feat: support STM32WL family

Fixes #44

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

src/port.c

@@ -23,13 +23,18 @@
 #endif
 
 #if (__CORTEX_M == 4U)
+#if (__FPU_PRESENT == 0)
+/* Fallback to CM3 port as there is no FPU */
+#include "../portable/GCC/ARM_CM3/port.c"
+#else
 /* MPU not supported */
 #if 0 /*(__MPU_PRESENT == 1)*/
 #include "../portable/GCC/ARM_CM4_MPU/port.c"
 #else
 #include "../portable/GCC/ARM_CM4F/port.c"
 #endif
 #endif
+#endif
 
 #if (__CORTEX_M == 7U)
 /* MPU not supported */

src/portmacro.h

@@ -28,13 +28,18 @@ inline __attribute__(( always_inline )) static BaseType_t xPortIsInsideInterrupt
 #endif
 
 #if (__CORTEX_M == 4U)
+#if (__FPU_PRESENT == 0)
+/* Fallback to CM3 port as there is no FPU */
+#include "../portable/GCC/ARM_CM3/portmacro.h"
+#else
 /* MPU not supported */
 #if 0 /*(__MPU_PRESENT == 1)*/
 #include "../portable/GCC/ARM_CM4_MPU/portmacro.h"
 #else
 #include "../portable/GCC/ARM_CM4F/portmacro.h"
 #endif
 #endif
+#endif
 
 #if (__CORTEX_M == 7U)
 /* MPU not supported */