diff --git a/components/driver/include/driver/uart.h b/components/driver/include/driver/uart.h
index dee41a171..9bd35e435 100644
--- a/components/driver/include/driver/uart.h
+++ b/components/driver/include/driver/uart.h
@@ -474,6 +474,8 @@ esp_err_t uart_intr_config(uart_port_t uart_num, const uart_intr_config_t *intr_
  * @param rx_buffer_size UART RX ring buffer size, rx_buffer_size should be greater than UART_FIFO_LEN.
  * @param tx_buffer_size UART TX ring buffer size.
  *        If set to zero, driver will not use TX buffer, TX function will block task until all data have been sent out..
+ *        @note tx_buffer_size should be greater than UART_FIFO_LEN.
+ *
  * @param queue_size UART event queue size/depth.
  * @param uart_queue UART event queue handle (out param). On success, a new queue handle is written here to provide
  *        access to UART events. If set to NULL, driver will not use an event queue.
diff --git a/components/driver/uart.c b/components/driver/uart.c
index 3787e05c9..30c3b7e57 100644
--- a/components/driver/uart.c
+++ b/components/driver/uart.c
@@ -191,7 +191,7 @@ esp_err_t uart_get_baudrate(uart_port_t uart_num, uint32_t* baudrate)
 esp_err_t uart_set_line_inverse(uart_port_t uart_num, uint32_t inverse_mask)
 {
     UART_CHECK((uart_num < UART_NUM_MAX), "uart_num error", ESP_FAIL);
-    UART_CHECK((((inverse_mask & ~UART_LINE_INV_MASK) == 0) && (inverse_mask != 0)), "inverse_mask error", ESP_FAIL);
+    UART_CHECK((((inverse_mask & ~UART_LINE_INV_MASK) == 0) || (inverse_mask == 0)), "inverse_mask error", ESP_FAIL);
     UART_ENTER_CRITICAL(&uart_spinlock[uart_num]);
     CLEAR_PERI_REG_MASK(UART_CONF0_REG(uart_num), UART_LINE_INV_MASK);
     SET_PERI_REG_MASK(UART_CONF0_REG(uart_num), inverse_mask);
@@ -970,6 +970,7 @@ esp_err_t uart_driver_install(uart_port_t uart_num, int rx_buffer_size, int tx_b
 {
     UART_CHECK((uart_num < UART_NUM_MAX), "uart_num error", ESP_FAIL);
     UART_CHECK((rx_buffer_size > UART_FIFO_LEN), "uart rx buffer length error(>128)", ESP_FAIL);
+    UART_CHECK((tx_buffer_size > UART_FIFO_LEN) || (tx_buffer_size == 0), "uart tx buffer length error(>128 or 0)", ESP_FAIL);
     if(p_uart_obj[uart_num] == NULL) {
         p_uart_obj[uart_num] = (uart_obj_t*) malloc(sizeof(uart_obj_t));
         if(p_uart_obj[uart_num] == NULL) {