remove FreeRTOS dependency from STM32 build; disable debugging to preserve FLASH space

LittleFS mutex routines are stubs and malloc()/free() are the stdlib
versions

arch/stm32/stm32.ini

@@ -9,7 +9,6 @@ build_type = release
 
 build_flags =
   ${arduino_base.build_flags}
-  -Wl,--undefined=vTaskSwitchContext
   -flto
   -Isrc/platform/stm32wl -g
   -DMESHTASTIC_EXCLUDE_ENVIRONMENTAL_SENSOR
@@ -21,7 +20,7 @@ build_flags =
   -DMESHTASTIC_EXCLUDE_BLUETOOTH
   -DMESHTASTIC_EXCLUDE_PKI
   -DMESHTASTIC_EXCLUDE_GPS
-  -DconfigUSE_CMSIS_RTOS_V2=1
+  -DDEBUG_MUTE
   -fmerge-all-constants
   -ffunction-sections
   -fdata-sections
@@ -31,11 +30,11 @@ build_src_filter =
 
 board_upload.offset_address = 0x08000000
 upload_protocol = stlink
+debug_tool = stlink
 
 lib_deps =
   ${env.lib_deps}
   ${radiolib_base.lib_deps}
-  stm32duino/STM32duino FreeRTOS@^10.3.2
   https://github.com/caveman99/Crypto.git#eae9c768054118a9399690f8af202853d1ae8516
 
 lib_ignore =

src/freertosinc.h

@@ -12,7 +12,7 @@
 #include <freertos/task.h>
 #endif
 
-#if defined(ARDUINO_NRF52_ADAFRUIT) || defined(ARDUINO_ARCH_RP2040) || defined(STM32WLE5xx)
+#if defined(ARDUINO_NRF52_ADAFRUIT) || defined(ARDUINO_ARCH_RP2040)
 #define HAS_FREE_RTOS
 
 #include <FreeRTOS.h>

src/platform/stm32wl/STM32_LittleFS.cpp

@@ -42,7 +42,6 @@ STM32_LittleFS::STM32_LittleFS(struct lfs_config *cfg)
     varclr(&_lfs);
     _lfs_cfg = cfg;
     _mounted = false;
-    _mutex = xSemaphoreCreateMutexStatic(&this->_MutexStorageSpace);
 }
 
 STM32_LittleFS::~STM32_LittleFS() {}

src/platform/stm32wl/STM32_LittleFS.h

@@ -76,17 +76,13 @@ class STM32_LittleFS
      * code. User should not call these directly
      *------------------------------------------------------------------*/
     lfs_t *_getFS(void) { return &_lfs; }
-    void _lockFS(void) { xSemaphoreTake(_mutex, portMAX_DELAY); }
-    void _unlockFS(void) { xSemaphoreGive(_mutex); }
+    void _lockFS(void) { /* no-op */ }
+    void _unlockFS(void) { /* no-op */ }
 
   protected:
     bool _mounted;
     struct lfs_config *_lfs_cfg;
     lfs_t _lfs;
-    SemaphoreHandle_t _mutex;
-
-  private:
-    StaticSemaphore_t _MutexStorageSpace;
 };
 
 #if !CFG_DEBUG

src/platform/stm32wl/littlefs/lfs_util.h

@@ -174,8 +174,7 @@ void lfs_crc(uint32_t *crc, const void *buffer, size_t size);
 static inline void *lfs_malloc(size_t size)
 {
 #ifndef LFS_NO_MALLOC
-    extern void *pvPortMalloc(size_t xWantedSize);
-    return pvPortMalloc(size);
+    return malloc(size);
 #else
     (void)size;
     return NULL;
@@ -186,8 +185,7 @@ static inline void *lfs_malloc(size_t size)
 static inline void lfs_free(void *p)
 {
 #ifndef LFS_NO_MALLOC
-    extern void vPortFree(void *pv);
-    vPortFree(p);
+    free(p);
 #else
     (void)p;
 #endif

variants/wio-e5/platformio.ini

@@ -21,6 +21,8 @@ build_flags =
   -DMESHTASTIC_EXCLUDE_SCREEN=1
   -DMESHTASTIC_EXCLUDE_MQTT=1
   -DMESHTASTIC_EXCLUDE_POWERMON=1
-  -DPIO_FRAMEWORK_ARDUINO_NANOLIB_FLOAT_PRINTF
+  -DMESHTASTIC_EXCLUDE_PKI
+  ;-DPIO_FRAMEWORK_ARDUINO_NANOLIB_FLOAT_PRINTF
+  ;-DCFG_DEBUG
 
 upload_port = stlink