mirror of
https://github.com/suchmememanyskill/TegraExplorer.git
synced 2024-11-29 23:32:06 +00:00
332 lines
9.6 KiB
C
332 lines
9.6 KiB
C
/**
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* @file lv_task.c
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* An 'lv_task' is a void (*fp) (void* param) type function which will be called periodically.
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* A priority (5 levels + disable) can be assigned to lv_tasks.
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*/
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/*********************
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* INCLUDES
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*********************/
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#include <stddef.h>
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#include "lv_task.h"
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#include "../lv_hal/lv_hal_tick.h"
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#include "lv_gc.h"
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#if defined(LV_GC_INCLUDE)
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# include LV_GC_INCLUDE
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#endif /* LV_ENABLE_GC */
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/*********************
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* DEFINES
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*********************/
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#define IDLE_MEAS_PERIOD 500 /*[ms]*/
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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static bool lv_task_exec(lv_task_t * lv_task_p);
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/**********************
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* STATIC VARIABLES
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**********************/
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static bool lv_task_run = false;
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static uint8_t idle_last = 0;
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static bool task_deleted;
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static bool task_created;
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/**********************
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* MACROS
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**********************/
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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/**
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* Init the lv_task module
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*/
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void lv_task_init(void)
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{
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lv_ll_init(&LV_GC_ROOT(_lv_task_ll), sizeof(lv_task_t));
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/*Initially enable the lv_task handling*/
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lv_task_enable(true);
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}
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/**
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* Call it periodically to handle lv_tasks.
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*/
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LV_ATTRIBUTE_TASK_HANDLER void lv_task_handler(void)
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{
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LV_LOG_TRACE("lv_task_handler started");
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/*Avoid concurrent running of the task handler*/
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static bool task_handler_mutex = false;
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if(task_handler_mutex) return;
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task_handler_mutex = true;
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static uint32_t idle_period_start = 0;
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static uint32_t handler_start = 0;
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static uint32_t busy_time = 0;
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if(lv_task_run == false) return;
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handler_start = lv_tick_get();
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/* Run all task from the highest to the lowest priority
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* If a lower priority task is executed check task again from the highest priority
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* but on the priority of executed tasks don't run tasks before the executed*/
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lv_task_t * task_interrupter = NULL;
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lv_task_t * next;
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bool end_flag;
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do {
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end_flag = true;
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task_deleted = false;
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task_created = false;
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LV_GC_ROOT(_lv_task_act) = lv_ll_get_head(&LV_GC_ROOT(_lv_task_ll));
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while(LV_GC_ROOT(_lv_task_act)) {
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/* The task might be deleted if it runs only once ('once = 1')
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* So get next element until the current is surely valid*/
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next = lv_ll_get_next(&LV_GC_ROOT(_lv_task_ll), LV_GC_ROOT(_lv_task_act));
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/*We reach priority of the turned off task. There is nothing more to do.*/
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if(((lv_task_t *)LV_GC_ROOT(_lv_task_act))->prio == LV_TASK_PRIO_OFF) {
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break;
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}
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/*Here is the interrupter task. Don't execute it again.*/
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if(LV_GC_ROOT(_lv_task_act) == task_interrupter) {
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task_interrupter = NULL; /*From this point only task after the interrupter comes, so the interrupter is not interesting anymore*/
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LV_GC_ROOT(_lv_task_act) = next;
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continue; /*Load the next task*/
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}
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/*Just try to run the tasks with highest priority.*/
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if(((lv_task_t *)LV_GC_ROOT(_lv_task_act))->prio == LV_TASK_PRIO_HIGHEST) {
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lv_task_exec(LV_GC_ROOT(_lv_task_act));
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}
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/*Tasks with higher priority then the interrupted shall be run in every case*/
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else if(task_interrupter) {
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if(((lv_task_t *)LV_GC_ROOT(_lv_task_act))->prio > task_interrupter->prio) {
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if(lv_task_exec(LV_GC_ROOT(_lv_task_act))) {
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task_interrupter = LV_GC_ROOT(_lv_task_act); /*Check all tasks again from the highest priority */
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end_flag = false;
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break;
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}
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}
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}
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/* It is no interrupter task or we already reached it earlier.
