完善串口 V2 框架 (#5720)

* [stm32] fix h7 uart V2 driver unused code.
* [DeviceDriver][serialv2] fix the serialv2 when using for console device on DMA mode.
* [stm32][art-pi] using serial v2 by default

1 files changed, 10 insertions, 4 deletions

diff --git a/components/drivers/serial/serial_v2.c b/components/drivers/serial/serial_v2.c
index 404e7abae9..7a7a04de35 100644
--- a/components/drivers/serial/serial_v2.c
+++ b/components/drivers/serial/serial_v2.c
@@ -484,21 +484,27 @@ static rt_size_t _serial_fifo_tx_blocking_buf(struct rt_device        *dev,
 {
     struct rt_serial_device *serial;
     struct rt_serial_tx_fifo *tx_fifo = RT_NULL;
+    rt_size_t length = size;
+    rt_size_t offset = 0;
 
-    RT_ASSERT(dev != RT_NULL);
     if (size == 0) return 0;
 
+    RT_ASSERT(dev != RT_NULL);
     serial = (struct rt_serial_device *)dev;
     RT_ASSERT((serial != RT_NULL) && (buffer != RT_NULL));
+
     tx_fifo = (struct rt_serial_tx_fifo *) serial->serial_tx;
     RT_ASSERT(tx_fifo != RT_NULL);
+
+    if (rt_thread_self() == RT_NULL || (serial->parent.open_flag & RT_DEVICE_FLAG_STREAM))
+    {
+        /* using poll tx when the scheduler not startup or in stream mode */
+        return _serial_poll_tx(dev, pos, buffer, size);
+    }
     /* When serial transmit in tx_blocking mode,
      * if the activated mode is RT_TRUE, it will return directly */
     if (tx_fifo->activated == RT_TRUE)  return 0;
-
     tx_fifo->activated = RT_TRUE;
-    rt_size_t length = size;
-    rt_size_t offset = 0;
 
     while (size)
     {