From 75c863c8f6dffabcc09437348ebf490c16a2ab00 Mon Sep 17 00:00:00 2001
From: soypat <graded.sp@gmail.com>
Date: Sat, 11 Mar 2023 10:36:53 -0300
Subject: [PATCH] add Flush for UART

---
 src/machine/machine_rp2040_uart.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/machine/machine_rp2040_uart.go b/src/machine/machine_rp2040_uart.go
index b4053aeb92..713cd863f8 100644
--- a/src/machine/machine_rp2040_uart.go
+++ b/src/machine/machine_rp2040_uart.go
@@ -131,3 +131,9 @@ func (uart *UART) handleInterrupt(interrupt.Interrupt) {
 	}
 	uart.Receive(byte((uart.Bus.UARTDR.Get() & 0xFF)))
 }
+
+// Flush blocks until all bytes in UART transmit buffer have been sent over the wire.
+func (uart *UART) Flush() {
+	for uart.Bus.UARTFR.HasBits(rp.UART0_UARTFR_BUSY) {
+	}
+}