From 2f4948ec62683c86c824fc78198279991deaa4ff Mon Sep 17 00:00:00 2001
From: Mark Haslinghuis <mark@numloq.nl>
Date: Tue, 19 Sep 2023 22:52:04 +0200
Subject: [PATCH] Revert "Allow for F7 UART idle preamble to be sent on startup
 - 4.4-maintenance (#13022)"

This reverts commit c51762dd96511c36cac21b8e616cb32d2dc1389e.
---
 src/main/drivers/serial_uart_stm32f7xx.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/main/drivers/serial_uart_stm32f7xx.c b/src/main/drivers/serial_uart_stm32f7xx.c
index 3782dd43bad..e8ae7ab8500 100644
--- a/src/main/drivers/serial_uart_stm32f7xx.c
+++ b/src/main/drivers/serial_uart_stm32f7xx.c
@@ -377,9 +377,9 @@ uartPort_t *serialUART(UARTDevice_e device, uint32_t baudRate, portMode_e mode,
             IOInit(txIO, OWNER_SERIAL_TX, RESOURCE_INDEX(device));
 
             if ((options & SERIAL_INVERTED) == SERIAL_NOT_INVERTED) {
-                uartdev->txPinState = TX_PIN_MONITOR;
-                // Switch TX to UART output whilst UART sends idle preamble
-                checkUsartTxOutput(s);
+                uartdev->txPinState = TX_PIN_ACTIVE;
+                // Switch TX to an input with pullup so it's state can be monitored
+                uartTxMonitor(s);
             } else {
                 IOConfigGPIOAF(txIO, IOCFG_AF_PP, uartdev->tx.af);
             }