Merge branch 'feat/sdio_example_without_intr' into 'master'

sdio: update the host example to support working with a slave without DAT1

See merge request espressif/esp-idf!7098

examples/peripherals/sdio/host/main/Kconfig.projbuild

@@ -32,6 +32,17 @@ menu "Example Configuration"
 
             If the example does not work, please try disabling the HS mode.
 
+    config EXAMPLE_NO_INTR_LINE
+        bool "The host is not connected to the interrupt line (DAT1) of slave"
+        default n
+        help
+            If this is set, the host example will not check the interrupt line but poll slave
+            registers to see whether the slave has interrupts for the host.
+
+            Working without the interrupt line may increase the CPU load of the host, and do harm
+            to the response speed to slave events, though can save 1 GPIO for other purposes in
+            non-4-bit mode.
+
     choice EXAMPLE_SLAVE
         prompt "GPIO to control slave EN in Espressif master-slave board."
         default EXAMPLE_SLAVE_NONE

examples/peripherals/sdio/host/main/app_main.c

@@ -293,22 +293,34 @@ void slave_power_on(void)
 
 DMA_ATTR uint8_t rcv_buffer[READ_BUFFER_LEN];
 
+static esp_err_t get_intr(essl_handle_t handle, uint32_t* out_raw, uint32_t* out_st)
+{
+    esp_err_t ret = ESP_OK;
+#ifndef CONFIG_EXAMPLE_NO_INTR_LINE
+    ret = essl_wait_int(handle, 0);
+    if (ret != ESP_OK) {
+        return ret;
+    }
+#endif
+
+    ret = essl_get_intr(handle, out_raw, out_st, TIMEOUT_MAX);
+    if (ret != ESP_OK) return ret;
+    ret = essl_clear_intr(handle, *out_raw, TIMEOUT_MAX);
+    if (ret != ESP_OK) return ret;
+    ESP_LOGD(TAG, "intr: %08X", *out_raw);
+    return ESP_OK;
+}
+
 //try to get an interrupt from the slave and handle it, return if none.
 esp_err_t process_event(essl_handle_t handle)
 {
-    esp_err_t ret = essl_wait_int(handle, 0);
+    uint32_t intr_raw, intr_st;
+    esp_err_t ret = get_intr(handle, &intr_raw, &intr_st);
     if (ret == ESP_ERR_TIMEOUT) {
         return ret;
     }
     ESP_ERROR_CHECK(ret);
 
-    uint32_t intr_raw, intr_st;
-    ret = essl_get_intr(handle, &intr_raw, &intr_st, TIMEOUT_MAX);
-    ESP_ERROR_CHECK(ret);
-    ret = essl_clear_intr(handle, intr_raw, TIMEOUT_MAX);
-    ESP_ERROR_CHECK(ret);
-    ESP_LOGD(TAG, "intr: %08X", intr_raw);
-
     for (int i = 0; i < 8; i++) {
         if (intr_raw & BIT(i)) {
             ESP_LOGI(TAG, "host int: %d", i);