From e46710d75621a2117ae5ddaad7e38d88e6abfaac Mon Sep 17 00:00:00 2001
From: Larry Bernstone <lbernstone@gmail.com>
Date: Tue, 24 Nov 2020 08:31:02 -0700
Subject: [PATCH] Fix possible race condition in uart attach

---
 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 3571042bb0c..1cf8d2a9d9d 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)