Fix uart TX flushing (#2029)

wait for FSM to return idle
espressif · Nov 19, 2018 · 44ca2ee · 44ca2ee
1 parent af79e18
commit 44ca2ee
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/cores/esp32/esp32-hal-uart.c b/cores/esp32/esp32-hal-uart.c
@@ -333,7 +333,7 @@ void uartFlush(uart_t* uart)
     }
 
     UART_MUTEX_LOCK();
-    while(uart->dev->status.txfifo_cnt);
+    while(uart->dev->status.txfifo_cnt || uart->dev->status.st_utx_out);
 
     //Due to hardware issue, we can not use fifo_rst to reset uart fifo.
     //See description about UART_TXFIFO_RST and UART_RXFIFO_RST in <<esp32_technical_reference_manual>> v2.6 or later.