esp_event: test posting from interrupt handler

components/esp_event/test/test_event.c

@@ -7,7 +7,11 @@
 #include "freertos/FreeRTOS.h"
 #include "esp_event_loop.h"
 #include "freertos/task.h"
+#include "freertos/portmacro.h"
 #include "esp_log.h"
+#include "soc/timer_group_struct.h"
+#include "driver/periph_ctrl.h"
+#include "driver/timer.h"
 
 #include "esp_event.h"
 #include "esp_event_private.h"
@@ -268,6 +272,48 @@ static void test_teardown()
     TEST_ASSERT_EQUAL(ESP_OK, esp_event_loop_delete_default());
 }
 
+#define TIMER_DIVIDER         16  //  Hardware timer clock divider
+#define TIMER_SCALE           (TIMER_BASE_CLK / TIMER_DIVIDER)  // convert counter value to seconds
+#define TIMER_INTERVAL0_SEC   (2.0) // sample test interval for the first timer
+
+#if CONFIG_POST_EVENTS_FROM_ISR
+static void test_handler_post_from_isr(void* event_handler_arg, esp_event_base_t event_base, int32_t event_id, void* event_data)
+{
+    SemaphoreHandle_t *sem = (SemaphoreHandle_t*) event_handler_arg;
+    // Event data is just the address value (maybe have been truncated due to casting).
+    int *data = (int*) event_data;
+    TEST_ASSERT_EQUAL(*data, (int) (*sem));
+    xSemaphoreGive(*sem);
+}
+#endif
+
+#if CONFIG_POST_EVENTS_FROM_ISR
+void IRAM_ATTR test_event_on_timer_alarm(void* para)
+{
+    /* Retrieve the interrupt status and the counter value
+       from the timer that reported the interrupt */
+    TIMERG0.hw_timer[TIMER_0].update = 1;
+    uint64_t timer_counter_value =
+        ((uint64_t) TIMERG0.hw_timer[TIMER_0].cnt_high) << 32
+        | TIMERG0.hw_timer[TIMER_0].cnt_low;
+
+    TIMERG0.int_clr_timers.t0 = 1;
+    timer_counter_value += (uint64_t) (TIMER_INTERVAL0_SEC * TIMER_SCALE);
+    TIMERG0.hw_timer[TIMER_0].alarm_high = (uint32_t) (timer_counter_value >> 32);
+    TIMERG0.hw_timer[TIMER_0].alarm_low = (uint32_t) timer_counter_value;
+
+    int data = (int) para;
+    // Posting events with data more than 4 bytes should fail.
+    TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_event_isr_post(s_test_base1, TEST_EVENT_BASE1_EV1, &data, 5, NULL));
+    // This should succeedd, as data is int-sized. The handler for the event checks that the passed event data
+    // is correct.
+    BaseType_t task_unblocked;
+    TEST_ASSERT_EQUAL(ESP_OK, esp_event_isr_post(s_test_base1, TEST_EVENT_BASE1_EV1, &data, sizeof(data), &task_unblocked));
+    if (task_unblocked == pdTRUE) {
+        portYIELD_FROM_ISR();
+    }
+}
+#endif //CONFIG_POST_EVENTS_FROM_ISR
 
 TEST_CASE("can create and delete event loops", "[event]")
 {
@@ -1102,6 +1148,44 @@ TEST_CASE("events are dispatched in the order they are registered", "[event]")
     TEST_TEARDOWN();
 }
 
+#if CONFIG_POST_EVENTS_FROM_ISR
+TEST_CASE("can post events from interrupt handler", "[event]")
+{
+    SemaphoreHandle_t sem = xSemaphoreCreateBinary();
+
+    /* Select and initialize basic parameters of the timer */
+    timer_config_t config;
+    config.divider = TIMER_DIVIDER;
+    config.counter_dir = TIMER_COUNT_UP;
+    config.counter_en = TIMER_PAUSE;
+    config.alarm_en = TIMER_ALARM_EN;
+    config.intr_type = TIMER_INTR_LEVEL;
+    config.auto_reload = false;
+    timer_init(TIMER_GROUP_0, TIMER_0, &config);
+
+    /* Timer's counter will initially start from value below.
+       Also, if auto_reload is set, this value will be automatically reload on alarm */
+    timer_set_counter_value(TIMER_GROUP_0, TIMER_0, 0x00000000ULL);
+
+    /* Configure the alarm value and the interrupt on alarm. */
+    timer_set_alarm_value(TIMER_GROUP_0, TIMER_0, TIMER_INTERVAL0_SEC * TIMER_SCALE);
+    timer_enable_intr(TIMER_GROUP_0, TIMER_0);
+    timer_isr_register(TIMER_GROUP_0, TIMER_0, test_event_on_timer_alarm,
+        (void *) sem, ESP_INTR_FLAG_IRAM, NULL);
+
+    timer_start(TIMER_GROUP_0, TIMER_0);
+
+    TEST_SETUP();
+
+    TEST_ASSERT_EQUAL(ESP_OK, esp_event_handler_register(s_test_base1, TEST_EVENT_BASE1_EV1,
+                                                        test_handler_post_from_isr, &sem));
+
+    xSemaphoreTake(sem, portMAX_DELAY);
+
+    TEST_TEARDOWN();
+}
+#endif
+
 #ifdef CONFIG_EVENT_LOOP_PROFILING
 TEST_CASE("can dump event loop profile", "[event]")
 {