From eebab93358427b3b95b4d38dedbbb8aaaba977b8 Mon Sep 17 00:00:00 2001
From: Katelyn Schiesser <katelyn.schiesser@gmail.com>
Date: Sun, 18 Jul 2021 18:24:27 -0700
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20Ensure=20Software=20SPI=20pins?=
 =?UTF-8?q?=20for=20Max=20Thermocouple=20(#22389)?=
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---
 Marlin/src/module/temperature.cpp | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/Marlin/src/module/temperature.cpp b/Marlin/src/module/temperature.cpp
index 3959c402ae2b..4a94a5260c98 100644
--- a/Marlin/src/module/temperature.cpp
+++ b/Marlin/src/module/temperature.cpp
@@ -107,6 +107,24 @@
 #if (TEMP_SENSOR_0_USES_SW_SPI || TEMP_SENSOR_1_USES_SW_SPI) && !HAS_MAXTC_LIBRARIES
   #include "../libs/private_spi.h"
   #define HAS_MAXTC_SW_SPI 1
+
+  // Define pins for SPI-based sensors
+  #if TEMP_SENSOR_0_USES_SW_SPI
+    #define SW_SPI_SCK_PIN    TEMP_0_SCK_PIN
+    #define SW_SPI_MISO_PIN   TEMP_0_MISO_PIN
+    #if PIN_EXISTS(TEMP_0_MOSI)
+      #define SW_SPI_MOSI_PIN TEMP_0_MOSI_PIN
+    #endif
+  #else
+    #define SW_SPI_SCK_PIN    TEMP_1_SCK_PIN
+    #define SW_SPI_MISO_PIN   TEMP_1_MISO_PIN
+    #if PIN_EXISTS(TEMP_1_MOSI)
+      #define SW_SPI_MOSI_PIN TEMP_1_MOSI_PIN
+    #endif
+  #endif
+  #ifndef SW_SPI_MOSI_PIN
+    #define SW_SPI_MOSI_PIN   SD_MOSI_PIN
+  #endif
 #endif
 
 #if ENABLED(PID_EXTRUSION_SCALING)
@@ -198,7 +216,8 @@ const char str_t_thermal_runaway[] PROGMEM = STR_T_THERMAL_RUNAWAY,
     // Initialize SoftSPI for non-lib Software SPI; Libraries take care of it themselves.
     template<uint8_t MisoPin, uint8_t MosiPin, uint8_t SckPin>
       SoftSPI<MisoPin, MosiPin, SckPin> SPIclass<MisoPin, MosiPin, SckPin>::softSPI;
-    SPIclass<TEMP_0_MISO_PIN, TEMP_0_MOSI_PIN, TEMP_0_SCK_PIN> max_tc_spi;
+    SPIclass<SW_SPI_MISO_PIN, SW_SPI_MOSI_PIN, SW_SPI_SCK_PIN> max_tc_spi;
+
   #endif
 
   #define MAXTC_INIT(n, M) \