switch to using QSPI bus for external flash

variants/thinknode_m1/platformio.ini

@@ -80,6 +80,7 @@ build_flags =
   -D OFFLINE_QUEUE_SIZE=256
   -D PIN_BUZZER=6
   -D AUTO_SHUTDOWN_MILLIVOLTS=3300
+  -D QSPIFLASH=1
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
 build_src_filter = ${ThinkNode_M1.build_src_filter}

variants/thinknode_m1/variant.h

@@ -110,6 +110,15 @@ extern const int MISO;
 extern const int MOSI;
 extern const int SCK;
 
+////////////////////////////////////////////////////////////////////////////////
+// QSPI
+#define PIN_QSPI_SCK (46)
+#define PIN_QSPI_CS  (47)
+#define PIN_QSPI_IO0 (44)  // MOSI if using two bit interface
+#define PIN_QSPI_IO1 (45)  // MISO if using two bit interface
+#define PIN_QSPI_IO2 (7)   // WP if using two bit interface (i.e. not used)
+#define PIN_QSPI_IO3 (5)   // HOLD if using two bit interface (i.e. not used)
+
 ////////////////////////////////////////////////////////////////////////////////
 // Display