LVGL 库提交

2026-08-30 08:57:07 +08:00
parent 26c9098630
commit e2f199c6bf
1056 changed files with 556743 additions and 45 deletions
@@ -0,0 +1,122 @@
+/**
+ * @file lv_linux.c
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+#include "lv_os.h"
+
+#if LV_USE_OS != LV_OS_NONE && defined(__linux__)
+
+#include "../core/lv_global.h"
+#include "../misc/lv_log.h"
+#include "lv_linux_private.h"
+#include <stdio.h>
+
+/*********************
+ *      DEFINES
+ *********************/
+
+#define LV_UPTIME_MONITOR_FILE         "/proc/stat"
+
+#define LV_PROC_STAT_VAR_FORMAT        " %" PRIu32
+#define LV_PROC_STAT_IGNORE_VAR_FORMAT " %*" PRIu32
+
+#define last_proc_stat LV_GLOBAL_DEFAULT()->linux_last_proc_stat
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+
+static lv_result_t lv_read_proc_stat(lv_proc_stat_t * result);
+static uint32_t lv_proc_stat_get_total(const lv_proc_stat_t * p);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+uint32_t lv_os_get_idle_percent(void)
+{
+    lv_proc_stat_t proc_stat;
+    {
+        lv_result_t err = lv_read_proc_stat(&proc_stat);
+
+        if(err == LV_RESULT_INVALID) {
+            return UINT32_MAX;
+        }
+
+        for(size_t i = 0; i < LV_PROC_STAT_PARAMS_LEN; ++i) {
+            uint32_t delta =
+                proc_stat.buffer[i] - last_proc_stat.buffer[i];
+            /* Update old for next call*/
+            last_proc_stat.buffer[i] = proc_stat.buffer[i];
+            /* Store delta in new */
+            proc_stat.buffer[i] = delta;
+        }
+    }
+
+    /* From here onwards, there's no risk of overflowing as long as we call this function regularly */
+    const uint32_t total = lv_proc_stat_get_total(&proc_stat);
+
+    if(total == 0) {
+        return 0;
+    }
+
+    return (proc_stat.fields.idle * 100) / total;
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+static lv_result_t lv_read_proc_stat(lv_proc_stat_t * result)
+{
+    FILE * fp = fopen(LV_UPTIME_MONITOR_FILE, "r");
+
+    if(!fp) {
+        LV_LOG_ERROR("Failed to open " LV_UPTIME_MONITOR_FILE);
+        return LV_RESULT_INVALID;
+    }
+    const char * fmt = "cpu " LV_PROC_STAT_VAR_FORMAT LV_PROC_STAT_VAR_FORMAT
+                       LV_PROC_STAT_VAR_FORMAT LV_PROC_STAT_VAR_FORMAT
+                       LV_PROC_STAT_IGNORE_VAR_FORMAT LV_PROC_STAT_VAR_FORMAT
+                       LV_PROC_STAT_VAR_FORMAT LV_PROC_STAT_VAR_FORMAT;
+
+    int err = fscanf(fp, fmt, &result->fields.user, &result->fields.nice,
+                     &result->fields.system, &result->fields.idle,
+                     &result->fields.irq, &result->fields.softirq,
+                     &result->fields.steal);
+
+    fclose(fp);
+
+    if(err != LV_PROC_STAT_PARAMS_LEN) {
+        LV_LOG_ERROR("Failed to parse " LV_UPTIME_MONITOR_FILE);
+        return LV_RESULT_INVALID;
+    }
+    return LV_RESULT_OK;
+}
+static uint32_t lv_proc_stat_get_total(const lv_proc_stat_t * p)
+{
+    uint32_t sum = 0;
+    for(size_t i = 0; i < LV_PROC_STAT_PARAMS_LEN; ++i) {
+        sum += p->buffer[i];
+    }
+    return sum;
+}
+
+#endif