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Add a system time callback to be used without lv_tick_inc.

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With a new configuration option one can now remove the need for
repeatedly calling `lv_tick_inc` for hardware that already provides
system time in another way.

The configuration example is set for an Arduino, but this was initially
developed for an nrf52 with the following config:

```
 #define LV_TICK_CUSTOM    1
 #if LV_TICK_CUSTOM == 1
 #define LV_TICK_CUSTOM_INCLUDE  "app_timer.h"
 #define LV_TICK_CUSTOM_SYS_TIME_EXPR (app_timer_cnt_get()/APP_TIMER_TICKS(1))
 #endif     /*LV_TICK_CUSTOM*/
```
This commit is contained in:
Stefan Krastanov
2018-08-27 18:51:44 -04:00
parent 25a6b0cde6
commit 4e70bbc49f
2 changed files with 13 additions and 0 deletions
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5
lv_conf_templ.h
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@@ -24,6 +24,11 @@
#define LV_MEM_CUSTOM_ALLOC malloc /*Wrapper to malloc*/
#define LV_MEM_CUSTOM_FREE free /*Wrapper to free*/
#endif /*LV_MEM_CUSTOM*/
#define LV_TICK_CUSTOM 0 /*1: use a custom tick source (removing the need to manually update the tick with `lv_tick_inc`) */
#if LV_TICK_CUSTOM == 1
#define LV_TICK_CUSTOM_INCLUDE "Arduino.h" /*Header for the sys time function*/
#define LV_TICK_CUSTOM_SYS_TIME_EXPR (millis()) /*Expression evaluating to current systime in ms*/
#endif /*LV_TICK_CUSTOM*/
/*===================
Graphical settings