feat(freertos): add functions to better measure the CPU usage (#6619)

src/core/lv_global.h

@@ -222,6 +222,14 @@ typedef struct lv_global_t {
     lv_mutex_t lv_general_mutex;
 #endif
 
+#if LV_USE_OS == LV_OS_FREERTOS
+    uint32_t freertos_idle_time_sum;
+    uint32_t freertos_non_idle_time_sum;
+    uint32_t freertos_task_switch_timestamp;
+    bool freertos_idle_task_running;
+#endif
+
+
     void * user_data;
 } lv_global_t;
 

src/osal/lv_freertos.c

@@ -13,7 +13,6 @@
  *      INCLUDES
  *********************/
 #include "lv_os.h"
-
 #if LV_USE_OS == LV_OS_FREERTOS
 
 #if (ESP_PLATFORM)
@@ -22,7 +21,10 @@
     #include "atomic.h"
 #endif
 
+#include "../tick/lv_tick.h"
 #include "../misc/lv_log.h"
+#include "../core/lv_global.h"
+
 /*********************
  *      DEFINES
  *********************/
@@ -32,6 +34,8 @@
     #define pcTASK_NAME "lvglDraw"
 #endif
 
+#define globals LV_GLOBAL_DEFAULT()
+
 /**********************
  *      TYPEDEFS
  **********************/
@@ -348,6 +352,38 @@ lv_result_t lv_thread_sync_signal_isr(lv_thread_sync_t * pxCond)
     return LV_RESULT_OK;
 }
 
+
+void lv_freertos_task_switch_in(const char * name)
+{
+    if(lv_strcmp(name, "IDLE")) globals->freertos_idle_task_running = false;
+    else globals->freertos_idle_task_running = true;
+
+    globals->freertos_task_switch_timestamp = lv_tick_get();
+}
+
+void lv_freertos_task_switch_out(void)
+{
+    uint32_t elaps = lv_tick_elaps(globals->freertos_task_switch_timestamp);
+    if(globals->freertos_idle_task_running) globals->freertos_idle_time_sum += elaps;
+    else globals->freertos_non_idle_time_sum += elaps;
+}
+
+uint32_t lv_os_get_idle_percent(void)
+{
+    if(globals->freertos_non_idle_time_sum + globals->freertos_idle_time_sum == 0) {
+        LV_LOG_WARN("Not enough time elapsed to provide idle percentage");
+        return 0;
+    }
+
+    uint32_t pct = (globals->freertos_idle_time_sum * 100) / (globals->freertos_idle_time_sum +
+                                                              globals->freertos_non_idle_time_sum);
+
+    globals->freertos_non_idle_time_sum = 0;
+    globals->freertos_idle_time_sum = 0;
+
+    return pct;
+}
+
 /**********************
  *   STATIC FUNCTIONS
  **********************/

src/osal/lv_freertos.h

@@ -77,6 +77,29 @@ typedef struct {
  * GLOBAL PROTOTYPES
  **********************/
 
+/**
+ * Set it for `traceTASK_SWITCHED_IN()` as
+ * `lv_freertos_task_switch_in(pxCurrentTCB->pcTaskName)`
+ * to save the start time stamp of a task
+ * @param name      the name of the which is switched in
+ */
+void lv_freertos_task_switch_in(const char * name);
+
+/**
+ * Set it for `traceTASK_SWITCHED_OUT()` as
+ * `lv_freertos_task_switch_out()`
+ * to save finish time stamp of a task
+ */
+void lv_freertos_task_switch_out(void);
+
+/**
+ * Set it for `LV_SYSMON_GET_IDLE` to show the CPU usage
+ * as reported based the usage of FreeRTOS's idle task
+ * If it's important when a GPU is used.
+ * @return the idle percentage since the last call
+ */
+uint32_t lv_os_get_idle_percent(void);
+
 /**********************
  *      MACROS
  **********************/