add stm32wl5e platform and wio-e5 variant (#1631)

Co-authored-by: Peter Lawrence <12226419+majbthrd@users.noreply.github.com>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

variants/wio-e5/platformio.ini

@@ -0,0 +1,4 @@
+[env:wio-e5]
+extends = stm32wl5e_base
+build_flags = ${stm32wl5e_base.build_flags} -Ivariants/wio-e5 -DHAL_DAC_MODULE_ONLY
+  -DSERIAL_UART_INSTANCE=1 -DPIN_SERIAL_RX=PB7 -DPIN_SERIAL_TX=PB6

variants/wio-e5/variant.h

@@ -0,0 +1,29 @@
+/*
+Wio-E5 mini (formerly LoRa-E5 mini)
+https://www.seeedstudio.com/LoRa-E5-mini-STM32WLE5JC-p-4869.html
+https://www.seeedstudio.com/LoRa-E5-Wireless-Module-p-4745.html
+*/
+
+/*
+This variant is a work in progress.
+Do not expect a working Meshtastic device with this target.
+*/
+
+#ifndef _VARIANT_WIOE5_
+#define _VARIANT_WIOE5_
+
+//Arduino/PlatformIO support for SUBGHZSPI is not currently available
+//#define USE_SX1262
+
+#ifdef USE_SX1262
+    #define HAS_RADIO 1
+
+    /* module only transmits through RFO_HP */
+    #define SX126X_RXEN PA5
+    #define SX126X_TXEN PA4
+
+    /* TCXO fed by internal LDO option behind PB0 pin */
+    #define SX126X_E22
+#endif
+
+#endif