[drivers]serial.c

HubertXie · Guozhanxin · commit 0fc7158ffbda · 2021-07-01T14:21:06.000+08:00
解决STM32串口使用DMA接收方式时，清空缓存bug
diff --git a/components/drivers/serial/serial.c b/components/drivers/serial/serial.c
@@ -955,9 +955,7 @@ static void _tc_flush(struct rt_serial_device *serial, int queue)
             {
                 RT_ASSERT(RT_NULL != rx_fifo);
                 level = rt_hw_interrupt_disable();
-                rt_memset(rx_fifo->buffer, 0, serial->config.bufsz);
-                rx_fifo->put_index = 0;
-                rx_fifo->get_index = 0;
+                rx_fifo->get_index = rx_fifo->put_index;
                 rx_fifo->is_full = RT_FALSE;
                 rt_hw_interrupt_enable(level);
             }

Original file line number	Diff line number	Diff line change
`@@ -955,9 +955,7 @@ static void _tc_flush(struct rt_serial_device *serial, int queue)`
`955`	`955`	`{`
`956`	`956`	`RT_ASSERT(RT_NULL != rx_fifo);`
`957`	`957`	`level = rt_hw_interrupt_disable();`
`958`		`- rt_memset(rx_fifo->buffer, 0, serial->config.bufsz);`
`959`		`- rx_fifo->put_index = 0;`
`960`		`- rx_fifo->get_index = 0;`
	`958`	`+ rx_fifo->get_index = rx_fifo->put_index;`
`961`	`959`	`rx_fifo->is_full = RT_FALSE;`
`962`	`960`	`rt_hw_interrupt_enable(level);`
`963`	`961`	`}`