From 6db2fc55b4472fcb6a8669e09478b0890eacfbcd Mon Sep 17 00:00:00 2001
From: Sergey <sergey@terentiev.me>
Date: Wed, 27 Oct 2021 14:08:03 +0300
Subject: [PATCH] UART PIN for nano-s 1.3

---
 .../src/pins/stm32f4/pins_MKS_ROBIN_NANO_V1_3_F4.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V1_3_F4.h b/Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V1_3_F4.h
index 05fd32f19b..17d32b2113 100644
--- a/Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V1_3_F4.h
+++ b/Marlin/src/pins/stm32f4/pins_MKS_ROBIN_NANO_V1_3_F4.h
@@ -96,3 +96,17 @@
 #ifndef XPT2046_Y_OFFSET
   #define XPT2046_Y_OFFSET                  349
 #endif
+
+#if HAS_TMC220x
+  /**
+   * TMC2208/TMC2209 stepper drivers
+   */
+  //
+  // Software serial
+  //
+  #define E0_SERIAL_TX_PIN                  PC14
+  #define E0_SERIAL_RX_PIN                  PC14
+
+  // Reduce baud rate to improve software serial reliability
+  #define TMC_BAUD_RATE 19200
+#endif