From c1b06cc1205adcc9a94b8163ad76f14488fc79cc Mon Sep 17 00:00:00 2001
From: lbernstone <lbernstone@gmail.com>
Date: Tue, 1 Dec 2020 07:36:44 -0700
Subject: [PATCH] Fix possible race condition in uart attach (#4569)

---
 cores/esp32/esp32-hal-uart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cores/esp32/esp32-hal-uart.c b/cores/esp32/esp32-hal-uart.c
index 3571042b..1cf8d2a9 100644
--- a/cores/esp32/esp32-hal-uart.c
+++ b/cores/esp32/esp32-hal-uart.c
@@ -185,8 +185,8 @@ void uartAttachRx(uart_t* uart, uint8_t rxPin, bool inverted)
         return;
     }
     pinMode(rxPin, INPUT);
-    pinMatrixInAttach(rxPin, UART_RXD_IDX(uart->num), inverted);
     uartEnableInterrupt(uart);
+    pinMatrixInAttach(rxPin, UART_RXD_IDX(uart->num), inverted);
 }
 
 void uartAttachTx(uart_t* uart, uint8_t txPin, bool inverted)