From 27476815ab77432c14342933f3f3d64d66122321 Mon Sep 17 00:00:00 2001
From: "Earle F. Philhower, III" <earlephilhower@yahoo.com>
Date: Wed, 16 Jun 2021 08:25:24 -0700
Subject: [PATCH] Fix SerialUART flush (#215)

Serial1.flush/Serial2.flush was not waiting for the proper FIFO to clear.
Use the proper call from the Pico SDK.

Thanks to Peter Remias for noting it.
---
 cores/rp2040/SerialUART.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cores/rp2040/SerialUART.cpp b/cores/rp2040/SerialUART.cpp
index 0af70afe..ba8d183f 100644
--- a/cores/rp2040/SerialUART.cpp
+++ b/cores/rp2040/SerialUART.cpp
@@ -161,7 +161,7 @@ void SerialUART::flush() {
     if (!_running || !m) {
         return;
     }
-    uart_default_tx_wait_blocking();
+    uart_tx_wait_blocking(_uart);
 }
 
 size_t SerialUART::write(uint8_t c) {