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== Log level ==
 
== Log level ==
−
To enable logging, set <code>LV_USE_LOG  1</code> in <code>lv_conf.h</code> and set <code>LV_LOG_LEVEL</code> to one of the following values:
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To enable logging, set <code style="color: #bb0000;">LV_USE_LOG  1</code> in <code style="color: #bb0000;">lv_conf.h</code> and set <code style="color: #bb0000;">LV_LOG_LEVEL</code> to one of the following values:
  
−
* <code>LV_LOG_LEVEL_TRACE</code> A lot of logs to give detailed information
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* <code style="color: #bb0000;">LV_LOG_LEVEL_TRACE</code> A lot of logs to give detailed information
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* <code>LV_LOG_LEVEL_INFO</code> Log important events
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* <code style="color: #bb0000;">LV_LOG_LEVEL_INFO</code> Log important events
−
* <code>LV_LOG_LEVEL_WARN</code> Log if something unwanted happened but didn't cause a problem
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* <code style="color: #bb0000;">LV_LOG_LEVEL_WARN</code> Log if something unwanted happened but didn't cause a problem
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* <code>LV_LOG_LEVEL_ERROR</code> Only critical issues, where the system may fail
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* <code style="color: #bb0000;">LV_LOG_LEVEL_ERROR</code> Only critical issues, where the system may fail
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* <code>LV_LOG_LEVEL_USER</code> Only user messages
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* <code style="color: #bb0000;">LV_LOG_LEVEL_USER</code> Only user messages
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* <code>LV_LOG_LEVEL_NONE</code> Do not log anything
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* <code style="color: #bb0000;">LV_LOG_LEVEL_NONE</code> Do not log anything
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−
The events which have a higher level than the set log level will be logged too. E.g. if you <code>LV_LOG_LEVEL_WARN</code>, errors will be also logged.
 
  
  
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The events which have a higher level than the set log level will be logged too. E.g. if you <code style="color: #bb0000;">LV_LOG_LEVEL_WARN</code>, errors will be also logged.
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=== Logging with printf ===
 
=== Logging with printf ===
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If your system supports <code>printf</code>, you just need to enable <code>LV_LOG_PRINTF</code> in <code>lv_conf.h</code> to send the logs with <code>printf</code>.
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If your system supports <code style="color: #bb0000;">printf</code>, you just need to enable <code style="color: #bb0000;">LV_LOG_PRINTF</code> in <code style="color: #bb0000;">lv_conf.h</code> to send the logs with <code style="color: #bb0000;">printf</code>.
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=== Custom log function ===
 
=== Custom log function ===
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If you can't use <code>printf</code> or want to use a custom function to log, you can register a "logger" callback with <code>lv_log_register_print_cb()</code>.
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{| class="wikitable"
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!英文
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!自動翻訳
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If you can't use <code style="color: #bb0000;">printf</code> or want to use a custom function to log, you can register a "logger" callback with <code style="color: #bb0000;">lv_log_register_print_cb()</code>.
  
  
 
For example:
 
For example:
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<syntaxhighlight lang="C++">
 
  void my_log_cb(const char * buf)
 
  void my_log_cb(const char * buf)
 
  {
 
  {
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  lv_log_register_print_cb(my_log_cb);
 
  lv_log_register_print_cb(my_log_cb);
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</syntaxhighlight>
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== Add logs ==
 
== Add logs ==
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You can also use the log module via the <code>LV_LOG_TRACE/INFO/WARN/ERROR/USER(text)</code> functions.
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----
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You can also use the log module via the <code style="color: #bb0000;">LV_LOG_TRACE/INFO/WARN/ERROR/USER(text)</code> functions.
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2022年6月22日 (水) 14:42時点における版

https://docs.lvgl.io/8.2/porting/log.html

英文 自動翻訳


Logging

LVGL has a built-in Log module to inform the user about what is happening in the library.

Log level

英文 自動翻訳

To enable logging, set LV_USE_LOG  1 in lv_conf.h and set LV_LOG_LEVEL to one of the following values:

  • LV_LOG_LEVEL_TRACE A lot of logs to give detailed information
  • LV_LOG_LEVEL_INFO Log important events
  • LV_LOG_LEVEL_WARN Log if something unwanted happened but didn't cause a problem
  • LV_LOG_LEVEL_ERROR Only critical issues, where the system may fail
  • LV_LOG_LEVEL_USER Only user messages
  • LV_LOG_LEVEL_NONE Do not log anything


The events which have a higher level than the set log level will be logged too. E.g. if you LV_LOG_LEVEL_WARN, errors will be also logged.

戻る : Previous


Printing logs

Logging with printf

英文 自動翻訳

If your system supports printf, you just need to enable LV_LOG_PRINTF in lv_conf.h to send the logs with printf.

戻る : Previous


Custom log function

英文 自動翻訳

If you can't use printf or want to use a custom function to log, you can register a "logger" callback with lv_log_register_print_cb().


For example: 

 void my_log_cb(const char * buf)
 {
   serial_send(buf, strlen(buf));
 }
 
 ...
 
 
 lv_log_register_print_cb(my_log_cb);
戻る : Previous


Add logs

英文 自動翻訳

You can also use the log module via the LV_LOG_TRACE/INFO/WARN/ERROR/USER(text) functions.

戻る : Previous
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