| .. _logger_sample: |
| |
| Logging |
| ########### |
| |
| Overview |
| ******** |
| A simple application that demonstrates use of logging subsystem. It demonstrates |
| main features: severity levels, timestamping, module level filtering and |
| instance level filtering. It also showcases logging capabilities in terms of |
| performance. |
| |
| Building and Running |
| ******************** |
| |
| This project outputs multiple log message to the console. It can be built and |
| executed on QEMU as follows: |
| |
| .. zephyr-app-commands:: |
| :zephyr-app: samples/subsys/logging/logger |
| :host-os: unix |
| :board: qemu_x86 |
| :goals: run |
| :compact: |
| |
| |
| Sample Output |
| ============= |
| |
| .. code-block:: console |
| |
| Module logging showcase. |
| [00:00:00.000,122] <info> foo: log in test_module 11 |
| Disabling logging in the foo module |
| Function called again but with logging disabled. |
| Instance level logging showcase. |
| [00:00:00.000,274] <info> sample_instance.inst1: counter_value: 0 |
| [00:00:00.000,274] <warn> sample_instance.inst1: Example of hexdump: |
| [00:00:00.000,305] <warn> sample_instance.inst1: 01 02 03 04 |.... |
| [00:00:00.000,305] <info> sample_instance.inst2: counter_value: 0 |
| [00:00:00.000,305] <warn> sample_instance.inst2: Example of hexdump: |
| [00:00:00.000,305] <warn> sample_instance.inst2: 01 02 03 04 |.... |
| Changing filter to warning on sample_instance.inst1 instance. |
| [00:00:00.000,396] <warn> sample_instance.inst1: Example of hexdump: |
| [00:00:00.000,427] <warn> sample_instance.inst1: 01 02 03 04 |.... |
| [00:00:00.000,427] <info> sample_instance.inst2: counter_value: 1 |
| [00:00:00.000,427] <warn> sample_instance.inst2: Example of hexdump: |
| [00:00:00.000,427] <warn> sample_instance.inst2: 01 02 03 04 |.... |
| Disabling logging on both instances. |
| Function call on both instances with logging disabled. |
| Severity levels showcase. |
| [00:00:00.000,610] <err> main: Error message example. |
| [00:00:00.000,610] <warn> main: Warning message example. |
| [00:00:00.000,610] <info> main: Info message example. |
| Logging performance showcase. |
| [00:00:00.134,887] <info> main: performance test - log message 0 |
| [00:00:00.134,887] <info> main: performance test - log message 1 |
| [00:00:00.134,887] <info> main: performance test - log message 2 |
| [00:00:00.134,887] <info> main: performance test - log message 3 |
| [00:00:00.134,887] <info> main: performance test - log message 4 |
| [00:00:00.134,887] <info> main: performance test - log message 5 |
| [00:00:00.134,887] <info> main: performance test - log message 6 |
| [00:00:00.134,918] <info> main: performance test - log message 7 |
| [00:00:00.134,918] <info> main: performance test - log message 8 |
| [00:00:00.134,918] <info> main: performance test - log message 9 |
| [00:00:00.134,918] <info> main: performance test - log message 10 |
| [00:00:00.134,918] <info> main: performance test - log message 11 |
| [00:00:00.134,918] <info> main: performance test - log message 12 |
| [00:00:00.134,918] <info> main: performance test - log message 13 |
| [00:00:00.134,948] <info> main: performance test - log message 14 |
| Estimated logging capabilities: 245760 messages/second |
