add irq latency test code

Author: rcitach

examples/utest/testcases/perf/irq_latency_tc.c

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2006-2025, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2025-07-03     rcitach      test case for irq latency
+ */
+
+#include <rtthread.h>
+#include <rtdevice.h>
+#include <utest.h>
+#include <utest_assert.h>
+#include <perf_tc.h>
+
+static rt_device_t hw_dev = RT_NULL;
+static rt_sem_t complete_sem = RT_NULL;
+static rt_hwtimerval_t timeout = {0};
+static rt_perf_t *perf_local = RT_NULL;
+
+static void modify_time(rt_perf_t *perf)
+{
+    if(perf)
+        perf->real_time = perf->real_time - perf->tmp_time;
+}
+
+static rt_err_t timer_callback(rt_device_t dev, rt_size_t size)
+{
+    rt_perf_stop(perf_local);
+    if (perf_local->count >= UTEST_SYS_PERF_TC_COUNT)
+    {
+        rt_sem_release(complete_sem);
+        return RT_EOK;
+    }
+    rt_perf_start_impl(perf_local, &timeout);
+    return RT_EOK;
+}
+
+rt_err_t rt_perf_irq_latency(rt_perf_t *perf)
+{
+# if __STDC_VERSION__ >= 199901L
+    rt_strcpy(perf->name,__func__);
+#else
+    rt_strcpy(perf->name,"rt_perf_irq_latency");
+#endif
+    int ret = RT_EOK;
+    rt_hwtimer_mode_t mode = HWTIMER_MODE_PERIOD;
+
+    perf_local = perf;
+    hw_dev = rt_device_find(UTEST_HWTIMER_DEV_NAME);
+    if (hw_dev == RT_NULL)
+    {
+        ret = RT_ERROR;
+        LOG_E("hwtimer sample run failed! can't find %s device!", UTEST_HWTIMER_DEV_NAME);
+        return ret;
+    }
+
+    complete_sem = rt_sem_create("complete", 0, RT_IPC_FLAG_FIFO);
+    timeout.sec = 0;
+    timeout.usec = 50;   /* No modification is necessary here, use the fixed value */
+
+    rt_mutex_take(perf->lock,RT_WAITING_FOREVER);
+    perf_local->tmp_time = (rt_uint32_t)(timeout.sec * 1000000u + timeout.usec);
+    perf_local->local_modify = modify_time;
+    rt_mutex_release(perf->lock);
+
+    rt_device_set_rx_indicate(hw_dev, timer_callback);
+    rt_device_control(hw_dev, HWTIMER_CTRL_MODE_SET, (void *)&mode);
+
+    rt_perf_start_impl(perf_local, &timeout);
+
+    rt_sem_take(complete_sem, RT_WAITING_FOREVER);
+    rt_perf_dump(perf_local);
+    rt_sem_delete(complete_sem);
+    rt_device_close(hw_dev);
+
+    return RT_EOK;
+}
+