feat(vfs): modify vfs for ESP8266

components/esp8266/include/driver/uart.h

@@ -20,6 +20,7 @@
 extern "C" {
 #endif
 
+#include <stdbool.h>
 #include "esp_err.h"
 #include "esp_log.h"
 #include "freertos/queue.h"
@@ -553,6 +554,17 @@ esp_err_t uart_get_buffered_data_len(uart_port_t uart_num, size_t *size);
  */
 esp_err_t uart_set_rx_timeout(uart_port_t uart_num, const uint8_t tout_thresh);
 
+/**
+ * @brief Checks whether the driver is installed or not
+ *
+ * @param uart_num UART port number, the max port number is (UART_NUM_MAX -1).
+ *
+ * @return
+ *     - true  driver is installed
+ *     - false driver is not installed
+ */
+bool uart_is_driver_installed(uart_port_t uart_num);
+
 #ifdef __cplusplus
 }
 #endif