1.修改串口和SPI设备重置缓冲区操作，从close更改至open。

device/serial.c

@@ -41,6 +41,10 @@ static mr_err_t mr_serial_open(mr_device_t device)
 {
     mr_serial_t serial = (mr_serial_t)device;
 
+    /* Reset fifo */
+    mr_rb_reset(&serial->rx_fifo);
+    mr_rb_reset(&serial->tx_fifo);
+
     return serial->ops->configure(serial, &serial->config);
 }
 
@@ -49,10 +53,6 @@ static mr_err_t mr_serial_close(mr_device_t device)
     mr_serial_t serial = (mr_serial_t)device;
     struct mr_serial_config config = {0};
 
-    /* Reset fifo */
-    mr_rb_reset(&serial->rx_fifo);
-    mr_rb_reset(&serial->tx_fifo);
-
     return serial->ops->configure(serial, &config);
 }
 

device/spi.c

@@ -349,6 +349,10 @@ static mr_err_t mr_spi_device_open(mr_device_t device)
 {
     mr_spi_device_t spi_device = (mr_spi_device_t)device;
 
+    /* Reset fifo */
+    mr_rb_reset(&spi_device->rx_fifo);
+    mr_rb_reset(&spi_device->tx_fifo);
+
     return mr_spi_device_configure_cs(spi_device, MR_ENABLE);
 }
 
@@ -356,10 +360,6 @@ static mr_err_t mr_spi_device_close(mr_device_t device)
 {
     mr_spi_device_t spi_device = (mr_spi_device_t)device;
 
-    /* Reset fifo */
-    mr_rb_reset(&spi_device->rx_fifo);
-    mr_rb_reset(&spi_device->tx_fifo);
-
     return mr_spi_device_configure_cs(spi_device, MR_DISABLE);
 }