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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
View File

@@ -24,6 +24,11 @@
#define LV_MEM_CUSTOM_ALLOC malloc /*Wrapper to malloc*/ #define LV_MEM_CUSTOM_ALLOC malloc /*Wrapper to malloc*/
#define LV_MEM_CUSTOM_FREE free /*Wrapper to free*/ #define LV_MEM_CUSTOM_FREE free /*Wrapper to free*/
#endif /*LV_MEM_CUSTOM*/ #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 Graphical settings

8
lv_hal/lv_hal_tick.c
View File

@@ -15,6 +15,10 @@
#include "lv_hal_tick.h" #include "lv_hal_tick.h"
#include <stddef.h> #include <stddef.h>
#if LV_TICK_CUSTOM == 1
#include LV_TICK_CUSTOM_INCLUDE
#endif
/********************* /*********************
* DEFINES * DEFINES
*********************/ *********************/
@@ -57,6 +61,7 @@ LV_ATTRIBUTE_TICK_INC void lv_tick_inc(uint32_t tick_period)
*/ */
uint32_t lv_tick_get(void) uint32_t lv_tick_get(void)
{ {
#if LV_TICK_CUSTOM == 0
uint32_t result; uint32_t result;
do { do {
tick_irq_flag = 1; tick_irq_flag = 1;
@@ -64,6 +69,9 @@ uint32_t lv_tick_get(void)
} while(!tick_irq_flag); /*'lv_tick_inc()' clears this flag which can be in an interrupt. Continue until make a non interrupted cycle */ } while(!tick_irq_flag); /*'lv_tick_inc()' clears this flag which can be in an interrupt. Continue until make a non interrupted cycle */
return result; return result;
#else
return LV_TICK_CUSTOM_SYS_TIME_EXPR;
#endif
} }
/** /**