The decoder returns an openxc_DynamicField, which may contain a number, +* string or boolean. +*/ openxc_DynamicField decoder_t::translateSignal(can_signal_t& signal, can_message_t& message, const std::vector<can_signal_t>& signals) { @@ -89,6 +171,21 @@ openxc_DynamicField decoder_t::translateSignal(can_signal_t& signal, can_message return decoded_value; } +/* Public: Parse a signal from a CAN message and apply any required +* transforations to get a human readable value. +* +* If the can_signal_t has a non-NULL 'decoder' field, the raw CAN signal value +* will be passed to the decoder before returning. +* +* @param[in] signal - The details of the signal to decode and forward. +* @param[in] value - The numerical value that will be converted to a boolean. +* @param[in] signals - an array of all active signals. +* @param[out] send - An output parameter that will be flipped to false if the value could +* not be decoded. +* +* @return The decoder returns an openxc_DynamicField, which may contain a number, +* string or boolean. If 'send' is false, the return value is undefined. +*/ openxc_DynamicField decoder_t::decodeSignal( can_signal_t& signal, float value, const std::vector<can_signal_t>& signals, bool* send) { @@ -99,6 +196,19 @@ openxc_DynamicField decoder_t::decodeSignal( can_signal_t& signal, return decoded_value; } +/* Public: Decode a transformed, human readable value from an raw CAN signal +* already parsed from a CAN message. +* +* This is the same as decodeSignal but you must parse the bitfield value of the signal from the CAN +* message yourself. This is useful if you need that raw value for something +* else. +* +* @param[in] signal - The details of the signal to decode and forward. +* @param[in] value - The numerical value that will be converted to a boolean. +* @param[in] signals - an array of all active signals. +* @param[out] send - An output parameter that will be flipped to false if the value could +* not be decoded. +*/ openxc_DynamicField decoder_t::decodeSignal( can_signal_t& signal, const can_message_t& message, const std::vector<can_signal_t>& signals, bool* send) { |