Wrote code to measure CPU utilization

lib/firmware-base/system-status.c

@@ -0,0 +1,94 @@
+#include <driver/timer.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/timers.h>
+
+#include <stdio.h>
+
+#define TIMER_DIVIDER 80  // Divide Base by 80
+
+
+// Timer group 0, timer 0 configuration
+timer_config_t timer_config = {
+	.alarm_en    = TIMER_ALARM_DIS,	     // Disable alarm
+	.intr_type   = TIMER_INTR_DISABLE,   // No timer interrupts
+	.counter_dir = TIMER_COUNT_UP,	     // Count up
+	.auto_reload = TIMER_AUTORELOAD_EN,  // Auto-reload
+	.divider = TIMER_DIVIDER  // Set divider for 1ms (assumption that base
+				  // runs at 80Mhz)
+};
+
+// Initialization
+void init_timer0()
+{
+	timer_init(TIMER_GROUP_0, TIMER_0, &timer_config);
+	timer_set_counter_value(TIMER_GROUP_0, TIMER_0, 0);
+	timer_start(TIMER_GROUP_0, TIMER_0);
+}
+
+volatile uint64_t core0_idle_cycles = 0;
+volatile uint64_t core1_idle_cycles = 0;
+
+// When idle
+void vAppliocationIdleHook(void)
+{
+	// For ISR to handle (?)
+	BaseType_t xHigherPriorityTaskWoken = pdFALSE;
+
+	// Which core? (assumption 1 cycle == 1 tick)
+	// Can ccheck by creating vApplicationTickHook and comparing # tick and
+	// # idle cycles << todo
+
+	if (xPortGetCoreID() == 0) {
+		core0_idle_cycles++;
+	} else if (xPortGetCoreID() == 1) {
+		core1_idle_cycles++;
+	}
+}
+
+void print_cpu_utilization(void *pvParameters)
+{
+	while (1) {
+		uint64_t start_time = 0, end_time = 0;
+
+		timer_get_counter_value(TIMER_GROUP_0, TIMER_0, &start_time);
+
+		// Let run for 5 sec
+		// Interrupts can be called here to run other tasks
+		// What if interrupt task runs for more than 5 secs?
+		vTaskDelay(pdMS_TO_TICKS(5000));
+
+		timer_get_counter_value(TIMER_GROUP_0, TIMER_0, &end_time);
+
+		// Calculate total ticks/cycles in 1 sec
+		uint64_t ticks_elapsed = end_time - start_time;
+
+		float core0_utilization = 100.0
+			- ((float) core0_idle_cycles / ticks_elapsed) * 100.0;
+		float core1_utilization = 100.0
+			- ((float) core1_idle cycles / ticks_elapsed) * 100.0;
+
+		// Print CPU utilization
+		printf("Core 0 CPU Utilization: %.2f\n", core0_utilization);
+		printf("Core 1 CPU Utilization: %.2f\n", core1_utilization);
+
+		// Reset idle cycles
+		core0_idle_cycles = 0;
+		core1_idle_cycles = 0;
+
+		// Might need to handle overflow if it does occur
+	}
+}
+
+void app_main()
+{
+	init_timer0();
+
+	xTaskCreate(print_cpu_utilization,
+		"Print CPU Utilization",
+		2048,
+		NULL,
+		1,
+		NULL);
+
+	vTaskStartScheduler();
+}