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* Just run the remaining tasks*/
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else {
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if(lv_task_exec(LV_GC_ROOT(_lv_task_act))) {
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task_interrupter = LV_GC_ROOT(_lv_task_act); /*Check all tasks again from the highest priority */
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end_flag = false;
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break;
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}
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}
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if(task_deleted) break; /*If a task was deleted then this or the next item might be corrupted*/
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if(task_created) break; /*If a task was deleted then this or the next item might be corrupted*/
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LV_GC_ROOT(_lv_task_act) = next; /*Load the next task*/
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}
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} while(!end_flag);
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busy_time += lv_tick_elaps(handler_start);
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uint32_t idle_period_time = lv_tick_elaps(idle_period_start);
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if(idle_period_time >= IDLE_MEAS_PERIOD) {
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idle_last = (uint32_t)((uint32_t)busy_time * 100) / IDLE_MEAS_PERIOD; /*Calculate the busy percentage*/
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idle_last = idle_last > 100 ? 0 : 100 - idle_last; /*But we need idle time*/
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busy_time = 0;
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idle_period_start = lv_tick_get();
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}
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task_handler_mutex = false; /*Release the mutex*/
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LV_LOG_TRACE("lv_task_handler ready");
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}
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/**
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* Create a new lv_task
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* @param task a function which is the task itself
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* @param period call period in ms unit
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* @param prio priority of the task (LV_TASK_PRIO_OFF means the task is stopped)
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* @param param free parameter
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* @return pointer to the new task
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*/
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lv_task_t * lv_task_create(void (*task)(void *), uint32_t period, lv_task_prio_t prio, void * param)
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{
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lv_task_t * new_lv_task = NULL;
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lv_task_t * tmp;
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/*Create task lists in order of priority from high to low*/
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tmp = lv_ll_get_head(&LV_GC_ROOT(_lv_task_ll));
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if(NULL == tmp) { /*First task*/
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new_lv_task = lv_ll_ins_head(&LV_GC_ROOT(_lv_task_ll));
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lv_mem_assert(new_lv_task);
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if(new_lv_task == NULL) return NULL;
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} else {
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do {
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if(tmp->prio <= prio) {
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new_lv_task = lv_ll_ins_prev(&LV_GC_ROOT(_lv_task_ll), tmp);
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lv_mem_assert(new_lv_task);
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if(new_lv_task == NULL) return NULL;
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break;
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}
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tmp = lv_ll_get_next(&LV_GC_ROOT(_lv_task_ll), tmp);
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} while(tmp != NULL);
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if(tmp == NULL) { /*Only too high priority tasks were found*/
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new_lv_task = lv_ll_ins_tail(&LV_GC_ROOT(_lv_task_ll));
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lv_mem_assert(new_lv_task);
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if(new_lv_task == NULL) return NULL;
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}
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}
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new_lv_task->period = period;
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new_lv_task->task = task;
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new_lv_task->prio = prio;
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new_lv_task->param = param;
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new_lv_task->once = 0;
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new_lv_task->last_run = lv_tick_get();
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task_created = true;
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return new_lv_task;
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}
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/**
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* Delete a lv_task
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* @param lv_task_p pointer to task created by lv_task_p
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*/
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void lv_task_del(lv_task_t * lv_task_p)
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{
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lv_ll_rem(&LV_GC_ROOT(_lv_task_ll), lv_task_p);
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lv_mem_free(lv_task_p);
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if(LV_GC_ROOT(_lv_task_act) == lv_task_p) task_deleted = true; /*The active task was deleted*/
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}
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/**
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* Set new priority for a lv_task
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* @param lv_task_p pointer to a lv_task
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* @param prio the new priority
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*/
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void lv_task_set_prio(lv_task_t * lv_task_p, lv_task_prio_t prio)
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{
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/*Find the tasks with new priority*/
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lv_task_t * i;
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LL_READ(LV_GC_ROOT(_lv_task_ll), i) {
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if(i->prio <= prio) {
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if(i != lv_task_p) lv_ll_move_before(&LV_GC_ROOT(_lv_task_ll), lv_task_p, i);
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break;
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}
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}
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/*There was no such a low priority so far then add the node to the tail*/
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if(i == NULL) {
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lv_ll_move_before(&LV_GC_ROOT(_lv_task_ll), lv_task_p, NULL);
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}
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lv_task_p->prio = prio;
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}
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/**
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* Set new period for a lv_task
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* @param lv_task_p pointer to a lv_task
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* @param period the new period
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*/
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void lv_task_set_period(lv_task_t * lv_task_p, uint32_t period)
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{
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lv_task_p->period = period;
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}
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/**
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* Make a lv_task ready. It will not wait its period.
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* @param lv_task_p pointer to a lv_task.
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*/
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void lv_task_ready(lv_task_t * lv_task_p)
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{
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lv_task_p->last_run = lv_tick_get() - lv_task_p->period - 1;
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}
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/**
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* Delete the lv_task after one call
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* @param lv_task_p pointer to a lv_task.
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*/
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void lv_task_once(lv_task_t * lv_task_p)
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{
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lv_task_p->once = 1;
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}
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/**
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* Reset a lv_task.
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* It will be called the previously set period milliseconds later.
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* @param lv_task_p pointer to a lv_task.
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*/
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void lv_task_reset(lv_task_t * lv_task_p)
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{
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lv_task_p->last_run = lv_tick_get();
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}
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/**
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* Enable or disable the whole lv_task handling
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* @param en: true: lv_task handling is running, false: lv_task handling is suspended
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*/
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void lv_task_enable(bool en)
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{
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lv_task_run = en;
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}
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/**
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* Get idle percentage
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* @return the lv_task idle in percentage
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*/
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uint8_t lv_task_get_idle(void)
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{
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return idle_last;
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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/**
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* Execute task if its the priority is appropriate
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* @param lv_task_p pointer to lv_task
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* @return true: execute, false: not executed
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*/
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static bool lv_task_exec(lv_task_t * lv_task_p)
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{
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bool exec = false;
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/*Execute if at least 'period' time elapsed*/
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uint32_t elp = lv_tick_elaps(lv_task_p->last_run);
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if(elp >= lv_task_p->period) {
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lv_task_p->last_run = lv_tick_get();
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task_deleted = false;
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task_created = false;
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lv_task_p->task(lv_task_p->param);
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/*Delete if it was a one shot lv_task*/
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if(task_deleted == false) { /*The task might be deleted by itself as well*/
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if(lv_task_p->once != 0) {
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lv_task_del(lv_task_p);
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}
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}
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exec = true;
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}
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return exec;
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}
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