2022年6月22日 (水) 14:40時点における版

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.

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.

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

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);

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

@@ 23行目: / 23行目: @@
 * <code>LV_LOG_LEVEL_USER</code> Only user messages
 * <code>LV_LOG_LEVEL_NONE</code> Do not log anything
 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.
@@ 35行目: / 37行目: @@
 === Custom log function ===
 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>.
+For example:
+ void my_log_cb(const char * buf)
+ {
+   serial_send(buf, strlen(buf));
+ }
+ ...
+ lv_log_register_print_cb(my_log_cb);
+== Add logs ==
+You can also use the log module via the <code>LV_LOG_TRACE/INFO/WARN/ERROR/USER(text)</code> functions.
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