Merge pull request #600 from UncleRus/fix/mcp23017-example

fix: fix example for mcp23017

examples/mcp23x17/mcp23017/main/main.c

@@ -1,19 +1,40 @@
-#include <stdio.h>
+#include <esp_log.h>
 #include <freertos/FreeRTOS.h>
 #include <freertos/task.h>
+#include <freertos/event_groups.h>
 #include <mcp23x17.h>
 #include <driver/gpio.h>
-#include <string.h>
+
+static const char *TAG = "mcp23017_example";
+
+static EventGroupHandle_t eg = NULL;
+static mcp23x17_t dev = { 0 };
+
+#define BIT_BUTTON_CHANGED BIT(0)
 
 static void IRAM_ATTR intr_handler(void *arg)
 {
-    printf("Interrupt!\n");
+    // On interrupt set bit in event group
+    BaseType_t hp_task;
+    if (xEventGroupSetBitsFromISR(eg, BIT_BUTTON_CHANGED, &hp_task) != pdFAIL)
+        portYIELD_FROM_ISR(hp_task);
+}
+
+void button_handler(void *pvParameters)
+{
+    while (1)
+    {
+        // wait for BIT_BUTTON_CHANGED, clear it on exit
+        if (xEventGroupWaitBits(eg, BIT_BUTTON_CHANGED, pdTRUE, pdTRUE, portMAX_DELAY) != BIT_BUTTON_CHANGED)
+            continue;
+        // OK, we got this bit set
+        ESP_LOGI(TAG, "Button was pressed!");
+    }
 }
 
 void test(void *pvParameters)
 {
-    mcp23x17_t dev;
-    memset(&dev, 0, sizeof(mcp23x17_t));
+    eg = xEventGroupCreate();
 
     ESP_ERROR_CHECK(mcp23x17_init_desc(&dev, CONFIG_EXAMPLE_I2C_ADDR, 0, CONFIG_EXAMPLE_I2C_MASTER_SDA, CONFIG_EXAMPLE_I2C_MASTER_SCL));
 
@@ -22,6 +43,10 @@ void test(void *pvParameters)
     // Setup interrupt on it
     mcp23x17_set_interrupt(&dev, 0, MCP23X17_INT_ANY_EDGE);
 
+    // Run button handler
+    xTaskCreate(button_handler, "button_handler", 4096, NULL, 5, NULL);
+
+    // Setup GPIO interrupt
     gpio_set_direction(CONFIG_EXAMPLE_INTA_GPIO, GPIO_MODE_INPUT);
     gpio_set_intr_type(CONFIG_EXAMPLE_INTA_GPIO, GPIO_INTR_ANYEDGE);
     gpio_install_isr_service(0);
@@ -44,4 +69,3 @@ void app_main()
     ESP_ERROR_CHECK(i2cdev_init());
     xTaskCreate(test, "test", configMINIMAL_STACK_SIZE * 6, NULL, 5, NULL);
 }
-