Logging

This GOAL core module provides functions to output data via an output channel like UART or Ethernet. The data can be divided into the following categories, named logging levels:

• error messages

• warning messages

• information messages

• debug messages

For each logging level this module provides an output function:

Table: Logging level output functions

The escape sequences \n and \r are filtered out from the before being send out through the channel.
The output channel is configured by the compiler-defines GOAL_CONFIG_LOGGING_TARET_RAW and GOAL_CONFIG_LOGGING_TARGET_SYSLOG.
GOAL provides generic format descriptors to output data to make printf-like format specifiers portable compared to the architecture and compilers. The GOAL format descriptors are initialized architecture-specific in …\goal\plat\arch\common\goal_arch_common.h. The following format descriptors are available: FMT_d32, FMT_i32, FMT_u32, FMT_x32, FMT_d64, FMT_i64, FMT_u64, FMT_x64, FMT_size_t, FMT_ptr and FMT_ptrdiff. FMT_ptr represents a pointer address. FMT_ptrdiff represents a difference of two pointer addresses.

Example: The actual position value of data type int32_t shall be printed as information:

goal_logInfo("actual position: "FMT_i32" inc", (int32_t) actPosVal); 

The logging functionality is available after the state GOAL_FSA_INIT_GOAL.
It is recommended only to enable logging during development as it can have a serious impact on the runtime behavior.

• GOAL files:

  • goal_log.[h,c]

• example:

  • …\goal\appl\task_lock

Configuration

The following compiler-defines are available to configure the logging:

• GOAL_CONFIG_LOGGING:

  • 0: logging is switched off for the complete GOAL system (default)

  • 1: logging is switched on and the logging can be used by other GOAL components

• GOAL_CONFIG_LOGGING_TARGET_RAW:

  • 0: no board-specific output channel is available (default)

  • 1: the board-specific output channel is used, most likely UART

    • The board-specific function goal_targetMsgRaw() must be available.

    • GOAL_CONFIG_LOGGING_TARGET_RAW_INSTANT (in addition to GOAL_CONFIG_LOGGING_TARGET_RAW)

      • 0: log messages are stored in a ring buffer
        (+ small influence on realtime behavior of the device)
        (- messages might be dropped)
        (- if device crashes last messages will not be printed)

      • 1: log messages are directly printed via goal_targetMsgRaw()
        (- big influence on realtime behavior of the device)
        (+ no messages are lost, because they are immediately printed)
        (+ messages are printed right after they have been created)

• GOAL_CONFIG_LOGGING_TARGET_SYSLOG:

  • 0: no output via a Ethernet channel (default)

  • 1: output via the Ethernet channel as broadcast Ethernet frame, e.g. to indicate the frame by Wireshark

Platform API

Table: goal_targetMsgRaw()