101 lines
2.1 KiB
C
101 lines
2.1 KiB
C
|
/**
|
||
|
|
* @file systick.c
|
||
|
|
* Provide access to the system tick with 1 millisecond resolution
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*********************
|
||
|
|
* INCLUDES
|
||
|
|
*********************/
|
||
|
|
#ifdef LV_CONF_INCLUDE_SIMPLE
|
||
|
|
#include "lv_conf.h"
|
||
|
|
#else
|
||
|
|
#include "../../lv_conf.h"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "lv_hal_tick.h"
|
||
|
|
#include <stddef.h>
|
||
|
|
|
||
|
|
#if LV_TICK_CUSTOM == 1
|
||
|
|
#include LV_TICK_CUSTOM_INCLUDE
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*********************
|
||
|
|
* DEFINES
|
||
|
|
*********************/
|
||
|
|
|
||
|
|
/**********************
|
||
|
|
* TYPEDEFS
|
||
|
|
**********************/
|
||
|
|
|
||
|
|
/**********************
|
||
|
|
* STATIC PROTOTYPES
|
||
|
|
**********************/
|
||
|
|
|
||
|
|
/**********************
|
||
|
|
* STATIC VARIABLES
|
||
|
|
**********************/
|
||
|
|
static uint32_t sys_time = 0;
|
||
|
|
static volatile uint8_t tick_irq_flag;
|
||
|
|
|
||
|
|
/**********************
|
||
|
|
* MACROS
|
||
|
|
**********************/
|
||
|
|
|
||
|
|
/**********************
|
||
|
|
* GLOBAL FUNCTIONS
|
||
|
|
**********************/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* You have to call this function periodically
|
||
|
|
* @param tick_period the call period of this function in milliseconds
|
||
|
|
*/
|
||
|
|
LV_ATTRIBUTE_TICK_INC void lv_tick_inc(uint32_t tick_period)
|
||
|
|
{
|
||
|
|
tick_irq_flag = 0;
|
||
|
|
sys_time += tick_period;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Get the elapsed milliseconds since start up
|
||
|
|
* @return the elapsed milliseconds
|
||
|
|
*/
|
||
|
|
uint32_t lv_tick_get(void)
|
||
|
|
{
|
||
|
|
#if LV_TICK_CUSTOM == 0
|
||
|
|
uint32_t result;
|
||
|
|
do {
|
||
|
|
tick_irq_flag = 1;
|
||
|
|
result = sys_time;
|
||
|
|
} 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;
|
||
|
|
#else
|
||
|
|
return LV_TICK_CUSTOM_SYS_TIME_EXPR;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Get the elapsed milliseconds since a previous time stamp
|
||
|
|
* @param prev_tick a previous time stamp (return value of systick_get() )
|
||
|
|
* @return the elapsed milliseconds since 'prev_tick'
|
||
|
|
*/
|
||
|
|
uint32_t lv_tick_elaps(uint32_t prev_tick)
|
||
|
|
{
|
||
|
|
uint32_t act_time = lv_tick_get();
|
||
|
|
|
||
|
|
/*If there is no overflow in sys_time simple subtract*/
|
||
|
|
if(act_time >= prev_tick) {
|
||
|
|
prev_tick = act_time - prev_tick;
|
||
|
|
} else {
|
||
|
|
prev_tick = UINT32_MAX - prev_tick + 1;
|
||
|
|
prev_tick += act_time;
|
||
|
|
}
|
||
|
|
|
||
|
|
return prev_tick;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**********************
|
||
|
|
* STATIC FUNCTIONS
|
||
|
|
**********************/
|
||
|
|
|